CN215985814U

CN215985814U - Animal CT energy spectrum die body

Info

Publication number: CN215985814U
Application number: CN202122459126.3U
Authority: CN
Inventors: 徐探
Original assignee: Wuhan United Imaging Life Science Instrument Co Ltd
Current assignee: Wuhan United Imaging Life Science Instrument Co Ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-03-08
Anticipated expiration: 2031-10-12

Abstract

The utility model discloses an animal CT energy spectrum phantom, which comprises a main phantom, a test phantom and at least two kinds of testing parts. The main phantom and the test phantom can be used alone or in combination to simulate different to-be Research objectives, the interior of the main phantom is provided with a first installation position for detachably installing the test phantom and at least two second installation positions for detachably installing the test part, and at least two installation positions are arranged inside the test phantom. In the third installation position of the detachable installation test part. The test part in this application can be replaced, and by changing the test part of different materials, the requirements for materials such as high and low density tissues or organs can be met at the same time in energy spectrum research.

Description

Animal CT energy spectrum die body

Technical Field

The utility model relates to the technical field of medical equipment testing, in particular to an animal CT energy spectrum die body.

Background

CT energy spectrum research needs to be carried out by selecting material columns of different substances, but the material of the current die body is single and mainly used for image quality evaluation, and the current die body cannot be used for energy spectrum research; for example, micro-CT mold bodies and multi-energy mold bodies designed and manufactured by mainstream mold body manufacturers such as germany QRM, american CRIS and GAMMEX, wherein the micro-CT mold bodies only have two materials of hydroxyapatite and resin, can only perform characterization research on bone materials, and cannot meet the requirements of energy spectrum research on materials in different tissues or different positions in the same tissue at the same time.

In the prior art, the CT scanning geometric performance detection is carried out through the distribution of the steel balls in the energy spectrum die body, and the energy spectrum die body only studies two materials of the die body and the steel balls, so that the requirements on materials in different tissues or different positions in the same tissue during energy spectrum study cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide an animal CT energy spectrum phantom, which solves the technical problem in the prior art that the requirements for different tissues or materials at different positions in the same tissue during energy spectrum research cannot be met.

In order to achieve the technical purpose, the technical scheme of the utility model provides an animal CT energy spectrum die body which comprises a main die body, a test die body and at least two test parts, wherein the main die body and the test die body can be used independently or in combination for simulating different targets to be researched, a first mounting position for detachably mounting the test die body and at least two second mounting positions for detachably mounting the test parts are arranged in the main die body, and at least two third mounting positions for detachably mounting the test parts are arranged in the test die body.

In one embodiment of the present invention, the main mold body is provided with a first counterbore, the first counterbore constitutes the first mounting position, and the test mold body is slidably inserted into the first counterbore.

In one embodiment of the present invention, the main die body further defines at least two second counter bores, the second counter bores form the second mounting positions, the test die body defines a third counter bore, the third counter bore forms the third mounting position, and the test portion is slidably inserted into the second counter bores and/or the third counter bores.

In one embodiment, the first counterbore and the second counterbore each extend through the master mold body, and the third counterbore extends through the test mold body.

In one embodiment, the test portion is a contrast agent or equivalent material of the corresponding tissue of the object to be investigated.

In one embodiment, the master mould body is provided with a first mark for positioning, the test mould body is provided with a second mark for positioning, and the second mark is arranged opposite to the first mark.

In one embodiment, the master mold body is in the shape of an elliptical cylinder.

In one embodiment, the major axis of the master mould body is 40-80mm, and the minor axis of the master mould body is 30-60 mm.

In one embodiment, the test die body is a stepped column with a circular cross section, and the diameter of the large-diameter section of the test die body is 30-40 mm.

In one embodiment, the testing part is a stepped column with a circular section, and the diameter of the large-diameter section of the testing part is 0.5-8 mm.

In one embodiment, the inner wall of the large-diameter section of the first counter sink hole is in transitional connection with the end face of the main die body through a conical surface; the end surfaces of the main die body on the inner wall of the large-diameter section of the second counter sink are in transitional connection through a conical surface; and the inner wall of the large-diameter section of the third counter sink is in transitional connection with the end surface of the test die body through a conical surface.

Compared with the prior art, the utility model has the beneficial effects that: different positions can be simulated by the master mould body and the test mould body to be jointly used for CT energy spectrum research, through setting up detachable test portion, and connect test portion detachable in the master mould body or test mould body, through the test portion of selecting different materials, different contrast media or the attenuation characteristic of animal model self internal organization can be simulated to the test portion, select different test portions according to the research objective, both can be used for organizing material HU to scale, can study the degree of accuracy of energy spectrum material decomposition algorithm again, therefore convenient to use, the function is extensive.

Drawings

FIG. 1 is a perspective view of an animal CT spectrum phantom according to an embodiment of the present invention;

FIG. 2 is a schematic view of an orientation of an animal CT spectrum phantom according to an embodiment of the present invention;

fig. 3 is a sectional view taken along line a-a in fig. 2.

Reference numerals:

a master mould body 1;

first mounting position 1a

A second mounting location 1 b;

testing the die body 2;

a third mounting location 2 a;

a test section 3;

a first mark 4;

a second marking 5.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the utility model and together with the description, serve to explain the principles of the utility model and not to limit the scope of the utility model.

As shown in fig. 1 to 3, some embodiments of the present invention provide an animal CT spectroscopy phantom, which includes a main phantom 1, a test phantom 2 and at least two test parts 3.

The main die body 1 and the test die body 2 can be used independently or in combination for simulating different targets to be researched, a first installation position 1a for detachably installing the test die body 2 and at least two second installation positions 1b for detachably installing the test portion 3 are arranged in the main die body 1, and at least two third installation positions 2a for detachably installing the test portion 3 are arranged in the test die body 2. Through setting up first installation position 1a, realized the dismantled connection of main mould body 1 and test die body 2, main mould body 1 and test die body 2 can simulate different positions and be used for CT energy spectrum research jointly. By providing a detachable test portion 3 and detachably attaching the test portion 3 to the master phantom 1 or the test phantom 2, the test portion 3 can simulate the attenuation characteristics of different contrast agents or tissues within the animal model itself by selecting test portions 3 of different materials, and corresponding tissue equivalent materials can be selected based on the ICRU report 44 (tissue substitute in radiation dosimetry and measurement) and the ICRU report 46 (interaction data of photons, electrons, protons and neutrons with human tissue). Different test parts 3 are selected according to the target to be researched, so that the calibration method can be used for calibrating the tissue material HU (a measurement unit for measuring the density of a certain local tissue or organ of a human body), and can also be used for researching the accuracy of the energy spectrum substance decomposition algorithm, and therefore, the calibration method is convenient to use and wide in function.

The master model body 1 is made of plastic (such as polymethyl methacrylate) with the same water attenuation coefficient, the master model body 1 is in an elliptic cylinder shape, the long axis of the master model body 1 is 40-80mm, the short axis of the master model body 1 is 30-60mm, and the cross section size of the master model body 1 can be matched with the sizes of the thoracico-abdominal parts of mice and rats through the design of the shape and the size of the master model body 1.

It is understood that the master mold body 1 may have other shapes such as a circular shape, and the size and shape thereof may be designed as desired.

The main die body 1 is provided with a first counter sink and at least two second counter sinks, the first counter sink constitutes first installation position 1a, the first counter sink is located the central point of main die body 1 and sets up with main die body 1 is coaxial, the second counter sink constitutes second installation position 1b, the quantity of second counter sink is a plurality of, the second counter sink is parallel to each other with first counter sink and sets up along the circumference interval of main die body 1. Through setting up first counter sink and second counter sink, when inserting test die body 2 and test portion 3 respectively and locating first counter sink and second counter sink, can fixed test die body 2 and test portion 3.

Wherein, first counter sink and second counter sink can be the blind hole, also can all run through the upper and lower terminal surface of main die body 1, and in this embodiment, first counter sink and second counter sink all run through the upper and lower terminal surface of main die body 1. Through setting up first counter sink and second counter sink to run through master die body 1, when needs will test die body 2 and test portion 3 and take out in first counter sink and the second counter sink, can directly pour out test die body 2 and test portion 3 from the major diameter side of first counter sink and second counter sink, also can place whole animal CT energy spectrum die body level, use finger or soft rubber stick to push out partly from test die body 2 and test portion 3 from the path side of first counter sink and second counter sink, then grip and stretch out test die body 2 and test portion 3 of master die body 1 and take out test die body 2 and test portion 3.

In one embodiment, the number of the second countersunk holes is six, the six second countersunk holes are respectively arranged at two sides of the short axis of the main die body 1, the angular interval between three first countersunk holes positioned at one side of the short axis is 45 degrees, the diameter in the second countersunk hole is 0.5-8mm, and the depth of the second countersunk hole is 55-245 mm.

In one embodiment, the inner wall of the large-diameter section of the first countersunk hole is in transitional connection with the end face of the main mold body 1 through a conical surface; the end surfaces of the main die body 1 on the inner wall of the large-diameter section of the second counter sink are in transitional connection through conical surfaces; the end surfaces of the large-diameter section inner wall testing die body 2 of the third counter sink are in transitional connection through conical surfaces. Through the transition connection of the conical surface, the test die body 2 can be inserted into the first countersunk hole along the guide of the conical surface, so that the test die body 2 can be conveniently inserted into the first countersunk hole; through conical surface transitional coupling for test portion 3 can insert second counter sink or third counter sink along the direction of conical surface, and the test portion 3 of being convenient for inserts second counter sink and third counter sink.

In one of the embodiments, the master mould body 1 is provided with a first marking 4 for positioning.

In one embodiment, the first mark 4 is four mark lines disposed at one end of the main body 1, and the four mark lines are disposed in a cross shape and the intersection point is located at the center of the main body 1.

The test die body 2 is slidably detachably mounted at the first mounting position 1 a.

In one embodiment, the test die body 2 is made of plastic (such as polymethyl methacrylate) with the same water attenuation coefficient, the test die body 2 is a stepped column with a circular cross section, the diameter of the large-diameter section of the test die body 2 is 30-40mm, the test die body 2 is matched and slidably inserted in the first counter bore, the test die body 2 is provided with a third counter bore, the third counter bore forms a third mounting position 2a, and the third counter bore penetrates through the upper end face and the lower end face of the test die body 2. Through the shape and the size to test die body 2 design for test die body 2 can cooperate to insert and locate behind the first counter sink can directly install in main die body 1 and can not drop, can also simulate the head size of mouse or rat.

It will be appreciated that the test phantom 2 may take other shapes and may be dimensioned as desired.

In one embodiment, the third counter bores are arranged coaxially with the test die body 2, the number of the third counter bores is six, one of the third counter bores is located in the center of the test die body 2, the other five third counter bores are evenly distributed along the circumferential direction of the test die body 2, and the distance from the five peripheral third counter bores to the center of the test die body 2 is 2-12 mm.

In one of the embodiments, the test phantom 2 is provided with a second marking 5 for positioning, and the second marking 5 is arranged opposite the first marking 4.

In one embodiment, the second mark 5 is three mark lines disposed at one end of the test mold body 2, the three mark lines are disposed in a T shape, and the intersection point of the three mark lines is located at the center of the test mold body 2. Through setting up first mark 4 and second mark 5, can realize not changing of master die body 1 and the relative position of test die body 2, realize the location of test die body 2 relative master die body 1.

The testing part 3 is slidably detachably mounted at the second mounting position 1b and/or the third mounting position 2 a. The detachable installation is realized through slidingtype to test portion 3, and when test portion 3 need be changed, the test portion 3 can be slided, is convenient for change.

The test part 3 can be a test body containing different contrast agents or a test body simulating the attenuation characteristics of the internal tissues of the animal model, corresponding tissue equivalent materials can be selected according to ICRU reports 44 and 46, different materials can be selected and replaced by the test part 3 according to different research targets, the HU calibration device can be used for HU calibration of tissue materials, the accuracy of a spectral material decomposition algorithm can be researched, and therefore the HU calibration device is convenient to use and wide in function.

In one embodiment, the number of the test portions 3 is plural, the test portions 3 are contrast agents or equivalent materials of corresponding tissues of the object to be studied, the test portions 3 have a stepped columnar shape, and the test portions 3 are fittingly and slidably inserted into the second counter bore and/or the third counter bore. The number of the test parts 3 is set to be multiple, and the multiple test parts 3 can be respectively inserted into the second counter bore or the third counter bore, so that the main mold body 1 and the test mold body 2 can be combined with the test parts 3 made of multiple materials to simultaneously perform CT energy spectrum research. Through setting up test portion 3 into the ladder column, after test portion 3 inserts and locates second counter sink or third counter sink, in being the columnar test portion 3 of ladder and being fixed in second counter sink or third counter sink, test portion 3 is fixed for master model body 1 or test model body 2, can not drop from master model body 1 or test model body 2, has realized that test portion 3 and master model body 1 or test model body 2 can dismantle and be connected.

It will be appreciated that the test portion 3 may also take other shapes, such as cylindrical, prismatic, etc.

The specific working process of the utility model is as follows:

when the master mould body 1 is used alone, at least two testing parts 3 are inserted into the second countersunk holes in the master mould body 1, the master mould body 1 containing the replaceable testing parts 3 is tested, the master mould body 1 can be used for simulating the abdomen of a mould animal, the trunk of the animal, organs, tissues and certain components of the tissues, in the embodiment, the master mould body 1 is used for simulating the abdomen of the animal, and the testing parts 3 are used for simulating the tissues in the abdomen or the radiography distribution of different regions in the abdomen.

When the test die body 2 is used alone, at least two test parts 3 are inserted into the third countersunk holes on the test die body 2, the test die body 2 containing the replaceable test parts 3 is tested, the test die body 2 can be used for die body animals, the trunk of the animals, organs, tissues and certain components of the tissues, and the like, in the embodiment, the test die body 2 is used for simulating the head of the animals, and the test parts 3 are used for simulating the tissues in the head or the radiography distribution of different regions in the head.

When the main die body 1 and the test die body 2 are combined, the test die body 2 is inserted into a first countersunk hole of the main die body 1, the test part 3 is respectively inserted into a second countersunk hole and/or a third countersunk hole, the main die body 1 is used for simulating the abdomen of an animal, the test part 3 and the test die body 2 can simulate tissues in the abdomen or contrast distribution of different regions in the abdomen, and the test part 3 in the test die body 2 can simulate different tissues, tissues in different installation positions in the abdomen and contrast distribution of different regions in the abdomen. The primary die body 1 is also provided with a first counterbore for receiving a commercially available die body.

When the testing die body 2 extends into the main die body 1, the main die body 1 of the testing die body 2 can simultaneously simulate the head to the abdomen of an animal, and the testing part 3 can simulate the tissues in the head and the abdomen of the animal.

Aligning the master phantom 1 with the test phantom 2 through a first mark 4 and a second mark 5, and then using the assembled animal CT energy spectrum phantom for CT energy spectrum research; the test part 3 made of different materials can be replaced according to the needs, the three-dimensional size of the whole animal CT energy spectrum die body is matched with the size of the researched animal model, the capability of simulating the sizes of the head, the chest and the abdomen is realized, and the characteristic of easy replacement of material attributes can help to research the energy spectrum attenuation characteristics of different contrast agents or the internal tissues of the animal model and the verification of a material decomposition algorithm, so the use is convenient, and the function is wide.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an animal CT energy spectrum die body, characterized in that, includes master die body (1), test die body (2) and two kind at least test portions (3), master die body (1) and test die body (2) all can use alone or the combined use is in order to be used for simulating different target of studying of waiting, the inside of master die body (1) is provided with and is used for demountable installation first installation position (1a) and at least two of test die body (2) are used for demountable installation second installation position (1b) of test portion (3), the inside of test die body (2) is provided with at least two and is used for demountable installation third installation position (2a) of test portion (3).

2. The animal CT phantom according to claim 1, wherein said main phantom (1) is provided with a first counter bore, said first counter bore forming said first mounting location (1a), said testing phantom (2) being slidably inserted into said first counter bore.

3. The animal CT spectrogram phantom according to claim 2, wherein said main phantom (1) further comprises at least two second counter bores, said second counter bores forming said second mounting position (1b), said testing phantom (2) further comprises a third counter bore, said third counter bore forming said third mounting position (2a), and said testing part (3) is slidably inserted into said second counter bores and/or said third counter bores.

4. The animal CT spectroscopy phantom according to claim 3, wherein said first and second counter bores each extend through said master phantom (1) and said third counter bore extends through said test phantom (2).

5. The animal CT spectroscopy phantom according to claim 3, wherein said test portion (3) is a contrast agent or equivalent material of the corresponding tissue of the object to be studied.

6. The animal CT spectroscopy phantom according to any one of claims 1 to 5, wherein said master phantom (1) is provided with a first marker (4) for positioning, said test phantom (2) is provided with a second marker (5) for positioning, and said second marker (5) is arranged opposite to said first marker (4).

7. The animal CT spectroscopy phantom according to any of claims 1 to 5, wherein said master phantom (1) is of an elliptic cylindrical shape.

8. The animal CT spectroscopy phantom according to claim 7, wherein said master phantom (1) has a major axis of 40-80mm and a minor axis of 30-60 mm.

9. The animal CT spectroscopy phantom according to claim 7, wherein said test phantom (2) is a stepped column with a circular cross-section, and the diameter of the large diameter section of said test phantom (2) is 30-40 mm.

10. The animal CT spectroscopy phantom according to claim 7, wherein said test portion (3) is a stepped column with a circular cross-section, and a diameter of a large diameter section of said test portion (3) is 0.5-8 mm.

11. The animal CT spectrum phantom according to claim 3, wherein the inner wall of the large diameter section of the first counter bore is transitionally connected with the end surface of the main phantom (1) through a conical surface; the end surfaces of the main die body (1) on the inner wall of the large-diameter section of the second counter sink are in transitional connection through a conical surface; the inner wall of the large-diameter section of the third counter sink is in transitional connection with the end face of the test die body (2) through a conical surface.