Emission imaging auxiliary device and emission imaging system

Abstract

The utility model provides an emission imaging auxiliary device and an emission imaging system. The emission imaging auxiliary device comprises a fixing plate body and a shielding piece, the fixing plate body is provided with a first area and a second area adjacent to the first area, and the shielding piece covers the second area to block radiation rays and expose the first area. By arranging the shielding piece, the target detection part of the living body is exposed in the detection space, the influence of other parts on imaging of the target detection part is avoided, the imaging quality of the target detection part is further guaranteed, and the structure and the function of the target detection part are displayed more clearly and more visually.

Description

Technical Field

[0001] The utility model relates to the technical field of medical imaging, in particular to an emission imaging auxiliary device and an emission imaging system. Background Art

[0002] Positron Emission Tomography (PET) is an advanced nuclear medicine imaging technology that visualizes metabolic processes and detects biological information in the body by detecting radioactive decay signals of radioactive tracers in the body. PET technology is widely used in early diagnosis and progression monitoring of diseases. It also helps to gain a deeper understanding of the occurrence and development of diseases, explore new treatments, and provide useful information for clinical diagnosis and treatment. In addition, PET technology is also a powerful tool for drug efficacy evaluation and new drug development, and plays an important role in biomedical research.

[0003] PET technology is of great significance in the study of the structure and function of the nervous system. Brain PET images can be used to visualize the expression of brain genes and protein receptors, as well as the distribution and activity of neurotransmitters, to study the functional connections of different brain regions and the development of neurodegenerative diseases. Some programs use PET technology to study the ligand suitability of various probes in the living brain, the various pharmacological characteristics of glutamate receptors in the brain, and the core role of glutamatergic neurotransmission in brain function. PET technology also plays an important role in drug development and evaluation. Researchers can use PET technology to track the distribution and metabolism of radioactive tracers or drugs in the brain, thereby evaluating the absorption, distribution, metabolism and excretion characteristics of drugs, which helps to optimize drug design and dosage.

[0004] In the field of basic scientific research, there are some shortcomings in using whole-body PET instruments to scan the mouse head. Most PET drugs are injected intravenously into the mouse body to exert their effects. PET drugs accumulate in metabolic organs such as the liver, kidneys, and bladder through the bloodstream, and their brain uptake is limited, which interferes with the imaging of the mouse brain to a certain extent, resulting in poor quality of the mouse brain image and an inability to intuitively display the mouse brain structure and function. Utility Model Content

[0005] In order to at least partially solve the problems existing in the prior art, according to one aspect of the utility model, an emission imaging auxiliary device is provided. The emission imaging auxiliary device comprises: a fixed plate body, the fixed plate body having a first area and a second area adjacent to the first area; and a shielding member, the shielding member covers the second area to block radiation rays and exposes the first area.

[0006] Exemplarily, the shielding member includes a first portion and a second portion, the first portion and the second portion are located on opposite sides of the fixed plate body and are abutted and connected, and the second area is located between the first portion and the second portion.

[0007] Exemplarily, the shielding member is slidable in a first direction relative to the fixed plate body, and the first area is exposed during the sliding process of the shielding member relative to the fixed plate body.

[0008] Exemplarily, the fixed plate body is provided with slide grooves on two opposite sides in the second direction, the slide grooves extend along the first direction and the shielding member slides in the slide grooves, and the second direction and the first direction meet a perpendicular condition.

[0009] Exemplarily, the fixed plate body forms limiting end surfaces at opposite ends of the slide groove, and the limiting end surfaces abut against the second portion to form a limiting shielding member.

[0010] Exemplarily, the first portion is semi-cylindrical in shape.

[0011] Exemplarily, one end of the first portion close to the first region has a first inclined surface, and the first inclined surface is inclined from the inside to the outside in a direction away from the first region.

[0012] Exemplarily, the outer diameter of the first portion is between 56 mm and 60 mm.

[0013] Exemplarily, the inner diameter of the first portion is between 36 mm and 40 mm.

[0014] Exemplarily, the length of the first portion is between 50 mm and 70 mm.

[0015] Exemplarily, the second part is a trapezoidal semi-cylinder and a mounting cavity is formed on a side facing the fixed plate body, and a partial structure of the fixed plate body is located in the mounting cavity.

[0016] Exemplarily, one end of the second portion close to the first region has a second inclined surface, and the second inclined surface is inclined along a direction away from the first region toward a direction away from the first portion.

[0017] Exemplarily, the outer diameter of the second portion is between 69 mm and 73 mm.

[0018] Exemplarily, the inner diameter of the second portion is between 49 mm and 53 mm.

[0019] Exemplarily, the length of the second portion is between 50 mm and 60 mm.

[0020] Exemplarily, a head stopper is provided in the first area.

[0021] Exemplarily, the shielding member is a lead material member, or the shielding member is a tungsten material member.

[0022] According to another aspect of the utility model, an emission imaging system is also provided, which comprises an equipment body and any one of the emission imaging auxiliary devices described above, wherein the emission imaging auxiliary device is installed on the body.

[0023] The emission imaging auxiliary device provided in the present application, by setting a shielding part, exposes the target detection part of the biological body to the detection space and avoids the influence of other parts on the imaging of the target detection part, thereby further ensuring the imaging quality of the target detection part and displaying the structure and function of the target detection part more clearly and intuitively.

[0024] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the detailed implementation section. The utility model content section is not intended to limit the key features and essential technical features of the technical solution claimed for protection, nor is it intended to determine the scope of protection of the technical solution claimed for protection.

[0025] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention. In the drawings,

[0027] Figure 1 is a perspective view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0028] Figure 2 is a perspective view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0029] Figure 3 is a side view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0030] Figure 4 is a perspective view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0031] Figure 5 is a side view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0032] Figure 6 is a perspective view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0033] Figure 7 is a side view of an emission imaging auxiliary device according to an exemplary embodiment of the utility model;

[0034] Figure 8 is a side view of an emission imaging auxiliary device according to an exemplary embodiment of the present utility model; and

[0035] Fig. 9 The figure is an exploded view of a transmission imaging auxiliary device according to an exemplary embodiment of the present utility model.

[0036] The above drawings include the following reference numerals:

[0037] 10. Emission imaging auxiliary device; 110. Fixed plate; 1101. First area; 1102. Second area; 1110. Slide groove; 1120. Limit end surface; 1130. Head limiter; 120. Shielding member; 1210. First part; 1211. First inclined surface; 1220. Second part; 1221. Second inclined surface; 1222. Installation cavity. DETAILED DESCRIPTION

[0038] In the following description, a large number of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only illustrates preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail.

[0039] In order to thoroughly understand the implementation of the utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred implementation of the utility model is described in detail below, but in addition to these detailed descriptions, the utility model can also have other implementations.

[0040] In an embodiment of the utility model, an emission imaging auxiliary device is provided. The emission imaging auxiliary device can be applied to an emission imaging system. Exemplarily, the emission imaging auxiliary device can be applied to an emission imaging system. For example, the emission imaging auxiliary device can be applied to a PET imaging system.

[0041] The working process of the PET imaging system generally includes: injecting tracers containing radioactive substances (glucose, oxygen, neurotransmitters, etc.) into the body. These radioactive tracers will be absorbed by the target organs and tissues due to some specific molecular structures. When the nuclides in the radioactive tracers decay, the positrons released will meet the electrons in the body and annihilate each other, generating a pair of gamma photons in opposite directions, which will be detected by the working detector and converted into electrical signals. Finally, the reconstruction of the image is completed according to the reconstruction algorithm of the processor module. This nuclear medicine imaging technology is a dynamic and functional imaging technology that can observe information such as the metabolism and blood flow status of organs.

[0042] Combined with reference Figure 1 , 2 9, the emission imaging auxiliary device 10 may include a fixed plate 110 and a shielding member 120. Among them, the fixed plate 110 can be used to place the organism. The size of the fixed plate 110 can be set accordingly according to the organism. In the field of basic scientific research, the organism is usually a mouse, and the size of the fixed plate 110 and the size of the emission imaging auxiliary device 10 can be set corresponding to the mouse. The fixed plate 110 may have a first area 1101 and a second area 1102 adjacent to the first area 1101. The shielding member 120 can cover the second area 1102 to block the radiation and expose the first area 1101. When the emission imaging auxiliary device 10 is applied to an imaging system, the portion of the organism in the first area 1101 can be exposed to the detection space of the imaging system and imaged. The portion of the organism in the second area 1102 is covered by the shielding member 120 to avoid being detected. It can be understood that the first area 1101 and the second area 1102 can be defined by the shielding member 120 , the portion covered by the shielding member 120 is the second area 1102 , and the portion exposed to the shielding member 120 is the first area 1101 .

[0043] It is understandable that in the illustrated embodiment, both the first area 1101 and the second area 1102 are one. In an embodiment not shown, the number of the first area and the second area can be set according to actual conditions. For example, there is one second area, and there are two first areas, which are respectively located on both sides of the second area. The setting of the first area 1101 and the second area 1102 mainly depends on the part to be detected. When the target detection part is the head, the first area 1101 and the second area 1102 are both one, the head is in the first area 1101, and other parts of the body are in the second area 1102. The part in the second area 1102 can be shielded by the shielding member 120.

[0044] The shielding member 120 can be made of any material that can block radiation rays. The shielding member 120 can interact with gamma photons and intercept the detector from detecting gamma photons. Taking the target detection part as the head as an example, the head in the first area 1101 is exposed, and the detector can detect gamma photons to generate brain imaging. The rest of the body is in the second area 1102, and the shielding member 120 can intercept the gamma photons generated by the detector detecting the rest of the body, that is, avoiding the influence of the metabolic organs in other parts on brain imaging. After shielding the influence of the metabolic organs in other parts on brain imaging, you can also try to appropriately increase the dose of the injected drug to improve the image quality of brain imaging.

[0045] The emission imaging auxiliary device 10 provided in the present application, by setting a shielding member 120, exposes the target detection part of the biological body to the detection space and avoids the influence of other parts on the imaging of the target detection part, thereby further ensuring the imaging quality of the target detection part and displaying the structure and function of the target detection part more clearly and intuitively.

[0046] For example, in conjunction with reference Figure 6 and 9 , the shielding member 120 may include a first portion 1210 and a second portion 1220. The first portion 1210 and the second portion 1220 may be located on opposite sides of the fixed plate body 110 and connected in abutment, and the second region 1102 may be located between the first portion 1210 and the second portion 1220. The first portion 1210 and the second portion 1220 may be located on the upper and lower sides of the fixed plate body 110, respectively. The first portion 1210 and the second portion 1220 may more completely enclose the second region 1102, thereby better blocking the radiation rays in the second region 1102, and further ensuring the imaging quality of the target detection part. The first portion 1210 may be rotatably arranged relative to the second portion 1220, and the first portion 1210 may be rotated to open the first portion 1210, so that the organism is in the second region 1102, and then the first portion 1210 is covered. In some embodiments, the shielding member may be an integral member.

[0047] For example, in conjunction with reference Figure 7 and 8, the shielding member 120 can slide in the first direction XX relative to the fixed plate 110, and the first area 1101 can be exposed during the sliding process of the shielding member 120 relative to the fixed plate 110. It can be understood that during the sliding process of the shielding member 120 relative to the fixed plate 110, the first area 1101 increases or decreases accordingly. Among them, the first direction XX can be the length direction of the fixed plate 110, and can also be the length direction of the organism. It can be understood that the length of the organism is different, and the length of the corresponding target detection part is also different. The shielding member 120 is slidably arranged relative to the fixed plate 110, and the length of the first area 1101 can be adjusted by sliding the shielding member 120, so that the target detection part is more accurately exposed, and the parts other than the target detection part are better blocked. The emission imaging auxiliary device 10 configured in this way can better adapt to organisms of different sizes and ensure the imaging quality of the target detection part. Among them, Figure 7 The shield 120 is shown positioned relative to Figure 8 The shield 120 is shown positioned closer to the left. Figure 7 The length of the first region 1101 in the shielding member 120 is smaller. For example, the movable length range of the shielding member 120 in the first direction XX is within 15 mm, that is, the shielding member 120 is Figure 7 The position shown in Figure 8 The length of the position movement shown in FIG. 1 is 15 mm. With such arrangement, the emission imaging auxiliary device 10 can be applied to most organisms.

[0048] For example, refer to Fig. 9 , the fixed plate body 110 may be provided with slide grooves 1110 on opposite sides in the second direction YY, the slide grooves 1110 may extend along the first direction XX and the shielding member 120 may slide in the slide grooves 1110, and the second direction YY and the first direction XX may meet a perpendicular condition. The second direction YY may be the width direction of the fixed plate body 110. In this way, the slide grooves 1110 on both sides may better define the sliding track of the shielding member 120, making the sliding process of the shielding member 120 more controllable and stable.

[0049] For example, continue to refer to Fig. 9 The fixed plate body 110 can form limiting end faces 1120 at both opposite ends of the slide groove 1110, and the limiting end faces 1120 and the second portion 1220 abut against the limiting shielding member 120. In this way, when the shielding member 120 slides relative to the fixed plate body 110, the limiting position of the shielding member 120 is limited by the abutment between the end face of the shielding member 120 and the two limiting end faces 1120. The limiting position of the movement of the shielding member 120 is limited, and the sliding of the shielding member 120 is further controlled.

[0050] For example, refer to Figure 1 ,2 , 4 and 9, the first part 1210 can be semi-cylindrical. The organism can be placed in the semi-cylindrical hollow part. In this way, the shielding member 120 can better adapt to the outer contour of the organism, ensure the shielding member 120 to block the radiation rays, and further ensure the imaging quality of the target detection part.

[0051] For example, refer to Figure 6 and 7 , one end of the first part 1210 close to the first area 1101 may have a first inclined surface 1211, and the first inclined surface 1211 may be inclined from the inside to the outside in a direction away from the first area 1101. In this way, it is prevented that the partial structure of the target detection part close to the first part 1210 is blocked by the first part 1210 itself, thereby ensuring the integrity of the imaging of the target detection part. In an embodiment not shown, the plane where the end surface of the first part close to the first area is located may be perpendicular to the fixed plate.

[0052] For example, refer to Figure 6 and 9 , the outer diameter of the first part 1210 can be between 56 mm and 60 mm. In this way, the size of the emission imaging auxiliary device 10 can be more suitable for most emission imaging systems. Further, the outer diameter of the first part 1210 can be 58 mm.

[0053] For example, refer to Figure 6 and 9 , the inner diameter of the first part 1210 can be between 36 mm and 40 mm. Further, the inner diameter of the first part 1210 can be 38 mm. In this way, the size of the internal space of the shielding member 120 can be adapted to the size of the organism. In particular, when the organism is a mouse, the size of such a shielding member 120 is more adapted to the mouse. Of course, in an embodiment not shown, the inner diameter of the first part can be set differently according to different organisms.

[0054] For example, refer to Figure 6 and 9 The thickness of the first portion 1210 may be between 15 mm and 30 mm. Preferably, the thickness of the first portion 1210 may be 20 mm.

[0055] For example, refer to Figure 6 and 9 The length of the first part 1210 may be between 50 mm and 70 mm. Preferably, the length of the first part 1210 may be 60 mm. In this way, the length of the shielding member 120 is adapted to the length of the organism. In particular, when the organism is a mouse, the length of the shielding member 120 is more adapted to the mouse.

[0056] For example, refer to Fig. 9 The second part 1220 is a trapezoidal semi-cylinder and a mounting cavity 1222 may be formed on the side facing the fixed plate body 110, and a part of the structure of the fixed plate body 110 is located in the mounting cavity 1222. The arrangement of the mounting cavity 1222 makes the contact surface between the second part 1220 and the fixed plate body 110 larger, and the position of the shielding member 120 relative to the fixed plate body 110 is more stable.

[0057] For example, refer to Figure 4-9 , the second portion 1220 has a second inclined surface 1221 at one end close to the first region 1101, and the second inclined surface 1221 is inclined from the direction away from the first region 1101 to the direction away from the first portion 1210. In this way, it is prevented that the partial structure of the target detection part close to the second portion 1220 is blocked by the second portion 1220 itself, thereby ensuring the integrity of the imaging of the target detection part. In an embodiment not shown, the plane where the end surface of the second portion close to the first region is located can be perpendicular to the fixed plate.

[0058] For example, refer to Figure 6 and 9 , the outer diameter of the second part 1220 can be between 69 mm and 73 mm. In this way, the size of the emission imaging auxiliary device 10 can be more suitable for most emission imaging systems. Further, the outer diameter of the second part 1220 can be 71 mm.

[0059] For example, refer to Figure 6 and 9 , the inner diameter of the second part 1220 can be between 49 mm and 53 mm. Further, the inner diameter of the second part 1220 can be 51 mm. In this way, the size of the internal space of the emission imaging auxiliary device 10 can be adapted to the size of the organism. In particular, when the organism is a mouse, the size of such an emission imaging auxiliary device 10 is more adapted to the mouse. Of course, in an embodiment not shown, the inner diameter of the second part can be set differently according to different organisms.

[0060] For example, refer to Figure 6 and 9 The thickness of the second part 1220 may be between 15 mm and 30 mm. Preferably, the thickness of the second part 1220 may be 20 mm. Furthermore, the thickness of the second part 1220 may be the same as the thickness of the first part 1210, so that the shielding effect of each part of the shielding member 120 is closer.

[0061] For example, refer to Figure 6 and 9, the length of the second part 1220 can be between 50 mm and 60 mm. Preferably, the length of the second part 1220 can be 60 mm. In this way, the length of the shielding member 120 is adapted to the length of the organism. In particular, when the organism is a mouse, the length of such a shielding member 120 is more adapted to the mouse. Further, the length of the second part 1220 can be the same as the length of the first part 1210.

[0062] For example, refer to Figure 5 and 6 , the first area 1101 may be provided with a head stopper 1130. The head stopper 1130 may be used to fix the head of the organism. Specifically, the head stopper 1130 may be a cylindrical structure, and the mouth of the organism may be inserted into the interior of the cylindrical structure and fixed. By setting the head stopper 1130, the organism may be placed in a corresponding position, so that the target detection part in the first area 1101 may be better detected, and the part in the second area 1102 may be better shielded. When applied to a transmission imaging system, the position of the head stopper 1130 may be set so that the head of the organism is placed in the center of the scanning bed during scanning. The resolution and sensitivity in the center are the highest, so that the accuracy of head imaging may be higher.

[0063] Exemplarily, the emission imaging auxiliary device 10 may further include an outer shell, and the fixing plate 110 and the shielding member 120 may both be disposed in the outer shell.

[0064] For example, the shielding member 120 may be made of a lead material, or may be made of a tungsten material. In this way, the shielding member 120 can block the radiation rays.

[0065] Taking the shield 120 as a lead material as an example, the working principle of the shield 120 can be understood as follows: the interaction between gamma photons and lead materials is mainly achieved through a variety of processes, the most important of which is the photoelectric effect. In the photoelectric effect, gamma photons interact with electrons in lead, transferring energy to electrons and causing them to break away from atoms. This causes the energy of gamma photons to be absorbed and electron and positron pairs to be generated inside the material. Another interaction is Compton scattering. In Compton scattering, gamma photons interact with electrons in lead, causing gamma photons to change direction and lose some energy. Although Compton scattering causes gamma photons to escape from the material, the high density of lead makes the probability of Compton scattering less, thereby reducing the number of escaping photons. In the photoelectric effect and Compton scattering, electron and positron pairs are generated between gamma photons and lead atoms. These positrons annihilate when interacting with surrounding matter, generating two gamma photons. These additional gamma photons propagate inside the material and are eventually absorbed. In addition, lead, as a high-density material, has a strong radiation absorption capacity, especially for high-energy radiation such as X-rays and gamma photons. When radiation rays pass through the lead shield, the atomic nuclei in the lead will interact with the radiation, so that the radiation energy is converted into electron energy, heat energy, etc., thereby reducing the spread of radiation. In summary, lead can effectively absorb and scatter gamma photons, thereby reducing the energy and intensity of gamma photons. The high density and high absorption capacity of lead also make it a commonly used material for shielding gamma photons to protect people and the environment from the hazards of radiation.

[0066] According to another aspect of the utility model, a transmission imaging system is also provided. The transmission imaging system may include a device body and any one of the above-mentioned transmission imaging auxiliary devices 10. The transmission imaging auxiliary device 10 is installed on the device body. Since the transmission imaging auxiliary device 10 adopts the technical solution of any one of the above-mentioned embodiments, the transmission imaging system at least has the beneficial effects brought by the technical solution of the above-mentioned embodiments, which will not be repeated here. The transmission imaging auxiliary device 10 and the device body can be connected by any structure. Exemplarily, the transmission imaging auxiliary device 10 is detachably mounted on the device body. The device body may include a scanning bed. It can be understood that the transmission imaging auxiliary device 10 can limit the position of the organism, so that the transmission imaging auxiliary device 10 and the device body can be reasonably set so that the target detection part of the organism is in the center of the scanning bed. The resolution and sensitivity at the center are the highest, which can make the imaging accuracy of the target detection part higher.

[0067] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contours of each component itself.

[0068] For ease of description, regional relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0070] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0071] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A transmission imaging auxiliary device, characterized in that: include: A fixed plate body, the fixed plate body having a first area and a second area adjacent to the first area; as well as a shielding member, the shielding member covering the second area to block radiation rays and exposing the first area; The shielding member includes a first part and a second part, the first part and the second part are located at opposite sides of the fixing plate and are connected together, and the second area is located between the first part and the second part.

2. The emission imaging auxiliary device according to claim 1, characterized in that: The shielding member is slidable relative to the fixed plate in a first direction, and the first area is exposed during the sliding process of the shielding member relative to the fixed plate.

3. The emission imaging auxiliary device according to claim 2, characterized in that: The fixing plate body is provided with slide grooves on two opposite sides in the second direction. The slide grooves extend along the first direction and the shielding member slides in the slide grooves. The second direction and the first direction meet a perpendicular condition.

4. The emission imaging auxiliary device according to claim 3, characterized in that: The fixing plate body forms limiting end surfaces at opposite ends of the sliding groove, and the shielding member is limited by the limiting end surfaces abutting against the second portion.

5. The emission imaging auxiliary device according to claim 1, characterized in that: The first portion is semi-cylindrical.

6. The emission imaging auxiliary device according to claim 5, characterized in that: An end of the first portion close to the first region has a first inclined surface, and the first inclined surface is inclined from the inside to the outside in a direction away from the first region.

7. The emission imaging auxiliary device according to claim 5, characterized in that: The outer diameter of the first part is between 56 mm and 60 mm; and / or The inner diameter of the first part is between 36 mm and 40 mm; and / or The length of the first portion is between 50 mm and 70 mm.

8. The emission imaging auxiliary device according to claim 1, characterized in that: The second part is a trapezoidal semi-cylinder and has a mounting cavity formed on a side facing the fixed plate body, and a partial structure of the fixed plate body is located in the mounting cavity.

9. The emission imaging auxiliary device according to claim 8, characterized in that: One end of the second portion close to the first region has a second inclined surface, and the second inclined surface is inclined along a direction away from the first region toward a direction away from the first portion.

10. The emission imaging auxiliary device according to claim 8, characterized in that: The outer diameter of the second part is between 69 mm and 73 mm; and / or The inner diameter of the second part is between 49 mm and 53 mm; and / or The length of the second portion is between 50 mm and 60 mm.

11. The emission imaging auxiliary device according to claim 1, characterized in that: The first area is provided with a head limiting member.

12. The emission imaging auxiliary device according to claim 1, characterized in that: The shielding member is made of lead material, or the shielding member is made of tungsten material.

13. A transmission imaging system, characterized in that: The device comprises an equipment body and a radiation imaging auxiliary device as claimed in any one of claims 1 to 12, wherein the radiation imaging auxiliary device is mounted on the body.

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