WO2025100313A1 - X-ray fluoroscopic imaging device - Google Patents

Abstract

An X-ray fluoroscopic imaging device (100) comprises a control unit (6) that performs control for causing irradiation of X-rays by an X-ray irradiation unit (21) on the basis of an input operation of an operation unit (3), and performs control for generating an X-ray image. The control unit (6) is configured such that when the pixel value of a pixel included in the generated X-ray image is included in the range of a target pixel value (58), the X-ray irradiation by the X-ray irradiation unit (21) is stopped even when reception of the input operation for causing irradiation of X-rays is continued by the operation unit (3).

Description

X-ray fluoroscopy equipment

The present invention relates to an X-ray fluoroscopy device.

　Conventionally, X-ray fluoroscopy devices that use X-rays to perform fluoroscopic imaging of a subject are known. Such an X-ray imaging device is disclosed, for example, in International Publication No. 2018/025347.

　International Publication No. WO 2018/025347 discloses that in an X-ray fluoroscopy apparatus, when X-ray fluoroscopy of a subject is started, the X-ray irradiation conditions are changed so that the luminance value (pixel value) of the X-ray image becomes an ideal luminance value (target pixel value) in order to display an X-ray image with appropriate luminance. This X-ray fluoroscopy apparatus automatically adjusts the above-mentioned X-ray irradiation conditions for X-ray images that are intermittently generated by X-ray fluoroscopy.

International Publication No. 2018/025347

Although not described in the above-mentioned International Publication No. 2018/025347, a typical X-ray fluoroscopy device is equipped with, for example, an X-ray fluoroscopy foot switch. When the X-ray fluoroscopy foot switch is depressed, X-rays are emitted from the X-ray irradiation unit, and X-ray fluoroscopy begins. When the foot is released from the depressed X-ray fluoroscopy foot switch, the X-ray irradiation from the X-ray irradiation unit is stopped, and X-ray fluoroscopy ends.

In the X-ray fluoroscopy apparatus of International Publication No. 2018/025347, if the time for which the X-ray fluoroscopy foot switch (operating unit) is pressed is shortened in order to reduce the amount of radiation exposure, an X-ray image with improved visibility may not be obtained because the brightness value (pixel value) of the X-ray image generated based on the changed X-ray irradiation conditions does not converge to the ideal brightness value (target pixel value). In contrast, if the time for which the X-ray fluoroscopy foot switch is pressed is lengthened in order to reliably obtain an X-ray image with improved visibility, the amount of radiation exposure of the subject may increase due to an increase in the X-ray irradiation time. Therefore, it is desirable to obtain an X-ray image with improved visibility while suppressing an increase in the amount of radiation exposure of the subject.

This invention has been made to solve the problems described above, and one object of the invention is to provide an X-ray fluoroscopy device that can obtain X-ray images with improved visibility while suppressing an increase in the amount of radiation exposure to the subject.

In one aspect of the present invention, the X-ray fluoroscopy device includes an X-ray irradiation unit that irradiates X-rays, an X-ray detection unit that detects the X-rays irradiated by the X-ray irradiation unit, an operation unit that accepts input operations related to the irradiation of X-rays by the X-ray irradiation unit, and a control unit that controls the irradiation of X-rays by the X-ray irradiation unit based on the input operation of the operation unit and controls the generation of an X-ray image based on a detection signal output from the X-ray detection unit, and the control unit is configured to stop the irradiation of X-rays by the X-ray irradiation unit when the pixel value of a pixel included in the generated X-ray image is within a range of target pixel values, even if the operation unit continues to accept the input operation to irradiate X-rays.

In the X-ray fluoroscopy apparatus according to the above aspect, as described above, the control unit is configured to stop the X-ray irradiation by the X-ray irradiation unit when the pixel value of a pixel included in the generated X-ray image is within the range of the target pixel value, even if the operation unit continues to accept an input operation to irradiate X-rays. As a result, even if the input operation to irradiate X-rays continues to be accepted, the X-ray irradiation by the X-ray irradiation unit is stopped when the pixel value of a pixel included in the generated X-ray image is within the range of the target pixel value. Therefore, it is possible to suppress the cancellation of the input operation for X-ray irradiation before the pixel value is included in the range of the target pixel value due to concerns about an increase in the subject's radiation exposure, and it is possible to suppress an increase in the X-ray irradiation time based on the continued acceptance of the input operation for X-ray irradiation when the pixel value is included in the range of the target pixel value. In addition, when the control unit stops the X-ray irradiation, the pixel value of the pixel included in the generated X-ray image is included in the range of the target pixel value, so that the visibility of the generated X-ray image can be improved. For these reasons, it is possible to obtain an X-ray image with improved visibility while suppressing an increase in the subject's radiation exposure.

1 is a block diagram showing a configuration of an X-ray fluoroscopic imaging apparatus according to a first embodiment; 1 is a schematic diagram of an X-ray fluoroscopic apparatus according to a first embodiment. 3 is a schematic diagram of a foot switch and an operation panel of the X-ray fluoroscopic apparatus according to the first embodiment. FIG. 2 is a schematic diagram of a display unit of the X-ray fluoroscopic imaging apparatus according to the first embodiment. FIG. FIG. 2 is a diagram illustrating an example of an APR according to the first embodiment. FIG. 11 is a sequence diagram for explaining feedback control using a first operation unit according to the first embodiment. FIG. 11 is a sequence diagram for explaining feedback control using a second operation unit according to the first embodiment. 5 is a first flowchart for explaining pixel value adjustment processing and X-ray image display processing according to the first embodiment. 11 is a second flowchart for explaining the pixel value adjustment process and the X-ray image display process according to the first embodiment. FIG. 11 is a block diagram showing the configuration of an X-ray fluoroscopic imaging apparatus according to a second embodiment. FIG. 11 is a schematic diagram of a foot switch and an operation panel of an X-ray fluoroscopic apparatus according to a second embodiment. 13 is a third flowchart for explaining the pixel value adjustment process and the X-ray image display process according to the second embodiment. 13 is a fourth flowchart for explaining the pixel value adjustment process and the X-ray image display process according to the second embodiment.

[First embodiment]
(Configuration of X-ray Fluoroscopy Device)
The configuration of an X-ray fluoroscopic imaging apparatus 100 according to the first embodiment will be described with reference to FIGS.

The X-ray fluoroscopy device 100 is an X-ray fluoroscopy device for taking X-rays when a doctor or the like performs a surgical procedure. As shown in Figures 1 and 2, the X-ray fluoroscopy device 100 comprises a device main body 1 and a monitor trolley 4. The entire X-ray fluoroscopy device 100 is movable, and is configured so that when a doctor or the like performs a procedure, it can be moved to a subject in an operating room to take X-rays. Note that X-ray photography includes fluoroscopy photography, which takes X-ray images as moving images, and general photography, which takes X-ray images as still images. Also, X-ray images include X-ray fluoroscopy images and general X-ray images.

As shown in FIG. 1, the device main body 1 includes an X-ray imaging unit 2, an operation unit 3, a memory unit 5, a control unit 6, a movement mechanism unit 7 (see FIG. 2), and an arm 8 (see FIG. 2). The X-ray imaging unit 2 includes an X-ray irradiation unit 21 and an X-ray detection unit 22. The monitor cart unit 4 includes a display unit 4a.

When the X-ray fluoroscopy device 100 images a subject, the subject (not shown) and a tabletop (not shown) on which the subject rests are placed are placed inside the arm 8 (see FIG. 2). The tabletop is the tabletop of a bed used by the subject in an operating room or the like.

As shown in FIG. 1, the X-ray irradiation unit 21 is configured to generate X-rays by applying a high voltage and to irradiate the generated X-rays toward the X-ray detection unit 22. The X-ray irradiation unit 21 includes, for example, an X-ray tube, which is an X-ray source, and a collimator that adjusts the irradiation range of the X-rays generated by the X-ray tube.

The X-ray detection unit 22 is configured to detect the X-rays irradiated by the X-ray irradiation unit 21. The X-ray detection unit 22 includes, for example, an FPD (Flat Panel Detector). The X-ray detection unit 22 transmits a detection signal, which is an electrical signal corresponding to the detected X-rays, to the image processing unit 61 described below. Note that the X-ray detection unit 22 may include an II (Image Intensifier) instead of an FPD.

The operation unit 3 is configured to receive input operations related to the irradiation of X-rays by the X-ray irradiation unit 21. The operation unit 3 includes a first operation unit 3a and a second operation unit 3b for performing fluoroscopic imaging. When an input operation for irradiating X-rays is received by the first operation unit 3a, if the pixel value of the generated X-ray image is within the range of the target pixel value 58 (see FIG. 5), the irradiation of X-rays by the X-ray irradiation unit 21 is stopped even if the input operation continues to be received. Also, when an input operation for irradiating X-rays is received by the second operation unit 3b, the irradiation of X-rays by the X-ray irradiation unit 21 is not stopped even if the pixel value of the generated X-ray image is within the range of the target pixel value 58.

The operation unit 3 includes a foot switch 70 (see FIG. 3(a)) and an operation panel 33 (see FIG. 3(b)).

As shown in FIG. 3(a), the foot switch 70 includes a first foot switch 71 as the first operation unit 3a used for performing fluoroscopic imaging, a second foot switch 72 as the second operation unit 3b used for performing fluoroscopic imaging, and a third foot switch 73 used for performing general imaging. The foot switch 70 is configured to accept input operations related to the start and end of X-ray irradiation by the X-ray irradiation unit 21. When the first foot switch 71 or the second foot switch 72 is depressed, X-ray fluoroscopy is started by irradiating X-rays from the X-ray irradiation unit 21. When the foot is released from the depressed first foot switch 71 or second foot switch 72, X-ray irradiation from the X-ray irradiation unit 21 is stopped, and X-ray fluoroscopy is ended. While the first foot switch 71 or the second foot switch 72 is depressed, X-ray fluoroscopy continues, and X-ray images collected at a predetermined frame rate are displayed as a moving image on the display unit 4a. When an input operation to irradiate X-rays is received by the first foot switch 71, if the pixel value of the generated X-ray image is within the range of the target pixel value 58 (see FIG. 5), the X-ray irradiation unit 21 stops irradiating X-rays even if the input operation continues to be received. When the third foot switch 73 is pressed, X-rays are irradiated from the X-ray irradiation unit 21, and general imaging is performed. The foot switch 70 is connected to the device body via a cable 70a.

As shown in FIG. 3(b), the operation panel 33 is provided with a number of input sections 33a that accept input operations related to X-ray irradiation. The input sections 33a include an X-ray fluoroscopy button 36a and a target pixel value change button 37. The operation panel 33 may be configured, for example, as a touch panel type liquid crystal display that functions as an input section into which various operations are input. The operation panel 33 is provided in the movement mechanism section 7 (see FIG. 2).

The X-ray fluoroscopy button 36a includes a first X-ray fluoroscopy button 34 as the first operation unit 3a and a second X-ray fluoroscopy button 35 as the second operation unit 3b. The X-ray fluoroscopy button 36a is configured to accept input operations related to the start and end of X-ray irradiation by the X-ray irradiation unit 21. When the X-ray fluoroscopy button 36a is pressed, X-ray fluoroscopy is started by irradiating X-rays from the X-ray irradiation unit 21. When the X-ray fluoroscopy button 36a is released, X-ray irradiation from the X-ray irradiation unit 21 is stopped and X-ray fluoroscopy is ended. While the X-ray fluoroscopy button 36a is pressed, X-ray fluoroscopy continues and X-ray images collected at a predetermined frame rate are displayed as a video on the display unit 4a. In addition, when an input operation to irradiate X-rays is being accepted using the first X-ray fluoroscopy button 34, if the pixel value of the generated X-ray image is within the range of the target pixel value 58 (see FIG. 5), the X-ray irradiation unit 21 stops irradiating X-rays even if the input operation continues to be accepted.

The target pixel value change button 37 is configured to receive input operations related to changing the set target pixel value 58 described below. The target pixel value change button 37 includes a plus button 37a that gradually increases the brightness level of the X-ray image to be generated based on the brightness level of the X-ray image corresponding to the set target pixel value 58, and a minus button 37b that gradually decreases the brightness level of the X-ray image to be generated.

In other words, the set target pixel value 58 is changed to be larger based on the operation of the plus button 37a. By changing the set target pixel value 58 to be larger, the tube voltage 55 or tube current 56 included in the set X-ray irradiation condition 54 (see FIG. 5) is increased. This increases the brightness level of the generated X-ray image and increases the radiation exposure of the subject.

Furthermore, the set target pixel value 58 is changed to be smaller based on the operation of the minus button 37b. By changing the set target pixel value 58 to be smaller, the tube voltage 55 or tube current 56 included in the set X-ray irradiation condition 54 (see FIG. 5) is decreased. This lowers the brightness level of the generated X-ray image and reduces the amount of radiation exposure of the subject.

As shown in FIG. 1, the memory unit 5 includes a ROM (Read Only Memory) or a RAM (Random Access Memory). Various programs executed by the processor are stored in the memory unit 5. The memory unit 5 also stores X-ray images generated at a predetermined frame rate. The X-ray images stored in the memory unit 5 include images of multiple frames generated from the start of X-ray fluoroscopy to the end of X-ray fluoroscopy. The generated X-ray images are configured to be stored as still images or videos.

Also, as shown in FIG. 5, the memory unit 5 stores an APR (Anatomical Program) 50. The APR 50 is a program in which image acquisition conditions 52 are linked to each piece of body part information 51. The body part information 51 is information on the body part of the subject to be irradiated with X-rays, and examples include the head and neck, chest, abdomen, hip joints, shoulders, knees, and feet. The image acquisition conditions 52 are a series of conditions related to the acquisition of X-ray images, and include X-ray irradiation conditions 54 and image processing conditions 53.

The X-ray irradiation conditions 54 are various parameters related to X-ray irradiation. Examples of parameters related to X-ray irradiation include a tube voltage 55 and a tube current 56 applied to the X-ray tube. The image processing conditions 53 are parameters related to image processing performed on the detection signal, which is an electrical signal transmitted by the X-ray detection unit 22, and examples include a contrast processing value, a sharpening processing value, and an edge processing value. The image processing conditions 53 also include a frame rate 57.

The control unit 6 is configured with a processor such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an FPGA (Field-Programmable Gate Array), or an ASIC (Application Specific Integrated Circuit). The control unit 6 as hardware includes an image processing unit 61, an imaging control unit 60, and a display control unit 62 as software (program) functional blocks. The control unit 6 functions as the image processing unit 61, the imaging control unit 60, and the display control unit 62 by executing a program stored in the storage unit 5. The image processing unit 61, the imaging control unit 60, and the display control unit 62 may be configured individually as hardware by providing a dedicated processor (processing circuit).

The image processing unit 61 is configured to generate an X-ray image based on the detection signal output from the X-ray detection unit 22. The image processing unit 61 is configured to generate X-ray images sequentially. The image processing unit 61 is configured to generate X-ray images of the inside of the subject sequentially at a predetermined frame rate (for example, several fps to about 10 fps).

The image processing unit 61 is also configured to acquire the pixel value of each pixel included in the generated X-ray image. The image processing unit 61 is also configured to acquire the average, maximum, and minimum pixel values of each pixel in a specific region 59 (see FIG. 5) included in the generated X-ray image. The specific region 59 is a region that is set in advance in each part of the subject to be irradiated with X-rays, and is information included in the APR 50 (see FIG. 5). In the first embodiment, for example, the generated X-ray image is image data having pixel values of 4096 gradations (12 bits) from 0 to 4095. A pixel with a pixel value of the minimum gradation 0 has a display density of black, and a pixel with a pixel value of the maximum gradation 4095 has a display density of white.

The imaging control unit 60 is configured to control the X-ray irradiation unit 21 to irradiate X-rays based on the input operation of the operation unit 3. When the pixel value of a pixel included in the X-ray image generated by the image processing unit 61 is within the range of the target pixel value 58 (see FIG. 5), the imaging control unit 60 is configured to stop the irradiation of X-rays by the X-ray irradiation unit 21 even if the input operation to irradiate X-rays is still being accepted by the first operation unit 3a.

In addition, when the pixel values of the X-ray image generated by the image processing unit 61 are not within the range of the target pixel values 58 (see FIG. 5), the imaging control unit 60 is configured to change the set X-ray irradiation conditions 54 and cause the X-ray irradiation unit 21 to irradiate X-rays in order to adjust the pixel values of the pixels contained in the X-ray image.

Specifically, the imaging control unit 60 obtains the difference between the average, maximum, and minimum pixel values of each pixel in the specific region 59 obtained by the image processing unit 61 and the average, maximum, and minimum pixel values in the target pixel value 58. The imaging control unit 60 changes the set X-ray irradiation conditions 54 according to the obtained difference and causes the X-ray irradiation unit 21 to irradiate X-rays. The imaging control unit 60 performs feedback control to cause the X-ray irradiation unit 21 to irradiate X-rays by adjusting the tube voltage or tube current supplied to the X-ray tube, for example, so that the obtained difference approaches zero.

Alternatively, the imaging control unit 60 acquires the ratio of the average value, maximum value, and minimum value of the pixel value in the target pixel value 58 to the average value, maximum value, and minimum value of the pixel value of each pixel in the specific region 59 acquired by the image processing unit 61. The imaging control unit 60 changes the set X-ray irradiation conditions 54 according to the acquired ratio and causes the X-ray irradiation unit 21 to irradiate X-rays. For example, the imaging control unit 60 performs feedback control to adjust the tube voltage or tube current supplied to the X-ray tube so that the acquired ratio approaches 1 and causes the X-ray irradiation unit 21 to irradiate X-rays.

In addition, when the pixel values of the X-ray image generated by the image processing unit 61 based on the changed X-ray irradiation conditions 54 are within the range of the target pixel values 58, the imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 even if the first operation unit 3a continues to accept an input operation to irradiate X-rays.

In addition, the imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 when the pixel values in the multiple X-ray images that have been set are within the range of the target pixel value 58, even if the first operation unit 3a continues to accept an input operation to irradiate X-rays.

As an example, the imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 when the pixel values in five consecutive frames of X-ray images are within the range of the target pixel value 58, even if the first operation unit 3a continues to accept an input operation to irradiate X-rays. The set multiple X-ray images are not limited to five consecutive frames. For example, they may be two to four consecutive frames, or six or more consecutive frames. They may also be multiple non-consecutive X-ray images. In the first embodiment, the imaging control unit 60 causes the X-ray irradiation unit 21 to irradiate X-rays without changing the X-ray irradiation conditions 54 until the pixel values in the five consecutive frames of X-ray images are within the range of the target pixel value 58.

The display control unit 62 is configured to cause the display unit 4a to execute a display that enables the user to recognize that the X-ray irradiation by the X-ray irradiation unit 21 has been stopped, based on the fact that the pixel values in the multiple X-ray images are included within the range of the target pixel value 58, even if the first operation unit 3a continues to accept input operations to irradiate X-rays.

Specifically, the display control unit 62 is configured to cause the display unit 4a to execute a display that allows the user to recognize that the X-ray irradiation by the X-ray irradiation unit 21 has stopped by causing the display unit 4a to display in a recognizable manner that the last X-ray image from among the generated X-ray images when the X-ray irradiation was stopped is displayed on the display unit 4a as a recognizable display of the stop of X-ray irradiation by the X-ray irradiation unit 21. More specifically, based on the fact that the pixel values in the multiple X-ray images are included within the range of the target pixel value 58, the display control unit 62 causes the display unit 4a to display the last X-ray image from among the generated X-ray images when the X-ray irradiation was stopped (last image hold image) and a mark 41 (see FIG. 4 ) that allows the user to recognize that the X-ray image displayed on the display unit 4a is the last image hold image.

The moving mechanism 7 is configured to be movable while supporting the X-ray imaging unit 2 and the arm 8. The moving mechanism 7 is configured as a dolly for the X-ray fluoroscopy device 100. The moving mechanism 7 is also provided with a number of wheels 7a, an arm support 7b, and a connecting part 7c.

The multiple wheels 7a are provided on the lower part of the moving mechanism unit 7. This allows the X-ray fluoroscopy device 100 to be moved. In other words, the X-ray fluoroscopy device 100 is a mobile (portable) imaging device.

The arm support section 7b supports the arm 8 so that it can slide. The arm support section 7b is also disposed on the moving mechanism section 7 and is connected to a connecting section 7c that rotates the arm support section 7b together with the arm 8 and the like around a horizontal axis. The connecting section 7c rotates around a vertical axis relative to the moving mechanism section 7. Therefore, as the connecting section 7c rotates, the arm 8 rotates around the vertical axis together with the X-ray irradiation section 21 and the X-ray detection section 22.

The arm 8 holds an X-ray irradiation unit 21 at one end. The arm 8 holds an X-ray detection unit 22 at the other end. The arm 8 has a C-shape. The arm 8 is a so-called C-arm.

The monitor cart unit 4 includes a display unit 4a and multiple wheels 4b. The monitor cart unit 4 is configured to be movable by the multiple wheels 4b.

The display unit 4a is configured to display the X-ray image of the subject generated by the image processing unit 61. The display unit 4a includes, for example, a liquid crystal monitor. As shown in FIG. 4, the image display area 40 of the display unit 4a displays the X-ray image generated at a predetermined frame rate in real time as a moving image.

Also, as shown in FIG. 4, the last image hold image is displayed in the image display area 40 of the display unit 4a. When the last image hold image is displayed, a sign 41 indicating that it is the last image hold image is displayed recognizably on the display unit 4a in the image display area 40 of the display unit 4a. For example, "LIH" is displayed on the display unit 4a as the sign 41 indicating that it is the last image hold image.

The display unit 4a also displays a level image 42 indicating the brightness level of the X-ray image to be generated, based on the brightness level of the X-ray image corresponding to the set target pixel value 58. As an example, when the brightness of the X-ray image corresponding to the set target pixel value 58 is at the reference level, an image of "0" is displayed as shown in FIG. 4, when the brightness level of the X-ray image to be generated is increased by one level from the reference level, an image of "+1" is displayed, and when the brightness level of the X-ray image to be generated is decreased by one level from the reference level, an image of "-1" is displayed.

(Pixel value and target pixel value)
The pixel values include the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region 59 (see FIG. 5) included in the X-ray image generated by the image processing unit 61.

The target pixel value 58 is information included in the APR 50 (see FIG. 5). The target pixel value 58 includes the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region 59 set in each of the imaging sites of the subject. In addition, a specific range centered on the target pixel value 58 is set in advance as the range of the target pixel value 58. For example, a range that is included between plus and minus a few percent from the target pixel value 58 is set in advance as the range of the target pixel value 58. In addition, the set target pixel value 58 is configured to be changeable. Specifically, it is configured to be possible to change the level of the set target pixel value 58 to be higher or to be lower by using the target pixel value change button 37.

(First operation unit and second operation unit)
When an input operation for irradiating X-rays is accepted by the first operation unit 3a, if the pixel value of the generated X-ray image is included in the range of the target pixel value 58, the imaging control unit 60 is configured to stop the irradiation of X-rays by the X-ray irradiator 21 even if the input operation for irradiating X-rays is still being accepted by the first operation unit 3a. In this case, the image processing unit 61 is configured to stop the generation of the X-ray image.

In response to this, the imaging control unit 60 is configured not to stop the X-ray irradiation by the X-ray irradiation unit 21 when an input operation to irradiate X-rays is accepted by the second operation unit 3b, even if the pixel value of the generated X-ray image is included in the range of the target pixel value 58. In this case, the image processing unit 61 is also configured to generate an X-ray image.

The X-ray fluoroscopy device 100 of this embodiment is a surgical X-ray fluoroscopy device. Surgical X-ray fluoroscopy devices may be used in the field of orthopedics to check the embedding status of a bolt in the waist of a subject or the embedding status of a plate in the arm of a subject. In this case, the body thickness (thickness) is different between the waist and the arm. Therefore, in acquiring a last image hold image for confirmation, the surgical X-ray fluoroscopy device has a problem in that it is difficult to optimize the depression time of the foot switch due to the difference in body thickness (thickness) for each imaging part. By adopting the configuration of this embodiment, when the body thickness (thickness) is different for each imaging part, even if the input operation for irradiating X-rays continues to be accepted, the X-ray irradiation by the X-ray irradiation unit 21 is stopped when the pixel value of the pixel included in the generated X-ray image is within the range of the target pixel value 58. Therefore, it is possible to prevent the acceptance of the input operation for X-ray irradiation from being canceled before the pixel value falls within the range of the target pixel value 58 due to concerns about an increase in the subject's radiation exposure, and it is also possible to prevent an increase in the X-ray irradiation time due to the continuation of the acceptance of the input operation for X-ray irradiation when the pixel value falls within the range of the target pixel value 58. Therefore, even if the body thickness (thickness) differs for each imaging region, the depression time of the foot switch can be optimized.

(Example of feedback control when an input operation is accepted by the first operation unit)
With reference to FIG. 6, an example of feedback control in X-ray fluoroscopy when an input operation is accepted by the first operation unit 3a according to the first embodiment will be described based on a sequence diagram.

In step S1, the imaging control unit 60 accepts an input operation to the first operation unit 3a. Note that in the processing of steps S1 to S13, the acceptance of the input operation to the first operation unit 3a continues. Also, in the processing of steps S1 to S13, if the acceptance of the input operation to the first operation unit 3a is released, the processing ends.

In step S2, the imaging control unit 60 transmits an X-ray fluoroscopy start signal based on the set X-ray irradiation conditions 54 to the X-ray imaging unit 2. The X-ray imaging unit 2 then acquires the X-ray fluoroscopy start signal based on the set X-ray irradiation conditions 54.

In step S3, X-rays are irradiated by the X-ray irradiation unit 21 of the X-ray imaging unit 2 based on the set X-ray irradiation conditions 54, and a detection signal is obtained by the X-ray detection unit 22 of the X-ray imaging unit 2.

In step S4, the acquired detection signal is transmitted from the X-ray detection unit 22 of the X-ray imaging unit 2 to the image processing unit 61. The detection signal is then acquired by the image processing unit 61.

In step S5, the image processing unit 61 generates an X-ray image based on the detection signal obtained from the X-ray detection unit 22, and obtains the average, maximum, and minimum pixel values of each pixel in the specific region 59 contained in the X-ray image.

In step S6, the image processing unit 61 transmits the average, maximum, and minimum pixel values of each pixel in the acquired specific region 59 to the imaging control unit 60. The imaging control unit 60 then acquires the average, maximum, and minimum pixel values of each pixel in the specific region 59.

In step S7, if the average, maximum and minimum pixel values of each pixel in the acquired specific region 59 are within the range of the average, maximum and minimum pixel values as the target pixel value 58, the process proceeds to step S8. If the average, maximum and minimum pixel values of each pixel in the acquired specific region 59 are not within the range of the average, maximum and minimum pixel values as the target pixel value 58, the process proceeds to step S11.

In step S8, if the pixel values of five consecutive frames of X-ray images are within the range of the target pixel value 58, proceed to step S9. If there are fewer than five consecutive frames of X-ray images whose pixel values are within the range of the target pixel value 58, proceed to step S13.

In step S9, the imaging control unit 60 transmits an end signal for X-ray fluoroscopy to the X-ray imaging unit 2. The end signal for X-ray fluoroscopy is then acquired by the X-ray imaging unit 2.

In step S10, the X-ray imaging unit 2 ends the X-ray fluoroscopy.

In step S11, the imaging control unit 60 changes the set X-ray irradiation conditions 54.

In step S12, the imaging control unit 60 transmits a start signal for X-ray fluoroscopy based on the changed X-ray irradiation conditions 54 to the X-ray imaging unit 2. Then, the process proceeds to step S3, where the X-ray imaging unit 2 acquires a start signal for X-ray fluoroscopy based on the changed X-ray irradiation conditions 54.

In step S13, the imaging control unit 60 transmits an X-ray fluoroscopy start signal based on the X-ray irradiation conditions 54 that have been maintained unchanged to the X-ray imaging unit 2. Then, the process proceeds to step S3, where the X-ray imaging unit 2 acquires an X-ray fluoroscopy start signal based on the X-ray irradiation conditions 54 that have been maintained unchanged.

(Example of feedback control when input operation is accepted by second operation unit)
With reference to FIG. 7, an example of feedback control in X-ray fluoroscopy when an input operation is accepted by the second operation unit 3b according to the first embodiment will be described based on a sequence diagram.

In step S21, the imaging control unit 60 accepts an input operation to the second operation unit 3b. Note that in the processing of steps S21 to S30, the acceptance of the input operation to the second operation unit 3b continues. Also, in the processing of steps S21 to S30, if the acceptance of the input operation to the second operation unit 3b is released, the processing ends.

The processing from step S22 to step S30 is the same as the processing from step S2 to step S7 and step S11 to step S13 in the feedback control in X-ray fluoroscopy when the input operation is accepted by the first operation unit 3a described above, and therefore a description thereof will be omitted. Note that the processing from step S23 to step S30 is repeated until the acceptance of the input operation to the second operation unit 3b is released.

(X-ray image pixel value adjustment process and X-ray image display process)
8 and 9, the adjustment process of pixel values of an X-ray image and the display process of an X-ray image by the control unit 6 according to the first embodiment will be described. The adjustment process of pixel values of an X-ray image and the display process of an X-ray image by the control unit 6 are started based on the reception of an input operation related to X-ray irradiation by the operation unit 3.

In addition, in the processing of steps S101 to S110, the first operation unit 3a continues to receive input operations. If the acceptance of the input operations to the first operation unit 3a is released in the processing of steps S101 to S110, the processing ends. In addition, in the processing of steps S111 to S116 and S119, the second operation unit 3b continues to receive input operations. If the acceptance of the input operations to the second operation unit 3b is released in the processing of steps S111 to S116 and S119, the processing ends. Note that the order of the processing steps can be reversed or executed simultaneously as long as there are no contradictions between them.

In step S101, the imaging control unit 60 determines whether an input operation related to X-ray irradiation has been accepted by the first operation unit 3a or the second operation unit 3b. If an input operation related to X-ray irradiation has been accepted by the first operation unit 3a, the process proceeds to step 102, and if an input operation related to X-ray irradiation has been accepted by the second operation unit 3b, the process proceeds to step S111 in FIG. 9.

In step S102, the imaging control unit 60 causes the X-ray imaging unit 2 to start X-ray fluoroscopy imaging based on the set X-ray irradiation conditions 54 or on the changed X-ray irradiation conditions 54 after the X-ray irradiation conditions 54 have been changed. Then, the process proceeds to step S103.

In step S103, the image processing unit 61 generates an X-ray image based on the detection signal output from the X-ray detection unit 22. Then, the process proceeds to step S104.

In step S104, the display control unit 62 causes the display unit 4a to display the X-ray image generated by the image processing unit 61. Then, the process proceeds to step S105.

In step S105, the image processing unit 61 obtains the average, maximum, and minimum pixel values of each pixel in the specific region 59 contained in the generated X-ray image. Then, the process proceeds to step S106.

In step S106, if the average, maximum and minimum pixel values of each pixel in the specific region 59 acquired by the image processing unit 61 in the shooting control unit 60 are within the range of the target pixel value 58 (Yes in step S106), the process proceeds to step S107, and if the average, maximum and minimum pixel values of each pixel in the specific region 59 acquired by the image processing unit 61 are not within the range of the target pixel value 58 (No in step S106), the process proceeds to step S110.

In step S107, if the imaging control unit 60 finds that the pixel values of five consecutive frames of X-ray images are within the range of the target pixel value 58 (Yes in step S107), the process proceeds to step S108. If there are less than five consecutive frames of X-ray images whose pixel values are within the range of the target pixel value 58 (No in step S107), the process proceeds to step S103. Note that when proceeding to step S103, the X-ray irradiation conditions 54 are not changed.

In step S108, the imaging control unit 60 ends the X-ray fluoroscopy imaging by the X-ray imaging unit 2. After that, the process proceeds to step S109.

In step S109, the display control unit 62 causes the display unit 4a to display the last image hold image and "LIH", which allows the user to recognize that the X-ray image displayed on the display unit 4a is the last image hold image. Then, the process ends.

In step S110, the imaging control unit 60 changes the set X-ray irradiation conditions 54, or, if the set X-ray irradiation conditions 54 have already been changed, the changed X-ray irradiation conditions 54. Then, the process proceeds to step S103.

In step S111, the imaging control unit 60 causes the X-ray imaging unit 2 to start X-ray fluoroscopy imaging based on the set X-ray irradiation conditions 54 or on the changed X-ray irradiation conditions 54 after the X-ray irradiation conditions 54 have been changed. Then, the process proceeds to step S112.

In step S112, the image processing unit 61 generates an X-ray image based on the detection signal output from the X-ray detection unit 22. Then, the process proceeds to step S113.

In step S113, the display control unit 62 causes the display unit 4a to display the X-ray image generated by the image processing unit 61. Then, the process proceeds to step S114.

In step S114, the image processing unit 61 obtains the average, maximum, and minimum pixel values of each pixel in the specific region 59 contained in the generated X-ray image. Then, the process proceeds to step S115.

In step S115, if the shooting control unit 60 determines that the average, maximum and minimum pixel values of each pixel in the specific region 59 acquired by the image processing unit 61 are within the range of the target pixel value 58 (Yes in step S115), the processing proceeds to step 116; if the average, maximum and minimum pixel values of each pixel in the specific region 59 acquired by the image processing unit 61 are not within the range of the target pixel value 58 (No in step S115), the processing proceeds to step S119.

In step S116, the imaging control unit 60 determines whether or not the second operation unit 3b continues to accept input operations related to X-ray irradiation. If the second operation unit 3b continues to accept input operations related to X-ray irradiation (Yes in step S116), the process proceeds to step S112. If the second operation unit 3b does not continue to accept input operations related to X-ray irradiation (i.e., if the input operations related to X-ray irradiation by the second operation unit 3b have been released) (No in step S116), the process proceeds to step S117. Note that when proceeding to step S112, the X-ray irradiation conditions 54 are not changed.

In step S117, the imaging control unit 60 ends the X-ray fluoroscopy imaging by the X-ray imaging unit 2. Then, the process proceeds to step S118.

In step S118, the display control unit 62 causes the display unit 4a to display the last image hold image and "LIH", which allows the user to recognize that the X-ray image displayed on the display unit 4a is the last image hold image. Then, the process ends.

In step S119, the imaging control unit 60 changes the set X-ray irradiation conditions 54, or, if the set X-ray irradiation conditions 54 have already been changed, the changed X-ray irradiation conditions 54. Then, the process proceeds to step S112.

(Effects of the First Embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 when the pixel value of a pixel included in the generated X-ray image is within the range of the target pixel value 58, even if the first operation unit 3a continues to accept the input operation for irradiating X-rays. As a result, even if the input operation for irradiating X-rays continues to be accepted, the X-ray irradiation by the X-ray irradiation unit 21 is stopped when the pixel value of a pixel included in the generated X-ray image is within the range of the target pixel value 58. Therefore, it is possible to prevent the acceptance of the input operation for X-ray irradiation from being canceled before the pixel value is included in the range of the target pixel value 58 due to concerns about an increase in the subject's exposure dose, and it is possible to prevent an increase in the X-ray irradiation time based on the continued acceptance of the input operation for X-ray irradiation when the pixel value is included in the range of the target pixel value 58. In addition, when the X-ray irradiation is stopped by the imaging control unit 60, the pixel value of the pixel included in the generated X-ray image is included in the range of the target pixel value 58, so that the visibility of the generated X-ray image can be improved. For these reasons, it is possible to obtain X-ray images with improved visibility while minimizing the increase in the subject's radiation exposure.

In addition, in the first embodiment, the following additional effects can be obtained by configuring as follows:

That is, in the first embodiment, as described above, the imaging control unit 60 is configured to change the set X-ray irradiation conditions 54 and cause the X-ray irradiation unit 21 to irradiate X-rays in order to adjust the pixel values of the pixels included in the X-ray image when the pixel values of the generated X-ray image are not included within the range of the target pixel values 58, and to stop the X-ray irradiation by the X-ray irradiation unit 21 when the pixel values of the X-ray image generated based on the changed X-ray irradiation conditions 54 are included within the range of the target pixel values 58, even if the first operation unit 3a continues to accept an input operation to irradiate X-rays. As a result, the X-ray irradiation conditions 54 are changed so that the pixel values of the generated X-ray image are included within the range of the target pixel values 58, so that an X-ray image whose pixel values are included within the range of the target pixel values 58 can be easily generated. Therefore, an X-ray image with improved visibility can be easily obtained.

In addition, in the first embodiment, as described above, the display unit 4a that displays the X-ray image is further provided, and the display control unit 62 is configured to cause the display unit 4a to execute a display that allows the user to recognize that the X-ray irradiation by the X-ray irradiation unit 21 has been stopped, even if the first operation unit 3a continues to accept an input operation to irradiate X-rays, based on the fact that the pixel value in the X-ray image falls within the range of the target pixel value 58 and thus the X-ray irradiation by the X-ray irradiation unit 21 has been stopped. This allows the user to easily visually recognize that the X-ray irradiation has been stopped because the pixel value in the X-ray image falls within the range of the target pixel value 58.

In addition, in the first embodiment, as described above, the display control unit 62 is configured to cause the display unit 4a to execute a display that allows the user to recognize that the X-ray irradiation by the X-ray irradiation unit 21 has stopped, by causing the display unit 4a to display in a recognizable manner that the last X-ray image when the X-ray irradiation was stopped among the generated X-ray images is displayed on the display unit 4a as a recognizable display of the stop of X-ray irradiation by the X-ray irradiation unit 21. This allows the user to visually recognize more easily that the X-ray irradiation has stopped because the pixel value in the X-ray image is included within the range of the target pixel value 58, based on the display of the last X-ray image when the X-ray irradiation was stopped and the above-mentioned X-ray image.

In addition, in the first embodiment, as described above, the image processing unit 61 is configured to sequentially generate X-ray images, and the imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 when the pixel values in the multiple set X-ray images are within the range of the target pixel value 58, even if the first operation unit 3a continues to accept an input operation to irradiate X-rays. This makes it possible to prevent the X-ray irradiation by the X-ray irradiation unit 21 from being stopped when a pixel value in one X-ray image accidentally falls within the range of the target pixel value 58 due to the subject's body movement, etc. This makes it possible to improve the accuracy of obtaining X-ray images with improved visibility.

In addition, in the first embodiment, as described above, the operation unit 3 includes a first operation unit 3a and a second operation unit 3b, and the imaging control unit 60 is configured to stop the irradiation of X-rays by the X-ray irradiator 21 and stop the generation of the X-ray image when an input operation to irradiate X-rays is accepted by the first operation unit 3a and the pixel value of the generated X-ray image is within the range of the target pixel value 58, even if the input operation to irradiate X-rays continues to be accepted by the first operation unit 3a, and is configured to not stop the irradiation of X-rays by the X-ray irradiator 21 and generate an X-ray image when an input operation to irradiate X-rays is accepted by the second operation unit 3b and even if the pixel value of the generated X-ray image is within the range of the target pixel value 58. This allows the user to appropriately select between the first operation unit 3a, which stops the X-ray irradiation unit 21 from emitting X-rays even if the input operation for emitting X-rays continues to be accepted, and the second operation unit 3b, which causes the X-ray irradiation unit 21 to irradiate X-rays as long as the input operation for irradiating X-rays continues to be accepted, according to the purpose of use. This improves the convenience (usability) for the user.

Furthermore, in the first embodiment, as described above, the pixel values include the average value, maximum value, and minimum value of the pixel values of each pixel in the specific region 59 included in the X-ray image generated by the image processing unit 61, and the target pixel value 58 includes the average value, maximum value, and minimum value of the pixel values of each pixel in the specific region 59 set in each of the imaging sites of the subject. As a result, when the pixel values of the pixels included in the generated X-ray image are within the range of the target pixel value 58, the average value, maximum value, and minimum value of the pixel values of each pixel in the specific region 59 included in the X-ray image are each included in the desired range, so that the accuracy of obtaining an X-ray image with improved visibility can be improved.

In addition, in the first embodiment, as described above, the range of the target pixel value 58 is a specific range that is set in advance and is centered on the target pixel value 58. As a result, by providing a certain width centered on the target pixel value 58 when halting the X-ray irradiation by the X-ray irradiation unit 21, when the pixel value in the X-ray image is included within an allowable range centered on the target pixel value 58, the X-ray irradiation by the X-ray irradiation unit 21 can be appropriately stopped.

Furthermore, in the first embodiment, as described above, the set target pixel value 58 is configured to be changeable. This allows the target pixel value 58 to be changed depending on the part of the subject being imaged, the subject's body thickness, the purpose, etc., and therefore makes it possible to obtain an X-ray image with an appropriate brightness depending on the subject's body thickness, the purpose, etc.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to Fig. 10 and Fig. 11. In the X-ray fluoroscopy apparatus 110 in the second embodiment, unlike the first embodiment in which the operation unit 3 includes a first operation unit 3a and a second operation unit 3b, an example will be described in which the operation unit 3 is configured to be able to select a first fluoroscopy mode and a second fluoroscopy mode. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The operation unit 3 includes a foot switch 70 and an operation panel 33. The operation panel 33 is provided with a plurality of input units 33a (see FIG. 11(b)) that accept input operations related to X-ray irradiation. The input units 33a include an X-ray fluoroscopy button 36b and a target pixel value change button 37.

As shown in FIG. 11(a), the foot switch 70 is configured to receive input operations related to the start and end of X-ray irradiation by the X-ray irradiation unit 21. The foot switch 70 includes a fourth foot switch 74 used to perform fluoroscopic imaging based on the selected first or second fluoroscopic mode, and a fifth foot switch 75 used to perform general imaging.

As shown in FIG. 11(b), the X-ray fluoroscopy button 36b is configured to receive input operations related to the start and end of X-ray irradiation by the X-ray irradiation unit 21. The X-ray fluoroscopy button 36b is configured to receive input operations related to the start and end of fluoroscopy imaging based on the selected first fluoroscopy mode or second fluoroscopy mode.

The operation panel 33 is also provided with a first fluoroscopy mode selection button 38 and a second fluoroscopy mode selection button 39. The first fluoroscopy mode selection button 38 is a button that accepts an input operation for selecting the first fluoroscopy mode. The second fluoroscopy mode selection button 39 is a button that accepts an input operation for selecting the second fluoroscopy mode.

(First Fluoroscopy Mode and Second Fluoroscopy Mode)
The first fluoroscopy mode is a mode in which, when the pixel value of the X-ray image generated by the image processing unit 61 is within the range of the target pixel value 58, even if the input operation to irradiate X-rays continues to be accepted by the operation unit 3, the shooting control unit 60 stops the irradiation of X-rays by the X-ray irradiation unit 21 and the image processing unit 61 stops generating the X-ray image.

The second fluoroscopy mode is a mode in which the imaging control unit 60 does not stop the X-ray irradiation unit 21 from emitting X-rays, and the image processing unit 61 generates an X-ray image, even if the pixel values of the X-ray image generated by the image processing unit 61 are within the range of the target pixel value 58.

X-ray fluoroscopy in the first fluoroscopy mode differs from X-ray fluoroscopy in the first embodiment where input operation is accepted by the first operation unit 3a in the above-mentioned first embodiment in that the first fluoroscopy mode is configured to be selected in advance by the first fluoroscopy mode selection button 38. In other words, X-ray fluoroscopy in the first fluoroscopy mode is performed in the same manner as X-ray fluoroscopy in the first embodiment where input operation is accepted by the first operation unit 3a, except that the first fluoroscopy mode selection button 38 is used and the first operation unit 3a is not used.

Furthermore, X-ray fluoroscopy in the second fluoroscopy mode differs from X-ray fluoroscopy in the first embodiment where input operation is accepted by the second operation unit 3b in the above-mentioned embodiment in that the second fluoroscopy mode is configured to be selected in advance by the second fluoroscopy mode selection button 39. In other words, X-ray fluoroscopy in the second fluoroscopy mode is performed in the same manner as X-ray fluoroscopy in the first embodiment where input operation is accepted by the second operation unit 3b, except that the second fluoroscopy mode selection button 39 is used and the second operation unit 3b is not used.

(X-ray image pixel value adjustment process and X-ray image display process)
12 and 13, the adjustment process of pixel values of an X-ray image and the display process of an X-ray image by the control unit 6 according to the second embodiment will be described. The adjustment process of pixel values of an X-ray image and the display process of an X-ray image by the control unit 6 are started based on the acceptance of an input operation to either one of the first fluoroscopy mode selection button 38 and the second fluoroscopy mode selection button 39. In the description of the adjustment process of pixel values of an X-ray image and the display process of an X-ray image by the control unit 6 according to the second embodiment described later, the "operation unit 3" means the fourth foot switch 74 or the X-ray fluoroscopy button 36b.

In addition, in the processing of steps S203 to S211, the operation unit 3 continues to receive input operations. If the acceptance of the input operations to the operation unit 3 is released in the processing of steps S203 to S211, the processing ends. In addition, in the processing of steps S213 to S218 and S221, the operation unit 3 continues to receive input operations. If the acceptance of the input operations to the operation unit 3 is released in the processing of steps S213 to S218 and S221, the processing ends. Note that the order of the processing steps can be reversed or executed simultaneously as long as there are no contradictions between them.

In step S201, the imaging control unit 60 determines whether an input operation has been accepted for the first fluoroscopy mode selection button 38 or the second fluoroscopy mode selection button 39. If an input operation has been accepted for the first fluoroscopy mode selection button 38 (Yes in step S201), the process proceeds to step S202. If an input operation has been accepted for the second fluoroscopy mode selection button 39 (No in step S201), the process proceeds to step S212 in FIG. 13.

In step S202, the imaging control unit 60 determines whether or not an input operation related to X-ray irradiation has been accepted by the operation unit 3. If an input operation related to X-ray irradiation has been accepted by the operation unit 3 (Yes in step S202), the process proceeds to step S203; if an input operation related to X-ray irradiation has not been accepted by the operation unit 3 (No in step S202), the process proceeds to step S202.

The processing from step S203 to step S211 is similar to the processing from step S102 to step S110 in the first embodiment shown in FIG. 8, and therefore a description thereof will be omitted.

In step S212, the imaging control unit 60 determines whether or not an input operation related to X-ray irradiation has been accepted by the operation unit 3. If an input operation related to X-ray irradiation has been accepted by the operation unit 3 (Yes in step S212), the process proceeds to step S213; if an input operation related to X-ray irradiation has not been accepted by the operation unit 3 (No in step S212), the process proceeds to step S212.

The processing from step S213 to step S221 is similar to the processing from step S111 to step S119 in the first embodiment shown in FIG. 9, except that the operation unit 3 is used instead of the second operation unit 3b, and therefore a description thereof will be omitted.

The rest of the configuration of the second embodiment is the same as that of the first embodiment.

(Effects of the Second Embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the first fluoroscopy mode and the second fluoroscopy mode are selectable. The imaging control unit 60 is configured to stop the X-ray irradiation by the X-ray irradiation unit 21 and stop the generation of the X-ray image when the first fluoroscopy mode is selected and the pixel value of the generated X-ray image is within the range of the target pixel value 58, even if the operation unit 3 continues to accept the input operation to irradiate X-rays. When the second fluoroscopy mode is selected, even if the pixel value of the generated X-ray image is within the range of the target pixel value 58, the X-ray irradiation by the X-ray irradiation unit 21 is not stopped and an X-ray image is generated. This allows the user to appropriately select between the first fluoroscopy mode in which the X-ray irradiation by the X-ray irradiation unit 21 is stopped even if the input operation to irradiate X-rays continues to be accepted, and the second fluoroscopy mode in which the X-ray irradiation by the X-ray irradiation unit 21 irradiates X-rays if the input operation to irradiate X-rays continues to be accepted, according to the purpose. This improves the user's convenience (usability).

The other effects of the second embodiment are the same as those of the first embodiment.

[Modification]
It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

For example, in the above first and second embodiments, the X-ray fluoroscopy device is an example of a surgical X-ray fluoroscopy device that includes an apparatus main body including an X-ray imaging unit and an arm, and a monitor trolley, but the present invention is not limited to this. For example, the X-ray fluoroscopy device may be an X-ray fluoroscopy device that includes a close-up fluoroscopy table.

In the above first and second embodiments, an example was shown in which the operation unit included a foot switch and an X-ray fluoroscopy button on the operation panel, but the present invention is not limited to this. For example, the operation unit may be configured to include a joystick, a cable switch, a keyboard, and a touch panel.

In the above first and second embodiments, the target pixel value includes the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region set in each of the imaging sites of the subject, and the imaging control unit is configured to stop the irradiation of X-rays by the X-ray irradiation unit when the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region included in the generated X-ray image are within the range of the target pixel value even if the operation unit continues to accept an input operation to irradiate X-rays, but the present invention is not limited to this. For example, the target pixel value may be configured to include at least one of the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region set in each of the imaging sites of the subject. In this case, the target pixel value includes at least one of the average value, maximum value, and minimum value of the pixel value of each pixel in a specific region set in each imaging region of the subject, and the imaging control unit may be configured to stop the irradiation of X-rays by the X-ray irradiation unit when at least one of the average value, maximum value, and minimum value of the pixel value of each pixel in the specific region acquired by the image processing unit is included within the range of at least one of the corresponding average value, maximum value, and minimum value of the target pixel value.

In the above first and second embodiments, the target pixel value includes the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region set in each of the imaging sites of the subject, but the present invention is not limited to this. For example, the target pixel value may be configured to include other values such as the median instead of any of the average value, maximum value, and minimum value of the pixel values of each pixel in a specific region set in each of the imaging sites of the subject, or may be configured to include other values such as the median in addition to the average value, maximum value, and minimum value.

In addition, in the first and second embodiments described above, the range of target pixel values is an example of a specific range centered on a preset target pixel value, but the present invention is not limited to this. For example, the range of target pixel values does not have to be a range centered on the target pixel value as long as it is a specific range that includes the target pixel value.

In addition, in the first and second embodiments described above, examples have been shown in which the target pixel value is configured to be changeable, but the present invention is not limited to this. For example, the target pixel value may be configured not to be changeable.

In the above first embodiment, an example was shown in which the operation unit includes a second operation unit, but the present invention is not limited to this. For example, the operation unit may include only the first operation unit and not include the second operation unit. In addition, in the above second embodiment, an example was shown in which the operation unit is configured to be able to select between the first fluoroscopy mode and the second fluoroscopy mode, but the present invention is not limited to this. For example, the operation unit may be configured to be able to execute only the first fluoroscopy mode.

In addition, in the above first and second embodiments, an example has been shown in which the imaging control unit is configured to change the set X-ray irradiation conditions and irradiate X-rays when the pixel values of the generated X-ray image are not included within the range of the target pixel values, but the present invention is not limited to this. For example, the imaging control unit may cause the X-ray irradiator to irradiate X-rays without changing the set X-ray irradiation conditions.

In the above first and second embodiments, an example has been shown in which the display control unit is configured to cause the display unit to execute a display that allows the user to recognize that the X-ray irradiation by the X-ray irradiation unit has been stopped, even if the first operation unit or the operation unit in the first fluoroscopy mode continues to accept an input operation to irradiate X-rays, based on the pixel value in the X-ray image falling within the range of the target pixel value and thus causing the X-ray irradiation by the X-ray irradiation unit to be stopped; however, the present invention is not limited to this. For example, the display control unit does not have to cause the display unit to execute a display that allows the user to recognize that the X-ray irradiation by the X-ray irradiation unit has been stopped.

[Aspects]
It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

(Item 1)
an X-ray irradiation unit that irradiates X-rays;
an X-ray detection unit that detects the X-rays irradiated by the X-ray irradiation unit;
an operation unit that receives an input operation related to the irradiation of X-rays by the X-ray irradiation unit;
a control unit that controls the X-ray irradiation unit to irradiate X-rays based on an input operation of the operation unit, and controls the generation of an X-ray image based on a detection signal output from the X-ray detection unit,
the control unit is configured to stop the emission of X-rays by the X-ray irradiation unit when a pixel value of a pixel included in the generated X-ray image is within a range of a target pixel value, even if the operation unit continues to accept an input operation to irradiate X-rays.

(Item 2)
2. The X-ray fluoroscopy device according to claim 1, wherein the control unit is configured to change set X-ray irradiation conditions and cause the X-ray irradiator to irradiate X-rays in order to adjust the pixel values of the pixels included in the X-ray image when the pixel values of the generated X-ray image are not included within a range of the target pixel values, and to stop the irradiation of X-rays by the X-ray irradiator when the pixel values of the X-ray image generated based on the changed X-ray irradiation conditions are included within a range of the target pixel values even if the operation unit continues to accept an input operation to irradiate X-rays.

(Item 3)
A display unit for displaying the X-ray image is further provided.
3. The X-ray fluoroscopy device according to claim 1, wherein the control unit is configured to, based on the fact that the pixel value in the X-ray image falls within a range of the target pixel value, cause the display unit to execute a display that enables the user to recognize that the X-ray irradiation by the X-ray irradiation unit has been stopped, even if the operation unit continues to accept an input operation to irradiate X-rays.

(Item 4)
Item 4. The X-ray fluoroscopy device according to item 3, wherein the control unit is configured to cause the display unit to execute a recognizable display that the X-ray irradiation by the X-ray irradiation unit has stopped, by causing the display unit to display in a recognizable manner that the last of the generated X-ray images at the time when the X-ray irradiation was stopped is displayed on the display unit, as a recognizable display that the X-ray irradiation by the X-ray irradiation unit has stopped.

(Item 5)
5. The X-ray fluoroscopy device according to any one of items 1 to 4, wherein the control unit is configured to sequentially generate the X-ray images, and when the pixel values in the set plurality of X-ray images are included in the range of the target pixel value, the control unit is configured to stop the emission of X-rays by the X-ray irradiation unit even if the operation unit continues to accept an input operation to irradiate X-rays.

(Item 6)
the operation unit includes a first operation unit and a second operation unit,
The control unit is
when an input operation for irradiating X-rays is being accepted by the first operation unit and the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation for irradiating X-rays is being accepted by the first operation unit, the X-ray irradiation unit stops irradiating X-rays and stops generating the X-ray image;
6. The X-ray fluoroscopy device according to claim 1, wherein, when an input operation for irradiating X-rays is accepted by the second operation unit, even if the pixel value of the generated X-ray image is included in the range of the target pixel value, the X-ray irradiation by the X-ray irradiator is not stopped and the X-ray image is generated.

(Item 7)
A first fluoroscopy mode and a second fluoroscopy mode are selectable,
The control unit is
when the first fluoroscopy mode is selected and the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation for irradiating X-rays is continuously received by the operation unit, the X-ray irradiation unit stops irradiating X-rays and the generation of the X-ray image is stopped;
6. The X-ray fluoroscopy device according to claim 1, wherein, when the second fluoroscopy mode is selected, even if the pixel value of the generated X-ray image is included in the range of the target pixel value, the X-ray irradiation unit is not stopped and the X-ray image is generated.

(Item 8)
2. The X-ray fluoroscopy apparatus according to item 1, wherein the pixel value includes at least one of an average value, a maximum value, and a minimum value of pixel values of each pixel in a specific region included in the X-ray image generated by the control unit, and the target pixel value includes at least one of an average value, a maximum value, and a minimum value of pixel values of each pixel in the specific region set in each of the imaging sites of the subject.

(Item 9)
9. The X-ray fluoroscopic imaging apparatus according to item 8, wherein the range of the target pixel value is a specific range that is set in advance and has the target pixel value as a center.

(Item 10)
9. The X-ray fluoroscopic imaging apparatus according to item 8, wherein the set target pixel value is changeable.

3 Operation unit 3a First operation unit 3b Second operation unit 4a Display unit 21 X-ray irradiation unit 22 X-ray detection unit 54 X-ray irradiation conditions 58 Target pixel value 59 Specific region 6 Control unit 100, 110 X-ray fluoroscopy apparatus

Claims (10)

an X-ray irradiation unit that irradiates X-rays;
an X-ray detection unit that detects the X-rays irradiated by the X-ray irradiation unit;
an operation unit that receives an input operation related to the irradiation of X-rays by the X-ray irradiation unit;
a control unit that controls the X-ray irradiation unit to irradiate X-rays based on an input operation of the operation unit, and controls the generation of an X-ray image based on a detection signal output from the X-ray detection unit,
the control unit is configured to stop the emission of X-rays by the X-ray irradiation unit when a pixel value of a pixel included in the generated X-ray image is within a range of a target pixel value, even if the operation unit continues to accept an input operation to irradiate X-rays. The X-ray fluoroscopy device according to claim 1, wherein the control unit is configured to change the set X-ray irradiation conditions and cause the X-ray irradiation unit to irradiate X-rays in order to adjust the pixel values of the pixels included in the X-ray image when the pixel values of the generated X-ray image are not included within the range of the target pixel values, and to stop the X-ray irradiation by the X-ray irradiation unit when the pixel values of the X-ray image generated based on the changed X-ray irradiation conditions are included within the range of the target pixel values even if the operation unit continues to accept an input operation to irradiate X-rays. A display unit for displaying the X-ray image is further provided.
2. The X-ray fluoroscopy device according to claim 1, wherein the control unit is configured to, based on the fact that the X-ray irradiation unit has stopped emitting X-rays because the pixel value in the X-ray image falls within a range of the target pixel value, cause the display unit to execute a display that enables the user to recognize that the X-ray irradiation unit has stopped emitting X-rays, even if the operation unit continues to accept an input operation to irradiate X-rays. The X-ray fluoroscopy device according to claim 3, wherein the control unit is configured to cause the display unit to execute a recognizable display that the X-ray irradiation by the X-ray irradiation unit has stopped by causing the display unit to recognizably display that the last of the generated X-ray images at the time when the X-ray irradiation was stopped is displayed on the display unit as a recognizable display of the stop of X-ray irradiation by the X-ray irradiation unit. The X-ray fluoroscopy device according to claim 1, wherein the control unit is configured to sequentially generate the X-ray images, and is configured to stop the X-ray irradiation unit from irradiating X-rays when the pixel values in the set plurality of X-ray images are within the range of the target pixel values, even if the input operation for irradiating X-rays continues to be accepted by the operation unit. the operation unit includes a first operation unit and a second operation unit,
The control unit is
when an input operation for irradiating X-rays is being accepted by the first operation unit and the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation for irradiating X-rays is being accepted by the first operation unit, the X-ray irradiation unit stops irradiating X-rays and stops generating the X-ray image;
2. The X-ray fluoroscopy device according to claim 1, wherein, when an input operation for irradiating X-rays is accepted by the second operation unit, even if the pixel value of the generated X-ray image is included in the range of the target pixel value, the X-ray irradiator does not stop irradiating X-rays, and the X-ray image is generated. A first fluoroscopy mode and a second fluoroscopy mode are selectable,
The control unit is
when the first fluoroscopy mode is selected and the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation for irradiating X-rays is continuously received by the operation unit, the X-ray irradiation unit stops irradiating X-rays and the generation of the X-ray image is stopped;
2. The X-ray fluoroscopy apparatus according to claim 1, wherein when the second fluoroscopy mode is selected, even if the pixel value of the generated X-ray image is included in the range of the target pixel value, the X-ray irradiation unit is not stopped and the X-ray image is generated. The X-ray fluoroscopy apparatus of claim 1, wherein the pixel values include at least one of an average value, a maximum value, and a minimum value of the pixel values of each pixel in a specific region included in the X-ray image generated by the control unit, and the target pixel values include at least one of an average value, a maximum value, and a minimum value of the pixel values of each pixel in the specific region set in each imaging region of the subject. The X-ray fluoroscopy apparatus according to claim 8, wherein the range of the target pixel value is a specific range that is set in advance and has the target pixel value at its center. 9. The X-ray fluoroscopic imaging apparatus according to claim 8, wherein the set target pixel value is changeable.

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