A multi-ring collimator imaging structure and imaging device for a full-ring SPECT

Abstract

A multi-ring collimator imaging structure and imaging device for a full-ring SPECT. The multi-ring collimator imaging structure has needle outer holes provided on the surface of the outer ring of the pinhole; needle inner holes provided on the surface of the inner ring of the pinhole; and a ray penetration opening provided on the surface of the fully shielded intermediate ring. The outer ring of the pinhole is relatively movably mounted outside the ring of the fully shielded intermediate ring, so that when the outer ring of the pinhole passes through the ray penetration opening, the needle outer holes pass through and align with the ray penetration opening. The inner ring of the pinhole is relatively movably mounted inside the ring of the fully shielded intermediate ring, so that when the inner ring of the pinhole passes through the ray penetration opening, the needle inner holes pass through and align with the ray penetration opening. For the multi-ring collimator imaging device, the outer ring of the pinhole, the fully shielded intermediate ring and the inner ring of the pinhole form an imaging unit. This solution realizes the functions of not needing to replace the collimator, shielding redundant rays and only retaining the rays emitted by the organ to be examined, and automatically and highly accurately adapting the pinhole to the detected organ, thereby greatly improving the examination efficiency, shortening the examination time, improving the imaging quality and the precise positioning of the organ to be examined.

Description

Technical Field

[0001] The present invention relates to the technical field of collimators, and particularly to a multi-ring collimator imaging structure and an imaging device for a full-ring SPECT. Background Art

[0002] The collimator probes of existing SPECTs are mostly dual-probe collimators with two arms extending out. The inspection function of the collimator is single. For different organ inspections, it is necessary to manually or automatically replace the corresponding collimator. In addition, the dual-probes cannot fully cover the main organs of the body. During the inspection process, for different organ inspections, it is necessary to specifically adjust parameters such as the probe angle and position. Therefore, the existing SPECT has the disadvantages of long time consumption and low inspection efficiency when performing multi-organ and whole-body inspections.

[0003] At the same time, the dual-probes of existing SPECTs cannot fully cover the human body in a full circle, resulting in relatively blurred imaging quality. Moreover, the dual-probes themselves are relatively heavy. At the same time, to achieve the adjustment of angle and position parameters, the existing SPECT installs the dual-probes in a cantilever manner, resulting in poor patient inspection experience and even potential safety risks.

[0004] For the above reasons, the motion mechanism of the existing SPECT equipment is relatively complex, prone to failures, and the subsequent maintenance in hospitals is relatively cumbersome, with high costs remaining high. Summary of the Invention

[0005] The purpose of the present invention is to propose a multi-ring collimator imaging structure for a full-ring SPECT, which realizes the linkage between the outer needle holes, the inner needle holes, and the ray penetration ports through the cooperation of the pinhole inner ring on the inner side of the fully shielded middle ring and the pinhole outer ring on the outer side.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A multi-ring collimator imaging structure for a full-ring SPECT, comprising: a pinhole outer ring, a fully shielded middle ring, and a pinhole inner ring;

[0008] The surface of the pinhole outer ring is provided with outer needle holes; the surface of the pinhole inner ring is provided with inner needle holes; the surface of the fully shielded middle ring is provided with ray penetration ports;

[0009] The pinhole outer ring is relatively movably installed outside the ring of the fully shielded middle ring, so that when the pinhole outer ring passes through the ray penetration port, the outer needle holes pass through and align with the ray penetration port;

[0010] The pinhole inner ring is relatively movably installed inside the ring of the fully shielded middle ring, so that when the pinhole inner ring passes through the ray penetration port, the inner needle holes pass through and align with the ray penetration port.

[0011] Preferably, the area outside the needle outer hole forms an outer shielding area, so that when the pinhole outer ring passes through the radiation penetration port, the needle outer hole and the outer shielding area pass through and align with the radiation penetration port respectively;

[0012] The area outside the needle inner hole forms an inner shielding area, so that when the inner ring of the needle hole passes through the radiation penetration port, the needle inner hole and the inner shielding area pass through and align with the radiation penetration port respectively.

[0013] Preferably, the needle outer holes and / or the needle inner holes are respectively provided with a plurality of rows, and shielding gaps are formed between the rows; the shielding gaps pass through and are aligned with the ray penetration opening.

[0014] Preferably, at least one of the pinhole outer ring, the fully shielded middle ring and the pinhole inner ring comprises: an imaging sub-plate;

[0015] A plurality of imaging sub-plates are sequentially connected to form a ring structure.

[0016] Preferably, the imaging sub-plates of the pinhole outer ring, the fully shielded middle ring and the pinhole inner ring are parallel to each other.

[0017] Preferably, it further comprises: a moving component;

[0018] The movable components are installed inside and outside the fully shielded intermediate ring, and the pinhole outer ring is connected to the movable component outside the ring and is relatively movably installed outside the fully shielded intermediate ring through the movable component, so that when the pinhole outer ring passes through the radiation penetration port, the pinhole outer hole passes through and is aligned with the radiation penetration port;

[0019] The pinhole inner ring is connected to the movable assembly inside the ring, and can be relatively movably installed in the ring of the fully shielded intermediate ring through the movable assembly, so that when the pinhole inner ring passes through the radiation penetration port, the needle inner hole passes through and aligns with the radiation penetration port.

[0020] Preferably, the moving assembly comprises: a moving outer rail and a moving slider;

[0021] One of the movable outer track and the movable slider is installed inside and / or outside the fully shielded intermediate ring; the other is fixed inside the pinhole outer ring and / or outside the pinhole inner ring; the movable slider is movably installed on the movable outer track, so that the pinhole outer ring and / or the pinhole inner ring can be relatively movably installed on the fully shielded intermediate ring.

[0022] Preferably, the movable outer rail and / or the movable slider are installed at the intersection between the imaging sub-plates.

[0023] A multi-ring collimator imaging device for a full-ring SPECT, comprising the multi-ring collimator imaging structure as described above;

[0024] The pinhole outer ring, the fully shielded middle ring, and the pinhole inner ring form an imaging unit; the fully shielded middle rings of multiple said imaging units are connected in sequence and communicate with each other.

[0025] Preferably, two adjacent said imaging units are connected at an angle between their fully shielded middle rings.

[0026] Advantages of the present invention:

[0027] In this multi-ring collimator imaging structure, the pinhole outer ring and the pinhole inner ring are respectively arranged at the outer and inner rings of the fully shielded middle ring. The pinhole outside the pinhole outer ring penetrates through the ray penetration port to the pinhole inside the pinhole inner ring, realizing the functions of not needing to replace the collimator, shielding redundant rays and only retaining the rays emitted by the organ to be examined, and the pinhole automatically and highly accurately adapting to the detected organ. Thus, the examination efficiency is greatly improved, the examination time is shortened, the imaging quality and the accurate positioning of the organ to be examined are improved. At the same time, the movement and control of the whole system are simplified, the equipment failure during later use is reduced, and the hospital maintenance is reduced. Description of the drawings

[0028] Figure 1 is a schematic structural diagram of the multi-ring collimator imaging structure;

[0029] Figure 2 is a schematic structural diagram of the multi-ring collimator imaging structure;

[0030] Figure 3 is a schematic structural diagram of the multi-ring collimator imaging structure;

[0031] Figure 4 is a schematic structural diagram of the multi-ring collimator imaging device;

[0032] Figure 5 is a schematic structural diagram when the pinhole outer ring is in a full-pass state and the pinhole inner ring is in a semi-pass state;

[0033] Figure 6 is a schematic structural diagram when the pinhole outer ring is in a semi-pass state;

[0034] Figure 7 is a schematic structural diagram when the pinhole outer ring is in a shielded state;

[0035] Figure 8 is a schematic structural diagram when the pinhole inner ring is in a shielded state;

[0036] Figure 9 is a schematic structural diagram of the imaging sub-board of the pinhole outer ring or the pinhole inner ring.

[0037] Wherein:

[0038] Pinhole outer ring 1, fully shielded middle ring 2, pinhole inner ring 3, moving component 4; imaging sub-board 5; imaging unit 001; shielding gap 6;

[0039] Outer pinhole 11; ray penetration opening 21; inner pinhole 31; moving outer track 41, moving slider 42. Specific embodiments

[0040] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings through specific embodiments.

[0041] A multi-ring collimator imaging structure for a full-ring SPECT, comprising: a pinhole outer ring 1, a fully shielded middle ring 2 and a pinhole inner ring 3;

[0042] The surface of the pinhole outer ring 1 is provided with an outer pinhole 11; the surface of the pinhole inner ring 3 is provided with an inner pinhole 31; the surface of the fully shielded middle ring 2 is provided with a ray penetration opening 21;

[0043] The pinhole outer ring 1 is movably mounted outside the fully shielded middle ring 2, so that when the pinhole outer ring 1 passes through the ray penetration opening 21, the outer pinhole 11 passes through and aligns with the ray penetration opening 21;

[0044] The pinhole inner ring 3 is movably mounted inside the fully shielded middle ring 2, so that when the pinhole inner ring 3 passes through the ray penetration opening 21, the inner pinhole 31 passes through and aligns with the ray penetration opening 21.

[0045] In this multi-ring collimator imaging structure, by respectively arranging the pinhole outer ring 1 and the pinhole inner ring 3 at the outer and inner rings of the fully shielded middle ring 2, and passing the outer pinhole 11 of the pinhole outer ring 1 through the ray penetration opening 21 to penetrate to the inner pinhole 31 of the pinhole inner ring 3, the functions of not needing to replace the collimator, shielding redundant rays and only retaining the rays emitted by the organ to be examined and the automatic high-precision adaptation of the pinhole to the detection organ are realized, thereby greatly improving the inspection efficiency, shortening the inspection time, improving the imaging quality and the accurate positioning of the organ to be examined. At the same time, the movement and control of the whole set of systems are simplified, the equipment failure during later use is reduced, and the hospital maintenance is reduced.

[0046] Specifically, the pinhole outer ring 1 is movably connected to the outside of the fully shielded middle ring 2, so that the pinhole outer ring 1 is movably mounted outside the fully shielded middle ring 2; the pinhole inner ring 3 is movably connected to the inside of the fully shielded middle ring 2, so that the pinhole inner ring 3 is movably mounted inside the fully shielded middle ring 2;

[0047] The examiner is located inside the pinhole inner ring 3; since the surface of the fully shielded middle ring 2 is provided with a ray penetration opening 21, as Figures 5-7, when the outer pinhole ring 1 and the inner pinhole ring 3 move, the outer pinholes 11 of the outer pinhole ring 1 will be aligned with the ray penetration opening 21, and the inner pinholes 31 of the inner pinhole ring 3 will be aligned with the ray penetration opening 21; when the outer pinholes 11, the ray penetration opening 21, and the inner pinholes 31 are aligned in sequence, the ray can pass through the outer pinholes 11, the ray penetration opening 21, and the inner pinholes 31 and enter the organ to be detected by the examiner, and the rest are shielded, achieving minimizing the interference of ineffective rays to the greatest extent, greatly improving the imaging quality and clarity. At the same time, since the outer pinhole ring 1, the fully shielded intermediate ring 2, and the inner pinhole ring 3 are annular, it realizes 360° full-week coverage of the main organs of the human body, greatly improving the inspection efficiency and shortening the inspection time of the patient.

[0048] Preferably, an outer shielding area 71 is formed in the area outside the outer pinholes 11, so that when the outer pinhole ring 1 passes through the ray penetration opening 21, the outer pinholes 11 and the outer shielding area 71 respectively pass through and are aligned with the ray penetration opening 21;

[0049] An inner shielding area 72 is formed in the area outside the inner pinholes 31, so that when the inner pinhole ring 3 passes through the ray penetration opening 21, the inner pinholes 31 and the inner shielding area 72 respectively pass through and are aligned with the ray penetration opening 21.

[0050] In this multi-ring collimator imaging structure, the outer pinhole ring 1 and the inner pinhole ring 3 are provided with three states, namely, the full-pass state, the half-pass state, and the shielding state;

[0051] For the outer pinhole ring 1, in the full-pass state, as Figure 5 , the outer pinhole ring 1 does not pass through the ray penetration opening 21, and there is no shielding of the outer pinhole ring 1 outside the penetration opening. At this time, the ray can directly pass through the ray penetration opening 21 and enter the inside of the fully shielded intermediate ring 2; in the half-pass state, as Figure 6 , the outer pinholes 11 in the outer pinhole ring 1 pass through the ray penetration opening 21. At this time, the ray can enter the inside of the fully shielded intermediate ring through the outer pinholes 11 and the ray penetration opening 21; in the shielding state, as Figure 7 , the outer shielding area 71 (or the shielding gap 6) is located at the ray penetration opening 21, and can shield the ray to prevent the ray from entering the inside of the fully shielded intermediate ring 2.

[0052] Similarly to the outer pinhole ring 1, for the inner pinhole ring 3, in the full-pass state, the inner pinhole ring 3 does not pass through the ray penetration opening 21 of the fully shielded intermediate ring 2, and the ray can directly enter the inner pinhole ring 3 through the ray penetration opening 21; in the half-pass state, as Figure 5 , the inner pinhole ring 3 passes through the ray penetration opening 21, and the inner pinholes 31 are aligned with the ray penetration opening 21. The ray can enter the inside of the inner pinhole ring 3 through the ray penetration opening 21 and the inner pinholes 31; in the shielding state, as Figure 8, the inner pinhole ring 3 passes through the ray penetration opening 21, the inner shielding area 72 is aligned with the ray penetration opening 21, the rays are shielded by the inner shielding area 72, and the rays cannot enter the inner pinhole ring 3 through the ray penetration opening 21.

[0053] This solution can quickly and automatically adapt to the organ to be examined and achieve accurate positioning of the corresponding organ for examination through the linkage between the three states of the outer pinhole ring 1 and the inner pinhole ring 3, in cooperation with the fully shielded intermediate ring 2 located between the two. It can shield different degrees of rays for different organs, making the examination more accurate.

[0054] Preferably, a plurality of columns are respectively provided in the outer pinhole 11 and / or the inner pinhole 31, and shielding gaps 6 are formed between the columns; the shielding gaps 6 pass through and are aligned with the ray penetration opening 21.

[0055] Such as Figure 9 , the outer pinholes 11 and / or the inner pinholes 31 are arranged in columns, so shielding gaps 6 are formed between the columns; when the shielding gaps 6 are aligned with the ray penetration opening 21, the ray penetration opening 21 can be shielded; and when the outer pinholes 11 and / or the inner pinholes 31 pass through the ray penetration opening 21, since there are shielding gaps 6 or the outer shielding area 71 or the inner shielding area 72 on both sides of the outer pinholes 11 and / or the inner pinholes 31, the positions of the outer pinholes 11 and / or the inner pinholes 31 within the ray penetration opening 21 are controllable, enabling the outer pinholes 11 and / or the inner pinholes 31 to accurately reach a certain position of the ray penetration opening 21, further improving the imaging quality and the accurate positioning of the organ to be examined.

[0056] Such as Figure 9 , the shielding gap 6 is a part of the outer shielding area 71 or the inner shielding area 72. For the imaging sub - plates 5 of both the outer pinhole ring 1 and the inner pinhole ring 3, the parts outside the outer pinholes 11 and / or the inner pinholes 31 are all the outer shielding area 71 or the inner shielding area 72.

[0057] Preferably, at least one of the outer pinhole ring 1, the fully shielded intermediate ring 2, and the inner pinhole ring 3 includes: an imaging sub - plate 5;

[0058] A plurality of the imaging sub - plates 5 are connected in sequence to form an annular structure.

[0059] Such as Figure 2 , the outer pinhole ring 1, the fully shielded intermediate ring 2, and the inner pinhole ring 3 form an annular structure through the imaging sub - plates 5, which can achieve 360° full - circumference coverage of the main human organs by the detector; a fully shielded mechanism is used between the rings, and only the required rays are irradiated onto the detector through the pinholes, and the rest of the rays are fully shielded, realizing the maximum reduction of interference from ineffective rays, greatly improving the imaging quality and clarity.

[0060] Specifically, since the imaging sub-board 5 is connected into a ring structure, the imaging sub-board 5 is equivalent to a polygonal structure, and it can have more outer needle holes 11 or inner needle holes 31 arranged thereon, making the detection target more accurate and the arrangement more uniform.

[0061] A plurality of the imaging sub-boards 5 are connected in sequence to form a closed ring structure, and the shape of the ring structure is polygonal. The imaging sub-board 5 can form an unclosed ring structure or a closed ring structure. The shape of the ring structure is polygonal and in the shape of a cylinder, such as a triangle, a quadrilateral, a pentagon, etc. As shown in the figure, the ring structure is a nonagon; the polygon can be a conventional regular structure or an irregular structure, such as a regular nonagon or an irregular nonagon.

[0062] Preferably, the imaging sub-boards 5 of the outer needle hole ring 1, the fully shielded middle ring 2, and the inner needle hole ring 3 are parallel to each other.

[0063] When the outer needle hole ring 1, the fully shielded middle ring 2, and the inner needle hole ring 3 are arranged in parallel, under the driving action of the moving component 4, the three can move in parallel, ensuring that the outer needle holes 11, the ray penetration openings 21, and the inner needle holes 31 can be aligned in sequence to improve the accuracy of light transmission and shielding. At the same time, due to the parallel arrangement of the three, the moving component 4 is arranged between the three, which can separate the three and form a gap therebetween to prevent wear between the outer needle hole ring 1, the fully shielded middle ring 2, and the inner needle hole ring 3, improving safety.

[0064] Preferably, it further includes: a moving component 4;

[0065] The moving component 4 is installed inside and outside the fully shielded middle ring 2. The outer needle hole ring 1 is connected to the moving component 4 outside the ring and is relatively movably installed outside the fully shielded middle ring 2 through the moving component 4, so that when the outer needle hole ring 1 passes through the ray penetration opening 21, the outer needle holes 11 pass through and are aligned with the ray penetration opening 21;

[0066] The inner needle hole ring 3 is connected to the moving component 4 inside the ring and is relatively movably installed inside the fully shielded middle ring 2 through the moving component 4, so that when the inner needle hole ring 3 passes through the ray penetration opening 21, the inner needle holes 31 pass through and are aligned with the ray penetration opening 21.

[0067] The moving component 4 can be replaced by a known driving structure, such as the cooperation of a wheel and a track, the cooperation of a slider and a track, a conventional cylinder drive, or the cooperation of a conventional motor and a lead screw drive, etc.; as long as it can achieve the movement between the outer needle hole ring 1, the fully shielded middle ring 2, and the inner needle hole ring 3, it should be within the scope of protection.

[0068] Preferably, the moving component 4 includes: a moving outer track 41 and a moving slider 42;

[0069] One of the movable outer track 41 and the movable slider 42 is installed inside and / or outside the fully shielded intermediate ring 2; the other is fixed inside the pinhole outer ring 1 and / or outside the pinhole inner ring 3; the movable slider 42 is movably installed on the movable outer track 41, so that the pinhole outer ring 1 and / or the pinhole inner ring 3 can be relatively movably installed on the fully shielded intermediate ring 2.

[0070] The pinhole outer ring 1, the fully shielded middle ring 2 and the pinhole inner ring 3 are moved relative to each other by moving the outer track 41 and the moving slider 42; for the pinhole outer ring 1 and the fully shielded middle ring 2, or the fully shielded middle ring 2 and the pinhole inner ring 3, the number of moving components 4 is at least 1. As shown in the figure, the number of moving components 4 is 3, which are distributed in a triangle to make the movement between the three smoother.

[0071] Preferably, the movable outer rail 41 and / or the movable slider 42 are installed at the intersection position between the imaging sub-plates 5 and the imaging sub-plates 5 .

[0072] The surface of the imaging split plate 5 is provided with an outer needle hole 11, an inner needle hole 31 or a ray penetration opening 21. In this solution, in order to prevent the movable component 4 from affecting the transmittance, the movable outer track 41 and / or the movable slider 42 are arranged between the imaging split plates 5, so that the imaging split plates 5 can form sufficient positions for setting the outer needle hole 11, the inner needle hole 31 or the ray penetration opening 21, and can realize smooth movement between the pinhole outer ring 1, the fully shielded intermediate ring 2 and the pinhole inner ring 3.

[0073] A multi-ring collimator imaging device for full-ring SPECT, comprising the multi-ring collimator imaging structure as described above;

[0074] The pinhole outer ring 1, the fully shielded middle ring 2 and the pinhole inner ring 3 form an imaging unit 001; the fully shielded middle rings 2 of multiple imaging units 001 are connected in sequence.

[0075] The number of imaging units 001 is at least 2, which further extends the length of the multi-ring collimator imaging device, ensuring that the multi-ring collimator imaging device has sufficient length to detect different positions of the human body and can fully cover the main organs of the human body, avoiding the angle and position adjustment of the probe and the collimator, simplifying the movement and control of the entire system, greatly reducing the failure rate, and facilitating the hospital's later maintenance and reducing maintenance costs. Figure 4 , the number of imaging units 001 is 2.

[0076] Preferably, the fully shielded intermediate rings 2 of two adjacent imaging units 001 are connected at different angles.

[0077] like Figure 4The two fully shielded intermediate rings 2 can preferably be coaxially arranged, and the fully shielded intermediate rings 2 can be connected at different angles; when the angles of the fully shielded intermediate rings 2 at adjacent positions are different, the imaging split plates 5 on the two fully shielded intermediate rings 2 are at different angles, and the imaging split plates 5 between the two have angle differences. Therefore, the different angles of the imaging split plates 5 can be used to make the light transmission angle more accurately targeted at different positions of the body, so that the multi-ring collimator imaging device can further irradiate from multiple angles, so as to achieve 360° full coverage of the main organs of the human body by the detector.

[0078] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A multi-ring collimator imaging device for a full-ring SPECT, characterized in that include: Multi-ring collimator imaging structure; The multi-ring collimator imaging structure comprises: a pinhole outer ring, a fully shielded middle ring and a pinhole inner ring; The surface of the pinhole outer ring is provided with a pinhole outer hole; the surface of the pinhole inner ring is provided with a pinhole inner hole; the surface of the fully shielded middle ring is provided with a radiation penetration port; The pinhole outer ring can be relatively movably mounted outside the fully shielded intermediate ring, so that when the pinhole outer ring passes through the radiation penetration port, the pinhole outer ring passes through and is aligned with the radiation penetration port; The pinhole inner ring can be relatively movably installed in the ring of the full-shielding intermediate ring, so that when the pinhole inner ring passes through the radiation penetration port, the needle inner hole passes through and is aligned with the radiation penetration port; The pinhole outer ring, the fully shielded middle ring and the pinhole inner ring form an imaging unit; the fully shielded middle rings of multiple imaging units are sequentially connected; the fully shielded middle rings of two adjacent imaging units are connected at different angles; The area outside the needle outer hole forms an outer shielding area, so that when the outer ring of the needle hole passes through the radiation penetration port, the needle outer hole and the outer shielding area pass through and align with the radiation penetration port respectively; The area outside the needle inner hole forms an inner shielding area, so that when the inner ring of the needle hole passes through the radiation penetration port, the needle inner hole and the inner shielding area pass through and align with the radiation penetration port respectively; The outer needle holes and / or the inner needle holes are respectively provided with a plurality of rows, with shielding gaps formed between the rows; the shielding gaps pass through and are aligned with the radiation penetration opening; At least one of the pinhole outer ring, the fully shielded middle ring and the pinhole inner ring comprises: an imaging sub-plate; a plurality of the imaging sub-plates are sequentially connected to form a ring structure.

2. The multi-ring collimator imaging device of a full-ring SPECT according to claim 1, wherein The imaging sub-plates of the pinhole outer ring, the fully shielded middle ring and the pinhole inner ring are parallel to each other.

3. A multi-ring collimator imaging device for a full-ring SPECT according to any one of claims 1-2, characterized in that, Also includes: Mobile components; The movable components are installed inside and outside the fully shielded intermediate ring, and the pinhole outer ring is connected to the movable component outside the ring and is relatively movably installed outside the fully shielded intermediate ring through the movable component, so that when the pinhole outer ring passes through the radiation penetration port, the pinhole outer hole passes through and is aligned with the radiation penetration port; The pinhole inner ring is connected to the movable assembly inside the ring, and can be relatively movably installed in the ring of the fully shielded intermediate ring through the movable assembly, so that when the pinhole inner ring passes through the radiation penetration port, the needle inner hole passes through and aligns with the radiation penetration port.

4. A multi-ring collimator imaging device for a full-ring SPECT according to claim 3, characterized in that, The moving assembly includes: a moving outer track and a moving slider; One of the movable outer track and the movable slider is installed inside and / or outside the fully shielded intermediate ring; the other is fixed inside the pinhole outer ring and / or outside the pinhole inner ring; the movable slider is movably installed on the movable outer track, so that the pinhole outer ring and / or the pinhole inner ring can be relatively movably installed on the fully shielded intermediate ring.

5. The multi-ring collimator imaging device of a full-ring SPECT according to claim 4, characterized in that, The movable outer rail and / or movable slider are installed at the intersection between the imaging sub-plates.

Images