WO2008044539A1 - Optical interference image diagnosing apparatus, and its processing method - Google Patents
Optical interference image diagnosing apparatus, and its processing method Download PDFInfo
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- WO2008044539A1 WO2008044539A1 PCT/JP2007/069259 JP2007069259W WO2008044539A1 WO 2008044539 A1 WO2008044539 A1 WO 2008044539A1 JP 2007069259 W JP2007069259 W JP 2007069259W WO 2008044539 A1 WO2008044539 A1 WO 2008044539A1
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- Prior art keywords
- light
- optical
- intensity distribution
- unit
- measurement
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/6852—Catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0066—Optical coherence imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/0209—Low-coherence interferometers
- G01B9/02091—Tomographic interferometers, e.g. based on optical coherence
Definitions
- the present invention relates to an optical coherence tomographic image diagnostic apparatus, and more particularly to a calibration process in an optical coherent fault image diagnostic apparatus.
- an optical interference slice image diagnostic apparatus for diagnosing arteriosclerosis, preoperative diagnosis at the time of endovascular treatment using a high-functional force tail such as a balloon catheter, a stent, or for confirming postoperative results (OCT: Optical Coherent Tomography) is used.
- An optical coherence tomography diagnostic apparatus divides low-coherence light output from a light source into measurement light and reference light, and emits the distal force through the optical fiber inside the catheter, and then biological tissue The reflected light reflected by the light is received by the same optical fiber, and the reflected light and the reference light are caused to interfere inside the apparatus, so that the interference intensity of the measurement light from the same optical path length as the reference light, that is, the light reflection The strength is acquired.
- the reference light is reflected by the mirror and the position of the mirror is moved back and forth so that the optical path length of the reference light is scanned and synchronized therewith.
- the reflection intensity distribution in the depth direction is obtained.
- Optical coherence tomography diagnostic equipment using wavelength sweep repeatedly scans the wavelength of the emitted light, and scans the optical path length of the reference light from the frequency distribution of the interfering light and obtains the measurement light and A reflection intensity distribution in the measurement light emission direction (depth direction) is obtained based on a point having the same optical path difference from the reference light.
- the optical coherence tomography diagnostic apparatus is generally configured to obtain a reflection intensity distribution in the depth direction in the living body by causing the measurement light and the reference light to interfere with each other. Therefore, it is necessary to appropriately calibrate the optical path difference between the measurement light and the reference light. Ie depth When displaying the reflected intensity distribution in the direction, it is necessary to adjust the optical path length corresponding to the predetermined reference point (zero point). Normally, the catheter can be replaced each time it is used to prevent infection. There are individual differences in the catheter, and the optical path length (ie, optical fiber length) from the light source inside the device to the exit position of the catheter tip is different. It is a force that is small but has variations.
- the optical path difference was calibrated while viewing the cross-sectional image.
- the present invention has been made in view of the above problems, and in an optical coherence tomography diagnostic apparatus, calibration of an optical path difference between measurement light and reference light can be performed accurately and easily. Like this.
- an optical coherence tomography diagnostic apparatus has the following configuration. That is,
- the measurement light While irradiating the measurement light to the measurement object, the measurement light is connected to an optical probe that receives the reflected light from the measurement object, and the light output from the light source is divided into the measurement light and the reference light, and the reflected light and An optical coherence tomography diagnostic apparatus that obtains a reflection intensity distribution in an emission direction of the optical probe by causing interference with the reference light and forms an image of the measurement object.
- An extraction means for extracting an intensity distribution for a unit; and a predetermined reference position in the emission direction of the optical probe, which is determined based on the intensity distribution extracted by the extraction means, does not match the predetermined position,
- Recognition means for recognizing a distance between a reference position and the predetermined position as a shift amount;
- Adjusting means for adjusting the optical path length of the measurement light or the reference light based on the deviation amount.
- FIG. 1 is a diagram showing an external configuration of an optical coherence tomography diagnosis apparatus (100) that is an optical coherence tomography diagnosis apparatus according to a first embodiment.
- FIG. 2 is a schematic diagram for explaining the outline of the operation of the catheter section 101 and the cross-sectional image generation process during optical coherence tomography diagnosis.
- FIG. 3 is a schematic diagram for explaining the outline of the operation of the catheter section 101 and the cross-sectional image generation process at the time of optical coherence tomography diagnosis.
- FIG. 4 is a diagram showing a functional configuration of the optical coherence tomography diagnostic apparatus 100.
- FIG. 5 is a diagram showing a detailed configuration of a signal processing unit 314 and functional blocks related to calibration.
- FIG. 6 is a diagram showing an example of a reflection intensity distribution in the depth direction displayed on the LCD monitor 327.
- FIG. 7 is a diagram showing the correspondence between the configuration of the tip of the optical probe 101 and the three peaks of reflection intensity.
- FIG. 8 is a diagram illustrating a configuration of a signal processing unit of an optical coherence tomography diagnosis apparatus that is an optical coherence tomography diagnosis apparatus according to a second embodiment.
- FIG. 9 is a diagram showing an example of an LCD monitor screen on which a cursor 801 for designating a position indicating reflection from the optical system surface is displayed.
- FIG. 10 is a diagram illustrating a configuration of a signal processing unit of an optical coherence tomography diagnosis apparatus that is an optical coherence tomography diagnosis apparatus according to a third embodiment.
- FIG. 1 is a diagram showing an external configuration of an optical coherence tomography diagnosis apparatus (100) that is an optical coherence tomography diagnosis apparatus according to the first embodiment.
- the optical coherence tomography diagnosis apparatus (100) includes a catheter unit 101 as an optical probe, a scanner / pullback unit 102, and an operation control unit 103, and includes a scanner / proneback unit 102. And the operation control device 103 are connected by a signal line 104.
- the catheter unit 101 has a long main body inserted directly into a blood vessel, and measures an internal state of the blood vessel using an optical system (not shown) passed through the lumen of the catheter unit 101.
- the scanner / pullback unit 102 defines a radial scan of the optical system in the catheter unit 101.
- the operation control device 103 includes a function for inputting various setting values and a mechanism for processing data obtained by measurement and displaying the data as a cross-sectional image when performing optical coherence tomography diagnosis. .
- reference numeral 111 denotes a main body control unit that processes data obtained by measurement and outputs a processing result.
- Reference numeral 1111 denotes a printer and a DVD recorder, which print (output) processing results in the main body control unit 111 and store them as data.
- Reference numeral 112 denotes an operation panel, and the user inputs various setting values via the operation panel 112.
- Reference numeral 113 denotes an LCD monitor that displays a processing result in the main body control unit 111.
- 2 and 3 are schematic diagrams for explaining the outline of the operation of the catheter unit 101 and the cross-sectional image generation process at the time of optical coherence tomography diagnosis.
- 2 and 3 are a perspective view and a cross-sectional view, respectively, of a blood vessel (measurement target) with the catheter 101 inserted therein.
- 201 indicates a cross section of the blood vessel in which the catheter unit 101 is inserted.
- An optical system (not shown) is passed through the catheter portion 101 to the vicinity of the tip, and a linear drive device (not shown) is rotated while rotating in the direction of arrow 202 by a radial scanning motor (not shown). As shown, the direction proceeds to the direction of arrow 203 (the long axis direction of the catheter portion 101). Meanwhile, the optical system emits measurement light and receives reflected light at each rotation angle.
- lines 1, 2,..., 512 indicate the emission direction of the measurement light at each rotation angle.
- 512 times of light emission / light reception are intermittently performed while the optical system rotates 360 degrees on the predetermined blood vessel cross section 201. Note that the number of light emission / light reception times during the 360-degree rotation is not limited to this and can be arbitrarily set.
- a scan that repeats light emission / light reception while rotating the optical system in this manner is generally referred to as "radial scan (radial scan)".
- Reference numeral 309 denotes a light source such as an ultra-high luminance light emitting diode.
- the light source 309 emits low-coherence light that exhibits coherence only in a short distance range in which the wavelength is about 1310 nm and the coherence distance (coherent length) is about several m to about several tens of m. Output.
- the low coherence light output from the light source 309 is incident on one end of the first single mode fiber 328, and is transmitted to the front end face side as measurement light.
- the first single mode fiber 328 is optically coupled to the second single mode fiber 329 at an intermediate optical coupler unit 308. Therefore, the optical coupler unit 308 branches the signal into two and transmits it.
- An optical rotary joint 303 that couples between the non-rotating part and the rotating part and transmits the measurement light is provided on the tip side of the optical coupler part 308 of the first single mode fiber 328! /, Ru
- the connector portion 302 of the catheter portion 101 is detachably connected to the distal end of the third single mode fiber 330 passed through the optical rotary joint 303.
- the third single mode fiber 330 is connected to the catheter portion 1 via the connector portion 302.
- the measurement light from the light source 309 is transmitted to the fourth single mode fiber 331 that can be rotationally driven.
- the transmitted measurement light is deflected laterally by deflecting means such as a mirror provided at the distal end portion 301 of the optical system, and is radially scanned in the direction of the living tissue (measurement target) in the body cavity. Emitted. Then, a part of the reflected light scattered on the surface of the living tissue side or inside is taken in by the front end 301, returns to the first single mode fiber 328 side through the reverse optical path, and part thereof by the optical coupler 308. Moves to the second single mode fiber 329 side, and enters one of the second single mode fibers 329 into a photodetector (for example, a photodiode 310).
- a photodetector for example, a photodiode 310
- the rotating part side of the optical rotary joint 303 is rotationally driven by a radial scanning motor 305 of a rotational drive device 304. Further, the rotation angle of the radial scanning motor 305 is detected by the encoder unit 306. Furthermore, the optical rotary joint 303 includes a linear drive device 307, and based on an instruction from the signal processing unit 314, the operation (axial direction in the distal direction in the body cavity and the opposite direction) of the catheter unit 101 is inserted. Movement). The axial movement is realized by the operation of the linear drive device 303 based on the control signal from the signal processing unit 314.
- the radial scanning motor 305 and the linear drive device 307 may be detachably connected or may be configured integrally. Further, the axial movement by the linear drive device 307 can be realized by a ball screw or the like.
- an optical path length variable mechanism 316 that changes the optical path length of the reference light is provided on the distal end side of the optical coupler section 308 of the second single mode fiber 329.
- the optical path length variable mechanism 316 includes a first optical path length changing means that changes the optical path length corresponding to the examination range in the depth direction (outgoing direction) of the living tissue (measurement target) at high speed, and the catheter unit 101.
- the individual differences in the length of each optical system (mainly optical fiber 331) included in the catheter section 101 when the tube is used (variation in the optical path length from the light source to the emission position of the optical system)
- the second optical path length changing means optical path length adjusting means for changing the optical path length corresponding to the variation in the length is provided so that it can be absorbed.
- the single-axis stay is opposed to the tip of the second single mode fiber 329 and the tip.
- a grating 319 is arranged via a collimating lens 321 that is mounted on the die 320 and is movable in the direction indicated by an arrow 323.
- a galvanometer mirror 317 capable of turning by a minute angle is attached as a first optical path length changing means via a lens 318 corresponding to the grating 319 (diffraction grating).
- the galvanometer mirror 317 is rotated at a high speed in the direction of an arrow 322 by a galvanometer controller 324.
- the galvanometer mirror 317 reflects the reference light by the mirror of the galvanometer, and by applying an AC drive signal to the galvanometer that functions as a mirror for the reference light, the mirror received in the movable part at high speed. It is configured to rotate.
- a drive signal is applied to the galvanometer from the galvanometer controller 324 and rotated at high speed in the direction of the arrow 322 by the drive signal, so that the optical path length of the reference light is the depth of the living tissue. It will change at a high speed by the amount corresponding to the direction inspection range.
- One period of this change in optical path difference is the period for acquiring interference light for one line (one unit).
- the uniaxial stage 320 has a second optical path length change that has a variable range of optical path lengths that can absorb variations in optical path length for each optical system included in the catheter unit 101.
- Means optical path length adjusting means.
- the single-axis stage 320 also has a function as an adjusting means for adjusting the offset. For example, even when the tip of the optical probe 301 is not in close contact with the surface of the living tissue, the optical path length can be changed minutely by the single-axis stage 320 so as to interfere with the surface position of the living tissue. It becomes possible.
- the reference light whose optical path length is changed by the optical path length variable mechanism 316 is obtained from the first single mode fiber 338 side by the optical coupler unit 308 provided in the middle of the second single mode fiber 329.
- the light is mixed (interfered) with the reflected light and received by the photodiode 310.
- the demodulator 312 After being amplified by 311, it is input to the demodulator 312.
- the demodulator 312 performs demodulation processing for extracting only the signal portion of the interfered light, and its output is input to the A / D converter 313.
- the interference optical signal is sampled for 200 points, and one line of data is decoded. Digital data (interference light data) is generated.
- the sampling frequency is the value obtained by dividing the scanning time of the optical path length by 200.
- the line-by-line interference light data (line data) generated by the A / D converter 313 is input to the signal processing unit 314.
- This signal processing unit 314 converts the line data in the depth direction (outgoing direction) into a video signal to form cross-sectional images at each position in the blood vessel, and the LCD monitor 327 (Fig. 1 (corresponding to 113 of 1).
- the signal processing unit 314 is connected to the optical path length adjusting unit control device 326 and controls the position of the single-axis stage 320 via the optical path length adjusting unit control device 326.
- the signal processing unit 314 is connected to the motor control circuit 325 and controls the rotational drive of the radial scanning motor 305.
- the signal processing unit 314 is connected to a galvanometer controller 324 that controls scanning of the optical path length of the reference light mirror (galvanometer mirror 317).
- a drive signal is output from the galvanometer controller 324 to the signal processing unit 314, and the motor control device 325 is synchronized with the galvanometer controller 324 based on this drive signal.
- the signal processing unit 314 is connected to an input device 328 (corresponding to the operation panel 112 in FIG. 1), and can accept various instructions from the user.
- FIG. 5 shows a detailed configuration of the signal processing unit 314 and functional blocks related to calibration.
- the line data generated by the A / D conversion unit 313 is output from the radial scanning motor 1 using the signal of the encoder unit 306 of the radial scanning motor 305 output from the motor control circuit 325 in the line memory unit 401. After being processed so that the number of lines per rotation is 512, it is output to the line data generation unit 402 in the subsequent stage.
- the line data generation unit 402 performs line addition averaging processing, filter processing, logarithmic conversion, and the like, and outputs the result to the signal post-processing unit 403 at the subsequent stage.
- the signal post-processing unit 403 performs contrast adjustment, brightness adjustment, gamma correction, frame correlation, sharpness processing, etc. It is output to the image construction unit (DSC) 404.
- DSC image construction unit
- the image construction unit 404 converts the polar coordinate line data string into a video signal, and displays the blood vessel cross-sectional image on the LCD monitor 327.
- an example of constructing an image from 512 lines is shown. This is not limited to this number of lines.
- the line data output from the line data generation unit 402 is input to the line data extraction unit 405.
- the line data extraction unit 405 extracts one line (one unit) of predetermined line data from the plurality of line data.
- the extracted line data for one line is displayed on the line data graph display unit 406 of the LCD monitor 327 as a reflection intensity distribution in the depth direction at a predetermined rotation angle.
- the optical system of the optical probe (catheter unit) varies in optical path length for each individual, the user is displayed on the line data graph display unit 406 of the LCD monitor 327. Based on the reflection intensity distribution, the deviation amount of the optical path difference is read. Specifically, by using the cursor moving unit 408 of the input device 328, the cursor displayed on the LCD monitor is moved to a predetermined reference position (described later), and the position of the cursor is read. The amount of displacement can be read.
- the cursor moving unit 408 may be a keyboard, a mouse, a trackball, or the like.
- the read deviation amount is input via the optical path difference deviation amount input unit 407 of the input device 328.
- the input deviation amount is transmitted to the optical path length adjusting means control device 326 via the control unit 406, and the second optical path length changing means (optical path length adjusting means) is operated based on the deviation amount.
- the variation in the optical path length for each optical probe is absorbed.
- FIG. 6 is a diagram illustrating an example of the reflection intensity distribution in the depth direction (outgoing direction) displayed on the line data graph display unit 406 of the LCD monitor 327.
- the horizontal axis indicates the distance in the depth direction (unit: m), and the vertical axis indicates the reflection intensity.
- the zero point on the horizontal axis indicates a position that optically matches the initial length of the optical path length on the reference light side in the optical path on the measurement light side. This position corresponds to the tip of the central axis of the optical system when the optical system length of the optical probe (catheter part 101) is an ideal length (length without deviation), in other words, the optical axis is laterally moved.
- the position where the reflective surface to be deflected to the position is assumed Is shown.
- FIG. 6 shows a reflection intensity distribution in a state before the catheter unit 101 is inserted into a blood vessel. Normally, when low coherence light is emitted / received with the catheter 101 not inserted into the blood vessel, three reflection intensity peaks appear as shown in FIG.
- FIG. 7 is a diagram showing the correspondence between the configuration of the distal end portion of the catheter portion 101 and the three peaks of the reflection intensity.
- the distal end portion of the catheter portion 101 is covered with a light-transmitting catheter sheath 601, and an optical fiber 602 (corresponding to the single mode fiber 331) is placed inside the catheter sheath 601.
- An optical lens 603 for condensing the emitted light and an optical mirror 604 for deflecting the traveling direction of the light by reflecting the collected light by about 90 degrees and emitting it toward the living tissue are arranged. Being! /
- the light reflected at the reflection position 608 of the optical mirror 604 is partially reflected on the optical system surface 605, the catheter sheath inner surface 606, and the catheter sheath outer surface 607 before being emitted toward the living tissue. Will be reflected.
- the first peak indicates a position (reference position) indicating reflection from the optical system surface 605 (that is, the position of the emission end from the optical system).
- the ideal distance from the zero point on the horizontal axis to the first peak in Fig. 6 is ideally equal to the distance from the optical mirror 604 to the optical system surface 605 (the radius of the optical lens 603). Deviations due to individual differences in the length of the optical system of the optical probe (category part 101) occur.
- the optical path length on the reference light side may be adjusted by the amount of this deviation.
- the position showing reflection from the optical system surface 605 is the foremost of the three top peaks appearing in the reflection intensity distribution (the shallowest position in the depth direction, in other words, the This is the peak (peak 1) position at the position close to the mouth point.
- a cursor 502 for reading the position of peak 1 is displayed and can be arbitrarily moved via the curry moving unit 408. Further, the current position of the force 1 502 is displayed in the cursor position display field 503. Therefore, the operator moves the cursor 502 to the position of peak 1 (reference position: a position indicating reflection from the optical system surface 605), and reads the numerical value displayed in the cursor position display field 503 to The position of 1 can be accurately recognized.
- the position of peak 1 reference position: position showing reflection from the optical system surface 605
- the lens radius of the optical science lens 603 is assumed to be a 0.99 am, it forces the amount of deviation of the optical path difference is 70 mu m s Wakakaru.
- the user inputs â70â to the deviation amount input ff 510 via the optical path difference deviation amount input unit 407 of the input device 328 and presses the OK button 511.
- the deviation amount input via the optical path difference deviation input unit 407 of the input device 328 is transmitted to the optical path length adjusting means controller 326 via the control unit 406, and the optical path length adjustment is performed. Is called.
- the force for adjusting the optical path length by moving the collimating lens 321 is not limited to this, and the galvanometer mirror 317 may be moved. Further, the optical path length on the measurement light side may be adjusted on the reference light side. In that case, it is desirable to provide the optical path length adjusting unit in the scanner / pullback unit 102.
- the configuration is such that the line data for one line is extracted and displayed, so that the user only compares it with the lens radius of a known optical lens.
- the shift amount of the optical path difference is recognized with high accuracy.
- an input of a deviation amount recognized by the user is accepted, and the deviation amount according to the accepted deviation amount is accepted.
- the optical path length adjusting means By configuring the optical path length adjusting means to operate, it is possible to easily calibrate the optical path difference.
- the deviation amount of the optical path difference read by the user is manually input based on the reflection intensity distribution in the depth direction displayed on the line data graph display section of the LCD monitor 328.
- Force S the present invention is not particularly limited to this.
- the amount of deviation is automatically calculated. Do it like that.
- FIG. 8 is a diagram showing a configuration of the signal processing unit 701 of the optical coherence tomography diagnosis apparatus 100 that is the optical coherence tomography diagnosis apparatus according to the present embodiment. Note that functions that are the same as those of the signal processing unit 314 shown in the first embodiment are given the same reference numerals, and descriptions thereof are omitted. Here, differences from the signal processing unit 314 will be mainly described.
- the line data extracted by the line data extraction unit 405 is displayed on the line data graph display unit 406 of the LCD monitor 327 as a reflection intensity distribution in the depth direction. At this time, a cursor for designating a position indicating reflection from the optical system surface 605 is also displayed.
- 801 in FIG. 9 is a diagram showing an example of a screen of the LCD monitor on which a cursor 802 for designating a position indicating reflection from the optical system surface 605 is displayed.
- the input device 328 is provided with a cursor moving unit 408, which can move the cursor 802 displayed on the LCD monitor.
- the user moves the cursor 802 to a position indicating reflection from the optical system surface 605 and presses an OK button 803.
- the cursor moving unit 408 may be a keyboard, a mouse, a trackball, or the like.
- the input device 328 reads the position where the cursor 802 is displayed and transmits it to the control unit 406. Specifically, information of 220 in is transmitted to the control unit 401.
- the optical path difference deviation calculation unit 702 of the control unit 406 calculates the difference between the preset lens radius of the optical lens and the position of the curry 802 transmitted from the input device 328. The amount of deviation is calculated. For example, 150 m is set as the lens radius of the optical lens. If it is set, 70 in is calculated as the deviation.
- the calculated deviation amount is transmitted to the optical path length adjusting means control device 326, and in response thereto, the optical path length adjustment is automatically performed.
- the user moves the cursor with respect to the displayed line data for one line, and shows the reflection from the optical system surface. It is possible to automatically calibrate the optical path difference simply by specifying the position.
- the force that the user designates a position indicating reflection from the optical system surface is not particularly limited to this.
- FIG. 10 is a diagram showing a configuration of the signal processing unit 901 of the optical coherence tomography diagnosis apparatus 100 that is the optical coherence tomography diagnosis apparatus according to the present embodiment. Note that functions that are the same as those of the signal processing unit 701 shown in the second embodiment are given the same reference numerals, and descriptions thereof are omitted. Here, the description will focus on differences from the signal processing unit 701.
- the line data extracted by the line data extraction unit 405 is input to the optical path difference detection unit 902.
- the optical path difference detection unit 902 extracts the top three peaks having the highest reflection intensity from the input line data. Furthermore, among the extracted peaks, the peak with the closest reflection position (the peak at the shallowest position in the depth direction) is extracted.
- the position of the extracted peak in the depth direction is detected.
- the deviation of the optical path difference is calculated by reading the lens radius of the optical lens set (stored) in advance and taking the difference from the detected position.
- the calculated deviation amount is transmitted to the optical path length adjusting unit control device 326 via the control unit, and optical path length adjustment is performed.
- the user can automatically acquire at least one line of data before inserting the catheter unit 101 into the blood vessel.
- the optical path difference for each optical probe can be calibrated.
- the reflection position is the most prominent among them.
- the force S for extracting the position of a previous peak and the present invention is not particularly limited to this.
- the peak position with the maximum reflection intensity may be extracted.
- the peak position with the reflection position closest to the peak having the reflection intensity equal to or higher than a predetermined value may be extracted.
- the calibration is performed with the position showing the reflection from the optical system surface as the reference position.
- the present invention is not limited to this, and the reflection from the catheter sheath inner surface or the catheter sheath outer surface is performed. Make sure to calibrate using the indicated position as the reference position. In this case, out of the top three peaks with the highest reflection intensity, the position of the second or third peak showing the reflection is extracted, and the difference from the preset catheter sheath inner or outer diameter is compared. The amount of deviation is calculated.
- the optical path difference calibration in the optical coherence tomography diagnosis apparatus has been described.
- the present invention is not particularly limited to this, and the optical coherence tomography diagnosis apparatus using wavelength sweeping may be different. It's possible to apply it.
- the second optical path length changing means is provided as the optical path length variable mechanism. (That is, it does not have the first optical path length changing means). For this reason, the deviation amount of the optical path difference output from the signal processing units 314, 701, 901 is transmitted to the optical path length adjusting means control device 326, and the second optical path length changing means (optical path length adjusting means) operates. As a result, optical path length calibration is realized.
- the optical path length adjustment is performed with the radius of the optical lens 603 as a known value.
- the present invention is not necessarily limited to this, for example, a prism that connects the tip of the optical system with a lens.
- the distance from the reflection part of the optical element to the measurement light emitting end can be set to a known value.
- the optical probe is a device that does not reflect the measurement light
- the reference light side optical path length initial value from the measurement light and reference light branching section (optical coupler section 308) to the reference light mirror is obtained. If it is held as a known value, the optical path length from the measurement light and reference light branch to the measurement light side optical system exit end The deviation can be measured and adjusted (calibrated).
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Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-280566 | 2006-10-13 | ||
| JP2006280566 | 2006-10-13 |
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| Publication Number | Publication Date |
|---|---|
| WO2008044539A1 true WO2008044539A1 (en) | 2008-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/069259 Ceased WO2008044539A1 (en) | 2006-10-13 | 2007-10-02 | Optical interference image diagnosing apparatus, and its processing method |
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| Country | Link |
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| WO (1) | WO2008044539A1 (ja) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010098014A1 (ja) * | 2009-02-24 | 2010-09-02 | ãã«ã¢æ ªåŒäŒç€Ÿ | ç»å蚺æè£ 眮åã³ãã®å¶åŸ¡æ¹æ³ |
| JP2011206373A (ja) * | 2010-03-30 | 2011-10-20 | Terumo Corp | å ç»å蚺æè£ 眮åã³ãã®è¡šç€ºå¶åŸ¡æ¹æ³ |
| JP2011206375A (ja) * | 2010-03-30 | 2011-10-20 | Terumo Corp | å ç»å蚺æè£ 眮åã³ãã®è¡šç€ºå¶åŸ¡æ¹æ³ |
| US8493567B2 (en) | 2008-09-25 | 2013-07-23 | Terumo Kabushiki Kaisha | Optical tomographic image acquisition apparatus and method of acquiring optical tomographic image which adjusts reference position that acquires optical tomographic image based on sheath interference signal |
| JP2015511162A (ja) * | 2012-02-22 | 2015-04-16 | ãŽã©ã«ã«ã ã³ãŒãã¬ã€ã·ã§ã³ïŒ¶ïœïœïœïœïœïœ ïœïœïœïœïœïœïœïœïœïœ | èªåèŒæ£ã·ã¹ãã ããã³äœ¿ç𿹿³ |
| JP7543462B2 (ja) | 2022-02-24 | 2024-09-02 | ãã€ãã³ ãŠãŒãšã¹ãšã€ïŒã€ã³ã³ãŒãã¬ã€ããã | ã·ã¹ãã ã®æ£ç¢ºãªïœãªãã»ããèŒæ£ |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000097846A (ja) * | 1998-09-21 | 2000-04-07 | Olympus Optical Co Ltd | å èµ°æ»ãããŒãè£ çœ® |
-
2007
- 2007-10-02 WO PCT/JP2007/069259 patent/WO2008044539A1/ja not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000097846A (ja) * | 1998-09-21 | 2000-04-07 | Olympus Optical Co Ltd | å èµ°æ»ãããŒãè£ çœ® |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8493567B2 (en) | 2008-09-25 | 2013-07-23 | Terumo Kabushiki Kaisha | Optical tomographic image acquisition apparatus and method of acquiring optical tomographic image which adjusts reference position that acquires optical tomographic image based on sheath interference signal |
| US9207064B2 (en) | 2008-09-25 | 2015-12-08 | Terumo Kabushiki Kaisha | Optical tomographic image acquisition apparatus and method of acquiring optical tomographic image which adjusts reference position that acquires optical tomographic image based on sheath interference signal |
| WO2010098014A1 (ja) * | 2009-02-24 | 2010-09-02 | ãã«ã¢æ ªåŒäŒç€Ÿ | ç»å蚺æè£ 眮åã³ãã®å¶åŸ¡æ¹æ³ |
| US8994803B2 (en) | 2009-02-24 | 2015-03-31 | Terumo Kabushiki Kaisha | Image apparatus and control method thereof configured to determine optical probe abnormality |
| JP2011206373A (ja) * | 2010-03-30 | 2011-10-20 | Terumo Corp | å ç»å蚺æè£ 眮åã³ãã®è¡šç€ºå¶åŸ¡æ¹æ³ |
| JP2011206375A (ja) * | 2010-03-30 | 2011-10-20 | Terumo Corp | å ç»å蚺æè£ 眮åã³ãã®è¡šç€ºå¶åŸ¡æ¹æ³ |
| US8868159B2 (en) | 2010-03-30 | 2014-10-21 | Terumo Kabushiki Kaisha | Optical imaging diagnostic apparatus and the display control method thereof |
| JP2015511162A (ja) * | 2012-02-22 | 2015-04-16 | ãŽã©ã«ã«ã ã³ãŒãã¬ã€ã·ã§ã³ïŒ¶ïœïœïœïœïœïœ ïœïœïœïœïœïœïœïœïœïœ | èªåèŒæ£ã·ã¹ãã ããã³äœ¿ç𿹿³ |
| JP7543462B2 (ja) | 2022-02-24 | 2024-09-02 | ãã€ãã³ ãŠãŒãšã¹ãšã€ïŒã€ã³ã³ãŒãã¬ã€ããã | ã·ã¹ãã ã®æ£ç¢ºãªïœãªãã»ããèŒæ£ |
| US12121206B2 (en) | 2022-02-24 | 2024-10-22 | Canon U.S.A., Inc. | Accurate z-offset calibration for OCT system |
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