CN108771547B

CN108771547B - CT image quality and radiation dose phantom and CT imaging system

Info

Publication number: CN108771547B
Application number: CN201810768882.4A
Authority: CN
Inventors: 胡立伟; 钟玉敏; 曹少平; 宫海波; 毛茅
Original assignee: Shanghai Childrens Medical Center Affiliated to Shanghai Jiaotong University School of Medicine
Current assignee: Shanghai Childrens Medical Center Affiliated to Shanghai Jiaotong University School of Medicine
Priority date: 2018-07-13
Filing date: 2018-07-13
Publication date: 2024-02-09
Anticipated expiration: 2038-07-13
Also published as: CN108771547A

Abstract

The invention belongs to the technical field of instruments for radiodiagnosis, and particularly relates to a CT image quality and radiation dose phantom and a CT imaging system with the CT image quality and radiation dose phantom. The CT image quality and radiation dose phantom comprises a barrel and a cover body, wherein the cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are respectively arranged at two ends of the barrel in a covering mode, and a plurality of detachable components are detachably arranged in the barrel. The CT simulation device can solve the technical problem that CT simulation is difficult to be carried out on the body of an infant in the prior art.

Description

CT image quality and radiation dose phantom and CT imaging system

Technical Field

The invention belongs to the technical field of instruments for radiodiagnosis, and particularly relates to a CT image quality and radiation dose phantom and a CT imaging system with the CT image quality and radiation dose phantom.

Background

CT is an ionizing radiation, especially for infants in the growth phase, which infants are more susceptible to radiation. The data show that the dose of CT absorbed in the unit volume of the tissue of children is 10 times higher than that of adults, and tissue cells with vigorous metabolism are more sensitive to radiation; there is still dose accumulation effect, and the accumulated radiation quantity is larger than that of adults, so that other diseases, especially tumor, are easy to be induced.

The infant has special size, and the ratio of tissue in the body is different from that of an adult, so that the infant is a research hot spot for controlling the radiation dose at present and is a research difficult point. In daily work, CT inspectors control the influence of radiation dose on infants based on ALARA (as low dose as possible principle, as low as reasonably achievable) principle, but no scanning parameter standard of different CT inspection apparatuses is yet to be further optimized.

Disclosure of Invention

The invention aims to provide CT image quality and a radiation dose phantom so as to solve the technical problem that CT simulation on the body of an infant is difficult in the prior art.

The CT image quality and radiation dose phantom comprises a barrel and a cover body, wherein the cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are respectively arranged at two ends of the barrel in a covering mode, and a plurality of detachable components are detachably arranged in the barrel.

The CT image quality and radiation dose phantom has the beneficial effects that:

by providing the cylinder and the first and second covers, and detachably providing the detachable member therein, water can be poured into the cylinder and the covers, and organs such as bones, lungs, etc. inside the human body can be simulated by using the detachable member. The size of the whole model completely simulates the length and the diameter of the chest and the abdomen of a 1-year-old child, and the whole model is filled with water background and is used as a personalized infant model for optimizing the children scanning parameters of CT of different companies.

The preferable technical scheme is characterized in that the detachable component comprises a first detachable component, the detachable component comprises a first plate body, a plurality of first pipe bodies are arranged on the first plate body, and a first through hole communicated with the hollow part of the first pipe body is formed in the first plate body.

Through setting up first detachable part to set up hollow first body on first detachable part, can hold the polystyrene bottle that holds different contrast agents with first body, thereby can realize the signal to noise ratio and the contrast noise ratio's of different concentration contrast agent under the water mould background determination.

Further preferred technical scheme, its additional characterized in that can dismantle the part and include the second and can dismantle the part, the second can dismantle the part and have the second plate body, and the conical shell is installed to the first side of second plate body, and the second side of second plate body is equipped with a plurality of counter bores, and every first body inserts respectively in a counter bore.

The second plate body is provided with a counter bore which can be used for receiving the polystyrene bottle placed in the first pipe body. And adopt first body and second counter bore in order to hold the mode of polystyrene bottle jointly, can make first body and second counter bore separation, accommodation space's lateral wall and bottom separation promptly, do benefit to the washing of first body, avoid producing the dirt in the first body.

Further preferred technical scheme, its additional characterized in that is equipped with first bellying on the first lid, is equipped with first locating hole on the first plate body, and first bellying inserts in first locating hole with the mode of circumference fixed.

Through setting up first locating hole to make its and the fixed connection of first bellying circumference on the first lid, can make first lid and first detachable part keep relatively stable.

The preferred technical scheme is characterized in that the detachable component comprises a second detachable component, the second detachable component is provided with a second plate body, a conical shell is arranged on the first side surface of the second plate body, and the top end of the conical shell is connected with the second plate body.

By arranging the second detachable part, the hollow conical shell on the second detachable part can be used for simulating the contrast of the lung, and the hollow conical shell can be provided with the texture of the simulated lung such as sponge and the like, so that the image generates nonlinear gradient and can be used for evaluating the noise figure setting in the CT automatic tube current modulation.

The preferred technical scheme is characterized in that the detachable part comprises a third detachable part, the third detachable part comprises a third plate body, and a plurality of third pipe bodies with different diameters are arranged on the third plate body.

By arranging the third plate body to arrange third pipe bodies with different diameters on the third plate body, whether the third pipe bodies with different diameters can be distinguished by CT can be utilized to determine the capability of distinguishing the minimum target of CT scanning.

Further preferable technical scheme, the device is characterized by further comprising a fourth plate body, wherein a plurality of fourth counter bores are formed in the fourth plate body, and each third pipe body can be inserted into one fourth counter bore.

The fourth plate body is arranged, one opening end of the third pipe body can be plugged by the fourth counter bore, so that both ends of the third pipe body can be kept in an opening state during cleaning, and cleaning of the third pipe body is facilitated.

Further preferable technical scheme, its additional characterized in that, the third body is installed in a side of third plate body, and the another side of third plate body is provided with the third locating hole, is provided with the third bellying on the second lid, and the third bellying can be with the fixed mode of circumference inserts in the third locating hole.

By arranging the third positioning hole and enabling the third positioning hole to be fixedly connected with the second protruding portion on the second cover body in the circumferential direction, the second cover body and the third detachable component can be kept relatively stable.

Further preferred technical scheme, its additional characterized in that, detachable part includes the second and can dismantle the part, and the second is dismantled the part and is had the second plate body, and the conical shell is installed to the first side of second plate body, and conical shell top and second plate body coupling are equipped with the fourth annular groove on the fourth plate body, and the bottom of conical shell is embedded in the fourth annular groove.

By embedding the conical housing 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 the connection with the third detachable part is realized through the fourth plate and the third pipe. Therefore, the first detachable component, the second detachable component and the third detachable component are finally connected into a whole and are connected with the first cover body and the second cover body so as to realize reliable connection of each measuring module in the cylinder.

It is a further object of the present invention to provide a CT imaging system comprising a scanner and a CT image quality and radiation dose phantom of any of the above.

The CT imaging system has all the technical effects of CT image quality and radiation dose phantom.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a CT image quality and radiation dose phantom in accordance with a first embodiment of the invention, with half of the cylinder omitted so as to clearly show the three-dimensional appearance of the various components within the cylinder;

FIG. 2 is a cross-sectional view of the first embodiment;

FIG. 3 is a perspective view of a first detachable member in the first embodiment;

FIG. 4 is a schematic view of the first removable component of FIG. 3, viewed from another angle;

fig. 5 is a perspective view of a second detachable member in the first embodiment;

fig. 6 is a perspective view of a third detachable member in the first embodiment.

The reference numerals used in the respective embodiments denote the following meanings: 11-a first plate body; 12-a first tube; 13-a first through hole; 14-a first positioning hole; 21-a second plate; 22-a conical housing; 31-a third plate; 32-a third tube; 4-a first cover; 41-a first boss; 5-a second cover; 51-a second boss; 6, a cylinder; 7-fourth plate body.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

As shown in fig. 1 to 6, the CT image quality and radiation dose phantom includes a cylinder and a cover body, the cover body includes a first cover body and a second cover body, the first cover body and the second cover body are respectively provided at two ends of the cylinder, and a plurality of detachable components are detachably installed in the cylinder. Specifically, the diameter of the shell of the cylinder is 110mm. The size of the whole model completely simulates the length and the diameter of the chest and the abdomen of a 1-year-old child, and the whole model is filled with water background and is used as a personalized infant model for optimizing the children scanning parameters of CT of different companies. Each detachable part and barrel, first lid, second lid can be by polyurethane 3D printing rapid prototyping.

Through setting up barrel and first lid, second lid to detachably sets up detachable part therein, can pour into water in barrel and lid, can utilize detachable part to simulate organs such as skeleton, lung etc. of human inside, realize the simulation to infant's health, in order to carry out CT for the infant and shine.

Specifically, the detachable component comprises a first detachable component, the detachable component comprises a first plate body, a plurality of first pipe bodies are arranged on the first plate body, and a first through hole communicated with the hollow part of the first pipe bodies is formed in the first plate body. Specifically, the number of the first pipe bodies is 6, the 6 first pipe bodies are uniformly arranged on one side surface of the first plate body along the circumference, the diameters of the 6 first pipe bodies are the same, polystyrene bottles with the diameter of 12mm can be accommodated,

a polystyrene bottle (10 ml) containing diluted iodine contrast agent 270mgI/ml (wei pi g) with different concentrations and physiological saline to be mixed into iodine contrast agent solutions with different concentrations, and the iodine concentration ranging from 2.1 to 20.77 mg/ml (2.1,4.42,8.71, 12.85, 16.87, 20.77mg I/ml) was filled into 6 polystyrene bottles, and the polystyrene bottles were closed and placed into round holes in the body mold, each containing simulated different contrast agent concentrations of 10,25, 50, 100, 150 and 200 HU.

Through setting up first detachable part to set up hollow first body on first detachable part, can hold the polystyrene bottle that holds different contrast agents with first body, thereby can evaluate the signal to noise ratio and the contrast noise ratio of different concentration under the water mould background. To simulate an enhanced abdominal vascular structure.

Further specifically, the detachable component comprises a second detachable component, the second detachable component is provided with a second plate body, the first side face of the second plate body is provided with a conical shell, the top end of the conical shell is connected with the second plate body, the second side face of the second plate body is provided with 6 counter bores, and each first pipe body is inserted into one counter bore respectively. Moreover, each counter bore can seal the bottom of the first pipe body, and water in the cylinder is prevented from leaking into the first pipe body.

By arranging the second detachable part, the hollow conical shell on the second detachable part can be utilized to simulate the contrast of the lung, and different objects such as sponge and the like can be arranged in the hollow conical shell to simulate the texture of the lung, so that the image generates nonlinear gradient, and the method can be used for evaluating the noise index setting in CT automatic tube current modulation.

Further specifically, the first cover body is provided with a first protruding portion, the first plate body is provided with a first positioning hole, and the first protruding portion is inserted into the first positioning hole in a circumferentially fixed manner. Specifically, the first protruding portion may be square, and the corresponding first positioning hole may be a square hole. In addition, the edge of the first positioning hole may be formed to protrude from the first plate body.

Specifically, the detachable parts include a third detachable part including a third plate body on which a plurality of third pipe bodies having different diameters are mounted. Specifically, the number of the third pipe bodies can be 10, and the 10 third pipe bodies are uniformly arranged on one side surface of the third plate body along the circumference. The internal diameter of each third body can be 1,2,3, … … mm respectively, through putting into different substances in each third body, can detect the through setting up the third plate body under the condition of different internal diameters to set up the third body that the diameter is different on the third plate body, can put into different tumor tissue. The method is used for detecting the image resolution under the condition of different inner diameters, and can also be used for evaluating the effective atomic number and electron density of tumor tissues by using an energy spectrum CT method. The low contrast resolution of CT is the ability to resolve the smallest object when the contrast of the object in the image to the background is less than 1%. Typically expressed in terms of the size of the smallest target that can be distinguished and the corresponding contrast.

Further specifically, the novel pipe fitting further comprises a fourth plate body, a plurality of fourth counter bores are formed in the fourth plate body, and each third pipe body can be inserted into one fourth counter bore.

Further specifically, the third pipe body is installed in a side of the third plate body, the other side of the third plate body is provided with a third positioning hole, the second cover body is provided with a third protruding portion, and the third protruding portion can be inserted into the third positioning hole in a circumferentially fixed mode. Specifically, the third protruding portion may be square, and the corresponding third positioning hole may be a square hole. The third positioning hole may be a through hole penetrating through the third plate body.

Further specifically, the fourth plate body is provided with a fourth annular groove, and an annular edge of the bottom of the conical shell is embedded in the fourth annular groove.

The CT image quality and radiation dose phantom of this embodiment can be rapidly formed based on 3D printing. The phantom can be used for carrying out important evaluation indexes required in children examination: 1. image contrast, 2. Automatic tube current modulation, 3. Spatial resolution of fine anatomy, can reach the purpose of optimizing collimator width, noise figure and reconstruction calculation.

The action principle of the embodiment is as follows:

the second cover body is firstly arranged at the bottom of the cylinder body. The third removable component is then mounted to the second cover, positioned using the engagement of the third boss with the third positioning hole, and a corresponding substance is injected into the third tube. And then a fourth plate body is covered on the third pipe body, so that the fourth counter bores on the fourth plate body are respectively sleeved at the top end of the third pipe body. And then the bottom of the conical shell of the second detachable part is inserted into the annular groove of the fourth plate body, so that the second detachable part is relatively fixed with the fourth plate body. And then inserting the first pipe body of the first detachable part into the counter bore of the second plate body, and putting a polystyrene bottle into the first through hole and the first pipe body to test contrast so as to evaluate the signal-to-noise ratio and the contrast-to-noise ratio of different concentrations under the background of the water model. After pouring a proper amount of water into the cylinder, the first cover body is covered, so that the first protruding part of the first cover body is matched with the first positioning hole to fix the first cover body.

Example two

As shown in fig. 5, the present embodiment provides a CT imaging system including a scanner and a CT image quality and radiation dose phantom of any of the above.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

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

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be replaced equivalently, for example:

in a first embodiment, the diameters of the third pipe bodies are 1,2,3,4-10mm, the number is 10, the diameters and the number of the third pipe bodies can be changed actually, the number can be set to 8, the diameters are 1,2,3,4-8mm in sequence, and the same function can be basically completed.

In first embodiment, first bellying and first locating hole are square, and third bellying and third locating hole are square, and in fact each bellying and corresponding locating hole need not be square, can also make other shapes in fact, such as regular hexagon or regular octagon.

In the first embodiment, the first positioning holes are counter bores, edges of the counter bores protrude out of the first plate body, and actually the first positioning holes can also be through holes.

Such modifications and substitutions do not depart from the spirit of the invention.

Claims

The CT image quality and radiation dose phantom is characterized by comprising a barrel and a cover body, wherein the cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are respectively arranged at two ends of the barrel in a covering mode, water is filled among the barrel, the first cover body and the second cover body, and a plurality of detachable components are detachably arranged in the barrel;

the detachable component comprises a first detachable component, the first detachable component comprises a first plate body, a plurality of first pipe bodies are arranged on the first plate body, each first pipe body is used for accommodating polystyrene bottles with different contrast agent concentrations, and a first through hole which is communicated with the hollow part of the first pipe body is formed in the first plate body;

the detachable component comprises a second detachable component, the second detachable component is provided with a second plate body, a conical shell is arranged on the first side face of the second plate body, the conical shell is used for setting the texture of an object simulation lung so that the image generates a nonlinear gradient, a plurality of second counter bores are formed in the second side face of the second plate body, and each first pipe body is inserted into one second counter bore respectively.
2. The CT image quality and radiation dose phantom of claim 1, wherein the first cover has a first boss thereon, the first plate has a first locating hole therein, and the first boss is inserted into the first locating hole in a circumferentially fixed manner.
3. The CT image quality and radiation dose phantom of any of claims 1-2, wherein the detachable component comprises a second detachable component having a second plate with a conical shell mounted on a first side of the second plate, the conical shell top end being connected to the second plate.
4. The CT image quality and radiation dose phantom of claim 1, wherein the detachable member includes a third detachable member including a third plate having a plurality of third tubes of different diameters mounted thereon.
5. The CT image quality and radiation dose phantom of claim 4, further comprising a fourth plate having a plurality of fourth counterbores disposed thereon, each of the third tubes being insertable into one of the fourth counterbores.
6. The CT image quality and radiation dose phantom of claim 4 or 5, wherein the third tube is mounted 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, and the third protrusion can be inserted into the third positioning hole in a circumferentially fixed manner.
7. The CT image quality and radiation dose phantom of claim 5, wherein the detachable component comprises a second detachable component having a second plate with a conical shell mounted on a first side thereof, the conical shell top end being connected to the second plate, a fourth annular groove being provided on the fourth plate, the bottom of the conical shell being embedded in the fourth annular groove.
8. A CT imaging system comprising a scanner and the CT image quality and radiation dose phantom of any of claims 1-7.