CN209529159U - CT picture quality and dose of radiation body mould and CT imaging system - Google Patents

Abstract

The utility model belongs to for the Instrument technology field of radiodiagnosis more particularly to a kind of CT picture quality and dose of radiation body mould and the CT imaging system with the CT picture quality and dose of radiation body mould.Wherein, CT picture quality and dose of radiation body mould, including cylinder and lid, lid include the first lid and the second lid, and the first lid and the second lid cover set at both ends of the cylinder body respectively, and multiple detachable parts have also been removably installed in cylinder.The utility model is able to solve the technical issues of being difficult to the progress CT simulation of infant's body existing in the prior art.

Description

CT Image Quality and Radiation Dose Phantoms and CT Imaging Systems

technical field

The utility model belongs to the technical field of radiological diagnostic instruments, in particular to a CT image quality and radiation dose phantom and a CT imaging system with the CT image quality and radiation dose phantom.

Background technique

There is ionizing radiation in CT, especially for children who are in the growth and development stage, and infants and young children are more susceptible to the effects of radiation. Some data show that the dose absorbed by CT in the tissue unit volume of children is 10 times higher than that of adults, and the tissue cells with vigorous metabolism are more sensitive to radiation; there is still a dose accumulation effect, and the accumulated radiation dose is more than that of adults, which is easy to induce other diseases. is the occurrence of tumors.

Due to their special body size, infants and young children have different body tissue proportions than adults, which is a research hotspot and also a difficulty in radiation dose control. In daily work, CT inspectors control the impact of radiation dose on infants and young children based on the ALARA (as low as reasonably achievable) principle, but currently there are no scanning parameter standards for different CT inspection equipment to be further optimized.

Utility model content

The purpose of the utility model is to provide a CT image quality and radiation dose phantom to solve the technical problem existing in the prior art that it is difficult to perform CT simulation on the body of an infant.

The CT image quality and radiation dose phantom includes a cylinder and a cover. The cover includes a first cover and a second cover. The first cover and the second cover are respectively covered at both ends of the cylinder. A plurality of detachable parts can also be detachably installed; the detachable parts include a first detachable part, and the first detachable part includes a first plate, and a plurality of first pipes are installed on the first plate, and the first plate The body is provided with a first through hole penetrating with the hollow part of the first pipe body.

The beneficial effects of the utility model CT image quality and radiation dose phantom are:

By setting the cylinder body, the first cover body and the second cover body, and detachably setting detachable parts in it, water can be poured into the cylinder body and the cover body, and the detachable parts can be used to simulate the internal parts of the human body such as bones , lungs and other organs. The size of the entire model fully simulates the length and diameter of the chest and abdomen of a 1-year-old child, and the entire phantom is filled with a water background. As a personalized phantom for infants and young children, it is used to optimize children's scanning parameters of different CT companies. By providing a first detachable part and a hollow first tube body on the first detachable part, the first tube body can be used to hold polystyrene bottles containing different contrast agents, so that different concentrations can be achieved Determination of the signal-to-noise ratio and contrast-to-noise ratio of the contrast agent in the water model background.

Further preferred technical solution, its additional feature is that the detachable part includes a second detachable part, the second detachable part has a second plate, the first side of the second plate is equipped with a conical housing, the second plate The second side of the body is provided with a plurality of counterbore, and each first pipe body is respectively inserted into a counterbore.

By setting the counterbore on the second plate body, it can be used to accept the polystyrene bottle placed in the first pipe body. Moreover, the first pipe body and the second counterbore are used to jointly accommodate the polystyrene bottle, so that the first pipe body and the second counterbore can be separated, that is, the side wall and the bottom of the accommodation space are separated, which is beneficial to the first pipe body. Clean to avoid fouling inside the first tube.

A further preferred technical solution is characterized in that the first cover is provided with a first protrusion, the first plate is provided with a first positioning hole, and the first protrusion is inserted into the second position in a circumferentially fixed manner. in a positioning hole.

By providing the first positioning hole and making it circumferentially fixedly connected with the first protrusion on the first cover, the first cover and the first detachable component can be kept relatively stable.

The preferred technical solution is characterized in that the detachable part includes a second detachable part, the second detachable part has a second plate body, a conical shell is installed on the first side of the second plate body, and the conical shell The top is connected with the second plate body.

By setting the second detachable part, the hollow conical shell on the second detachable part can be used to simulate the contrast of the lungs, and the texture of the simulated lungs such as sponge can be set in the hollow conical shell to make the image Generates non-linear gradients that can be used to evaluate noise figure settings in automated tube current modulation for CT.

The preferred technical solution has an additional feature that the detachable part includes a third detachable part, the third detachable part includes a third plate body, and a plurality of third pipe bodies with different diameters are installed on the third plate body.

By arranging the third plate to arrange third tubes with different diameters on the third plate, whether these third tubes with different diameters can be distinguished by CT can be used to determine the ability of CT scanning to resolve the smallest target.

A further preferred technical solution is additionally characterized in that it further includes a fourth plate body, and the fourth plate body is provided with a plurality of fourth counterbores, and each third pipe body can be inserted into one fourth counterbore.

The fourth plate is set, and the fourth counterbore can be used to block an open end of the third pipe body, so that both ends of the third pipe body can be kept in an open state during cleaning, thereby facilitating the cleaning of the third pipe body. cleaning.

A further preferred technical solution is characterized in that the third pipe is installed on one side of the third plate, the other side of the third plate is provided with a third positioning hole, and the second cover is provided with a third protrusion. The raised portion, the third raised portion can be inserted into the third positioning hole in a circumferentially fixed manner.

The second cover and the third detachable component can be kept relatively stable by providing the third positioning hole and making it circumferentially fixedly connected with the second protrusion on the second cover.

A further preferred technical solution, its additional feature is that the detachable part includes a second detachable part, the second detachable part has a second plate body, the first side of the second plate body is equipped with a conical shell, and the conical shell The top of the body is connected with the second plate body, the fourth plate body is provided with a fourth annular groove, and the bottom of the conical shell is embedded in the fourth annular groove.

By inserting the conical shell on the second detachable part into the fourth annular groove on the fourth plate, the second detachable part can be reliably connected with the fourth plate, and through the fourth plate and the first The three-pipe body realizes the connection with the third detachable part. Thus, finally, the first detachable part, the second detachable part and the third detachable part are connected as a whole, and connected with the first cover and the second cover, so as to realize the measurement of each measurement module in the barrel. Reliable connection.

Another object of the present utility model is to provide a CT imaging system, including a scanner and any of the above CT image quality and radiation dose phantoms.

This CT imaging system has all the technical effects of the CT image quality and radiation dose phantoms described above.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is a schematic structural view of the CT image quality and radiation dose phantom of Embodiment 1 of the present invention, in which half of the cylinder is omitted in order to clearly show the three-dimensional shape of each component in the cylinder;

Fig. 2 is the sectional view of embodiment one;

Fig. 3 is a perspective view of the first detachable part in the first embodiment;

Fig. 4 is a schematic view of the first detachable part in Fig. 3 viewed from another angle;

Fig. 5 is a perspective view of a second detachable part in Embodiment 1;

Fig. 6 is a perspective view of the third detachable component in the first embodiment.

The meanings of the reference signs used in each embodiment are as follows: 11-first plate body; 12-first pipe body; 13-first through hole; 14-first positioning hole; 21-second plate body; 22 - conical shell; 31-third plate; 32-third pipe; 4-first cover; 41-first raised portion; 5-second cover; 51-second raised portion; 6-cylinder body; 7-the fourth plate body.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Embodiment one

As shown in Figures 1-6, the CT image quality and radiation dose phantom includes a cylinder 6 and a cover, the cover includes a first cover 4 and a second cover 5, and the first cover 4 and the second cover The bodies 5 are respectively covered on the two ends of the cylinder body 6 , and a plurality of detachable parts are detachably installed in the cylinder body 6 . Specifically, the shell diameter of the cylindrical body 6 is 110 mm. The size of the entire model completely simulates the length and diameter of the chest and abdomen of a 1-year-old child, and the entire phantom is filled with a water background, as a personalized phantom for infants and young children to optimize children's scanning parameters of different companies' CT. Each detachable part and the cylinder body 6, the first cover body 4, and the second cover body 5 can be quickly formed by polyurethane 3D printing.

By arranging the cylinder body 6, the first cover body 4, and the second cover body 5, and detachably setting detachable parts therein, water can be poured into the cylinder body 6 and the cover body, and the detachable parts can be used to simulate the human body. Internal organs such as bones, lungs, etc., realize the simulation of the body of infants and young children, so as to perform CT irradiation for infants and young children.

Specifically, the detachable part includes a first detachable part, and the first detachable part includes a first plate body 11, and a plurality of first pipe bodies 12 are installed on the first plate body 11, and the first plate body 11 is provided with A first through hole 13 penetrating with the hollow portion of the first pipe body 12 . Specifically, the number of first pipe bodies 12 is 6, and the 6 first pipe bodies 12 are evenly arranged on one side of the first plate body 11 along the circumference. The diameters of the 6 first pipe bodies 12 are the same, and can accommodate 12mm polystyrene bottle,

Mix dilute iodine contrast agent 270mgI/ml (Vision Parker) with different concentrations and physiological saline to form iodine contrast agent solutions with different concentrations, and inject them into 6 polystyrene bottles. The concentration of iodine is from 2.1 to 20.77 mg/ml (2.1 , 4.42, 8.71, 12.85, 16.87, 20.77mg I/ml) polystyrene bottles (10ml) closed and placed in the round holes in the above-mentioned phantom, each containing 10,25,50,100,150 and 200HU Simulation of different contrast agent concentrations.

By setting the first detachable part and setting the hollow first tube body 12 on the first detachable part, the first tube body 12 can be used to accommodate polystyrene bottles containing different contrast agents, so that the evaluation Signal-to-noise ratio and contrast-to-noise ratio of different concentrations in the water model background. Used to simulate enhanced abdominal vasculature.

More specifically, the detachable part includes a second detachable part, the second detachable part has a second plate body 21, a conical shell 22 is installed on the first side of the second plate body 21, and the top end of the conical shell 22 is It is connected with the second plate body 21, and the second side surface of the second plate body 21 is provided with six counterbore holes, and each first pipe body 12 is respectively inserted into one counterbore hole. Moreover, each counterbore can seal the bottom of the first pipe body 12, preventing the water in the cylinder body 6 from leaking into the first pipe body 12.

By setting the second detachable part, the hollow conical shell 22 on the second detachable part can be used to simulate the contrast of the lungs, and different objects such as sponges can be set in the hollow conical shell 22 to simulate the contrast of the lungs. Texture, which produces non-linear gradients in images, can be used to evaluate noise figure settings in automatic tube current modulation for CT.

By setting the counterbore on the second plate body 21 , it can be used to accept the polystyrene bottle placed in the first pipe body 12 . And adopt the first pipe body 12 and the second counterbore to jointly accommodate the mode of polystyrene bottle, can make the first pipe body 12 and the second counterbore separate, promptly the sidewall and the bottom of accommodation space separate, be beneficial to the first tube The cleaning of the first pipe body 12 avoids the generation of dirt in the first pipe body 12.

More specifically, the first cover 4 is provided with a first protrusion 41, the first plate 11 is provided with a first positioning hole 14, and the first protrusion 41 is inserted into the first position in a circumferentially fixed manner. Positioning hole 14. Specifically, the first protrusion 41 may be square, and the corresponding first positioning hole 14 may also be square. In addition, the edge forming the first positioning hole 14 may protrude from the first plate body 11 .

By providing the first positioning hole 14 and making it circumferentially fixedly connected with the first protrusion 41 on the first cover 4 , the first cover 4 and the first detachable component can be kept relatively stable.

Specifically, the detachable part includes a third detachable part, and the third detachable part includes a third plate body 31 on which a plurality of third pipe bodies 32 with different diameters are installed. Specifically, there may be ten third pipe bodies 32 , and the ten third pipe bodies 32 are evenly arranged on one side of the third plate body 31 along the circumference. The inner diameter of each third tube body 32 can be 1, 2, 3, ... 10mm respectively, and by putting different substances into each third tube body 32, it is possible to detect different inner diameters by setting a third plate body 31, so that third tube bodies 32 with different diameters are arranged on the third plate body 31, so that different tumor tissues can be placed. It is used to detect the image resolution of different internal diameters, and can also use the energy spectrum CT method to evaluate the effective atomic number and electron density of tumor tissue. The low-contrast resolution of CT is the ability to distinguish the smallest target when the contrast between the target and the background in the image is less than 1%. It is usually expressed by the size of the smallest object that can be distinguished and the corresponding contrast.

More specifically, the fourth plate body 7 is also included, and a plurality of fourth counterbores are arranged on the fourth plate body 7, and each third pipe body 32 can be inserted into one fourth counterbore.

The fourth plate body 7 is set, and the fourth counterbore can be used to block an open end of the third pipe body 32, so that both ends of the third pipe body 32 can be kept in an open state when cleaning, which is beneficial to the third pipe body 32. Cleaning of the three-tube body 32.

More specifically, the third pipe body 32 is installed on one side of the third plate body 31, the other side of the third plate body 31 is provided with a third positioning hole, and the second cover body 5 is provided with a third protrusion , the third protrusion can be inserted into the third positioning hole in a circumferentially fixed manner. Specifically, the third protrusion may be square, and the corresponding third positioning hole may also be square. The third positioning hole may be a through hole penetrating through the third plate body 31 .

By arranging the third positioning hole and making it fixedly connected with the second protrusion 51 on the second cover 5, the second cover 5 and the third detachable part can be kept relatively stable.

More specifically, the fourth plate body 7 is provided with a fourth annular groove, and the annular edge of the bottom of the conical housing 22 is embedded in the fourth annular groove.

By inserting the conical shell 22 on the second detachable part into the fourth annular groove on the fourth plate 7, the second detachable part can be reliably connected with the fourth plate 7, and through the fourth plate The body 7 and the third pipe body 32 realize the connection with the third detachable component. Thereby, the first detachable part, the second detachable part and the third detachable part are finally connected as a whole, and connected with the first cover 4 and the second cover 5, so as to realize the Reliable connection of the individual measurement modules.

The CT image quality and radiation dose phantoms of this embodiment can be rapidly prototyped based on 3D printing. The phantom can be used to evaluate the important evaluation indicators needed in children's examination: 1. Image contrast, 2. Automatic tube current modulation, 3. Spatial resolution of fine anatomical structures, which can optimize collimator width, noise index and reconstruction calculation purpose.

The action principle of this embodiment is:

Install the second cover body 5 on the bottom of the cylinder body 6 first. Then install the third detachable part on the second cover body 5, use the cooperation between the third protrusion and the third positioning hole to position the third detachable part, and inject the corresponding substance into the third tube body 32 . Then cover the fourth plate body 7 on the third tube body 32 , so that the fourth counterbore on the fourth plate body 7 is sleeved on the top of the third tube body 32 respectively. Then insert the bottom of the conical shell of the second detachable part into the annular groove of the fourth plate 7 , so that the second detachable part and the fourth plate 7 are relatively fixed. Then insert the first tube body 12 of the first detachable part into the counterbore of the second plate body 21, and put a polystyrene bottle into the first through hole 13 and the first tube body 12 to test the contrast , to evaluate the signal-to-noise ratio and contrast-to-noise ratio of different concentrations in the water model background. After pouring an appropriate amount of water into the barrel 6 , cover the first cover 4 so that the first protrusion 41 of the first cover 4 cooperates with the first positioning hole 14 to fix the first cover 4 .

Embodiment two

As shown in FIG. 5 , this embodiment provides a CT imaging system, including a scanner and any one of the above CT image quality and radiation dose phantoms.

This CT imaging system has all the technical effects of the CT image quality and radiation dose phantoms described above.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model.

In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features, for example:

(1) In Embodiment 1, the diameters of the third pipe body 32 are 1, 2, 3, 4-10 mm respectively, and the number is 10. In fact, the diameter and number of the third pipe body 32 can also be changed, and the number can be set as 8, the diameters are 1, 2, 3, 4-8mm in turn, basically can also complete the same function.

(2) In Embodiment 1, the first raised portion 41 and the first positioning hole 14 are both square, and the third raised portion and the third positioning hole are both square. In fact, each raised portion and the corresponding positioning The holes are not necessarily square, and in fact can also be made into other shapes, such as a regular hexagon or a regular octagon.

(3) In Embodiment 1, the first positioning is a counterbore, and the edge forming the counterbore protrudes from the first plate body 11. In fact, the first positioning hole 14 can also be a through hole, because each first tube body 12 is uniform are distributed on the circumference, so the positioning holes will not interfere with the first through hole 13 communicating with the first pipe body 12 .

However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims (9)

1.CT picture quality and dose of radiation body mould, which is characterized in that including cylinder and lid, the lid includes the first lid With the second lid, first lid and second lid cover the both ends for being located at the cylinder respectively, may be used also in the cylinder Multiple detachable parts are releasably installed；

The detachable part include the first detachable part, first detachable part include the first plate body, described first More first tube bodies are installed on plate body, first with the perforation of the hollow portion of first tube body is provided on first plate body Through-hole.

2. CT picture quality according to claim 1 and dose of radiation body mould, which is characterized in that the detachable part packet The second detachable part is included, second detachable part has the second plate body, and the first side of second plate body is equipped with The second side of conical shell, second plate body is equipped with multiple second counterbores, and each first tube body is inserted respectively into one In a second counterbore.

3. CT picture quality according to claim 1 and dose of radiation body mould, which is characterized in that set on first lid There is the first lug boss, first plate body is equipped with first positioning hole, and first lug boss is inserted into circumferentially fixed mode In the first positioning hole.

4. CT picture quality according to any one of claim 1-3 and dose of radiation body mould, which is characterized in that it is described can Dismantle component include the second detachable part, second detachable part have the second plate body, the first of second plate body Side is equipped with conical shell, and the conical shell top is connect with second plate body.

5. CT picture quality according to claim 1 and dose of radiation body mould, which is characterized in that the detachable part packet Third detachable part is included, the third detachable part includes third plate body, is equipped with multiple diameters on the third plate body Different third tube bodies.

6. CT picture quality according to claim 5 and dose of radiation body mould, which is characterized in that it further include the 4th plate body, 4th plate body is equipped with multiple 4th counterbores, and each third tube body is inserted into the 4th counterbore.

7. CT picture quality according to claim 5 or 6 and dose of radiation body mould, which is characterized in that the third tube body It is installed on the one side of the third plate body, the another side of the third plate body is provided with third location hole, second lid Third protrusion portion is provided on body, the third protrusion portion can be inserted into the third location hole in circumferentially fixed mode In.

8. CT picture quality according to claim 6 and dose of radiation body mould, which is characterized in that the detachable part packet The second detachable part is included, second detachable part has the second plate body, and the first side of second plate body is equipped with Conical shell, the conical shell top are connect with second plate body, and the 4th plate body is equipped with fourth annular groove, institute The bottom for stating conical shell is embedded in the fourth annular groove.

9. a kind of CT imaging system, which is characterized in that CT picture quality including any one of scanner and claim 1-8 and Dose of radiation body mould.