Medical imaging equipment and collimation mechanism thereof

Abstract

The utility model discloses a collimation mechanism which comprises a movable supporting vehicle body and a collimator, and the collimator is fixedly connected to the top of the supporting vehicle body. The collimator is an arc-shaped structure plate body formed by splicing a plurality of collimator flat plates, the adjacent collimator flat plates are in lap joint, each collimator flat plate is at least provided with one collimator hole, the axes of the different collimator holes intersect at the center of a chord of the arc-shaped structure plate body, and the collimator is a pinhole collimator. According to the collimation mechanism, view waste is avoided, imaging efficiency is improved, different small organs can be imaged, and universality is better. The utility model further discloses medical imaging equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field, especially a kind of medical imaging equipment and its collimation mechanism. BACKGROUND

[0002] Single photon emission computed tomography equipment, namely SPECT equipment, is a kind of nuclear medicine equipment.SPECT equipment reconstructs image under the assistance of computer using gamma ray emitted by single photon radioactive nuclide injected into human body, and forms tomographic image. Among them, variable-angle double-probe SPECT equipment is the most widely used SPECT equipment, it has two probes containing multiple degrees of freedom, through the cooperation of two probes in different positions, combined with the position adjustment of patient support bed, it can realize the full-range scanning imaging of patient. Collimator is a structure installed at the front end of probe, made of high-atomic-number material, which allows specific angle incident gamma photons to pass through and absorbs gamma photons incident from other directions, so as to determine the position of the emission photon source.

[0003] In the existing double-probe SPECT equipment, the collimator is fixed to the probe, and is mostly parallel-hole collimator. Two probes form a combination of multiple probe positions through movement, and through the rotation of probe around the patient, it can perform full-range imaging of patient, and through the combination of multiple images, it realizes the tomographic imaging of whole body or local. When performing whole-body imaging, the patient can be fully covered by moving the patient on the patient support bed in the height direction, and the width direction is covered by increasing the field of view of probe, so the field of view of double-probe SPECT equipment is generally a large-area rectangular field of view. This double-probe SPECT equipment, when imaging small organs such as heart, thyroid and brain, a large part of the above-mentioned rectangular field of view will not play a role, resulting in waste of field of view. In order to detect small organs, a SPECT equipment specially used for different small organs needs to be purchased, which has high cost. SUMMARY

[0004] Therefore, the utility model provides a collimation mechanism, avoids the waste of field of view, improves the imaging efficiency, can image different small organs, and has better versatility.

[0005] The utility model also provides a medical imaging equipment.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A collimation mechanism, comprising:

[0008] A movable support vehicle body;

[0009] A collimator is fixedly connected to the top of the support vehicle body;

[0010] The collimator is an arc-shaped structure plate body spliced by a plurality of collimator panels, adjacent collimator panels are overlapped, at least one collimator hole is arranged on each collimator panel, and the axes of different collimator holes intersect at the center of a chord of the arc-shaped structure plate body.

[0011] Optionally, the support vehicle body comprises an arc-shaped support and an arc-shaped shielding plate, the collimator is mounted on the arc-shaped support, and the arc-shaped shielding plate is mounted on the side of the arc-shaped support away from the collimator.

[0012] Optionally, the support vehicle body comprises a main frame and casters connected to the bottom of the main frame, the arc-shaped support and the arc-shaped shielding plate are arranged on the top of the main frame, a first positioning column is arranged on one side of the bottom of the main frame, a second positioning column is arranged on the other side of the bottom of the main frame, the first positioning column and the second positioning column are connected with a limiting mechanism, and the limiting mechanism is used for positioning the support vehicle body.

[0013] Optionally, the limiting mechanism comprises a reference part and a locking part, one of the first positioning column and the second positioning column is connected with the reference part, and the other is connected with the locking part.

[0014] The first positioning column and the second positioning column are arranged on opposite sides of the support vehicle body.

[0015] Optionally, the locking part comprises a first base and a first top plate connected, the first base is provided with a first U-shaped groove for sliding connection of the first positioning column, and a side wall of the first U-shaped groove is slidingly provided with an elastic blocking rod for limiting the first positioning column.

[0016] The first base is rotationally provided with a first lever and a second lever, the first lever is used for pushing the elastic blocking rod away from the first U-shaped groove, and the second lever is used for limiting the elastic blocking rod to be away from the first U-shaped groove.

[0017] Optionally, the reference part comprises a second base and a second top plate connected, and the second base is provided with a second U-shaped groove for sliding connection of the second positioning column.

[0018] The first positioning column is in a first direction along the sliding direction of the first U-shaped groove, the second positioning column is in a second direction along the sliding direction of the second U-shaped groove, and the first direction and the second direction are arranged perpendicularly.

[0019] Optionally, the arc-shaped bracket includes an arc-shaped main board, an arc-shaped mounting groove, and an arc-shaped connecting ring platform. The arc-shaped mounting groove is located on the side of the arc-shaped main board away from the collimator, and the arc-shaped connecting ring platform is located on the side of the arc-shaped main board close to the collimator. The arc-shaped mounting groove is used to install the arc-shaped shielding plate, and the arc-shaped connecting ring platform is used to install the collimator.

[0020] The inner side of the arc-shaped bracket contacts the collimator. The inner side of the arc-shaped bracket is composed of multiple supporting planes spliced ​​together, and the supporting planes are correspondingly arranged with the collimator plate.

[0021] As can be seen from the above technical solution, the collimation mechanism provided by this utility model has an arc-shaped collimator composed of multiple collimator plates spliced ​​together to form an arc-shaped structure plate. Compared to a collimator with an integral structure, the collimator plates spliced ​​together to form the collimator are planar plates, which are easier to process, have lower manufacturing costs, and save costs. The collimator is a pinhole collimator, with multiple small-hole imaging collimator holes, which allows for the acquisition of more images at once, i.e., multiple images are formed simultaneously within the field of view. Since the angles of the collimator holes on the collimator plate are different, the images of small organs formed through each collimator hole are also different, which is equivalent to acquiring images from multiple different angles. Therefore, it is not necessary to acquire images from multiple angles by rotating the probe, saving acquisition time. The collimation mechanism of this utility model avoids wasted field of view, improves imaging efficiency, can image different small organs, and has better versatility.

[0022] This utility model also provides a medical imaging device, including a first probe, a second probe, a collimation mechanism, and an examination bed. The collimation mechanism is the collimation mechanism described above. The collimation mechanism is movable below the first probe and the second probe. The examination bed is movable below the collimator of the collimation mechanism. The first probe and the second probe are arranged around the collimator. A shielding box is provided on the end face of the first probe and the second probe near the collimator. The shielding box is arranged around the probe to block gamma rays from non-collection areas from entering the acquisition range of the probe.

[0023] Optionally, the shielding box includes a shielding frame, one end of which is connected to the probe, and the other end is disposed near the collimator. The end of the shielding frame near the collimator is conformally disposed to the outer surface of the collimator, and the gap between the shielding frame and the collimator is smaller than the width of the arc-shaped shielding plate on the collimation mechanism.

[0024] The shielding box also includes a support frame, which is connected to the probe.

[0025] Optionally, the shielding frame is a shell structure with a flared opening. The large end of the shielding frame is connected to the support frame, and the small end is located near the collimator. The port of the shielding frame near the collimator is an arc-shaped opening corresponding to the curvature of the collimator.

[0026] The shielding frame is made of lead or tungsten.

[0027] The medical imaging device provided by this utility model includes the collimation mechanism described above, and therefore has the advantages of the collimation mechanism described above, which will not be repeated here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the assembly structure of the collimation mechanism provided in this embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the disassembled structure of the collimation mechanism provided in this embodiment of the utility model;

[0031] Figure 3 A schematic diagram showing an angle of the axis of different collimator holes on the collimation mechanism provided in this embodiment of the utility model;

[0032] Figure 4 A structural schematic diagram showing another angle of the axis of different collimator holes on the collimation mechanism provided in an embodiment of this utility model;

[0033] Figure 5 A schematic diagram of the collimator at one angle provided in an embodiment of this utility model;

[0034] Figure 6 A schematic diagram of the collimator from another angle provided in an embodiment of this utility model;

[0035] Figure 7 for Figure 6 A partially enlarged structural diagram of part A in the diagram;

[0036] Figure 8 An exploded view of the collimation mechanism provided in this embodiment of the utility model;

[0037] Figure 9 A schematic diagram of the locking part provided in an embodiment of this utility model;

[0038] Figure 10 A schematic diagram of the connection structure of the various components installed on the first base provided in this embodiment of the utility model;

[0039] Figure 11 A schematic diagram of the initial state of the locking part provided in an embodiment of this utility model;

[0040] Figure 12 A schematic diagram of the structure of the first base provided in an embodiment of this utility model;

[0041] Figure 13 A schematic diagram of the second position state of the locking part provided in an embodiment of this utility model;

[0042] Figure 14 A schematic diagram of the third position state of the locking part provided in an embodiment of this utility model;

[0043] Figure 15 A structural schematic diagram of the fourth position state of the locking part provided in an embodiment of this utility model;

[0044] Figure 16 A schematic diagram of the structure of the reference part provided in an embodiment of this utility model;

[0045] Figure 17 A schematic diagram of the structure of the second base provided in an embodiment of this utility model;

[0046] Figure 18 A schematic diagram of the structure of the arc-shaped bracket at one angle provided in an embodiment of this utility model;

[0047] Figure 19 This is a structural schematic diagram of the arc-shaped bracket provided in an embodiment of the present invention from another angle;

[0048] Figure 20 A schematic diagram of the structure of a medical imaging device provided in an embodiment of this utility model from one angle;

[0049] Figure 21 This is a schematic diagram of the medical imaging device provided in another embodiment of the present invention.

[0050] Figure 22 A schematic diagram of the structure of the image acquisition area of ​​the probe of the medical imaging device provided in this embodiment of the utility model is a spherical region;

[0051] Figure 23 A schematic diagram of the structure of the shielding frame provided in an embodiment of this utility model;

[0052] Figure 24 A schematic diagram of the support frame provided in an embodiment of this utility model;

[0053] Figure 25 A schematic diagram showing the relative positions of the shielding box and the collimation mechanism provided in an embodiment of this utility model;

[0054] Figure 26 A schematic diagram of the structure of the image acquired by the collimator hole in the field of view of the first probe provided in this embodiment of the utility model;

[0055] Figure 27 A schematic diagram of the structure of the medical imaging device provided in this embodiment of the present invention, showing the first and second probes moving to the second acquisition position.

[0056] in:

[0057] 01. Collimation mechanism; 02. Examination bed; 03. Shielding box; 031. Shielding frame; 032. Support frame; 04. First probe; 05. Second probe; 06. Image.

[0058] 1. Support the vehicle body,

[0059] 101. First positioning post; 102. Second positioning post; 103. First connecting arm; 104. Second connecting arm; 105. Main frame; 106. Arc-shaped shielding plate; 107. Arc-shaped bracket; 1071. Arc-shaped main plate; 1072. Arc-shaped connecting ring platform; 1073. Arc-shaped mounting groove; 108. Casters.

[0060] 2. Collimator

[0061] 201. Collimator hole; 202. Collimator plate; 2021. First lap joint; 2022. Second lap joint.

[0062] 3. Locking part,

[0063] 301. First base; 3011. First U-shaped groove; 3012. First mounting through hole; 3013. Limiting post; 3014. Sliding cavity; 3015. Second side hole; 3016. First side hole; 302. First top plate; 303. Second lever; 304. First lever; 305. Third spring; 306. Elastic blocking rod; 3061. Rod head; 3062. Rod body; 3063. Blocking block; 307. First limiting block; 308. First spring; 309. Second limiting block; 310. Second spring.

[0064] 4. Reference section,

[0065] 401, Second base; 4011, Second U-shaped groove; 4012, Second mounting through hole; 402, Second top plate. Detailed Implementation

[0066] This utility model discloses a collimation mechanism that avoids wasted field of view, improves imaging efficiency, can image different small organs, and has better versatility.

[0067] This utility model also discloses a medical imaging device.

[0068] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0069] Reference Figures 1 to 19 The collimation mechanism 01 of this utility model includes a supporting vehicle body 1 and a collimator 2. The supporting vehicle body 1 is movable, and the collimator 2 is fixedly connected to the top of the supporting vehicle body 1. The collimator 2 is an arc-shaped structural plate formed by splicing multiple collimator plates 202. Adjacent collimator plates 202 overlap, and each collimator plate 202 is provided with at least one collimator hole 201. The axes of different collimator holes 201 intersect at the center of the chord of the arc-shaped structural plate, such as... Figure 3 and Figure 4 As shown, the collimator 2 is a pinhole collimator, meaning that each collimator hole 201 can generate an image of a small organ.

[0070] Collimator 2 is positioned across both sides of the examination table. Collimator 2 is a structure installed at the front end of the SPECT probe, made of high-atomic-weight materials, commonly lead or tungsten. It allows gamma photons incident at specific angles to pass through while absorbing gamma photons incident from other directions, thus facilitating the determination of the location of the emitting radiation source. Figures 5 to 7 The collimator plate 202 has a stepped first overlapping platform 2021 on one side for overlapping, and a stepped second overlapping platform 2022 on the other side. The first overlapping platform 2021 and the second overlapping platform 2022 are configured to cooperate so that adjacent collimator plates 202 can overlap. Figure 7 As shown, a first overlapping platform 2021 of a collimator plate 202 overlaps with a second overlapping platform 2022 of an adjacent collimator plate 202.

[0071] The collimation mechanism 01 of this invention features an arc-shaped collimator 2 composed of multiple collimator plates 202 spliced ​​together to form an arc-shaped plate structure. Compared to the overall collimator 2 structure, the collimator plates 202 spliced ​​together to form the collimator 2 are planar plates, which are easier to process, have lower manufacturing costs, and save costs. The collimator 2 is a pinhole collimator, with multiple collimator holes 201 for imaging, allowing for the acquisition of more images at once, i.e., multiple images can be formed simultaneously within the field of view. Since the angles of the collimator holes 21 on the collimator plate 2 are different, the images of small organs formed through each collimator hole 201 are also different, equivalent to acquiring images from multiple different angles. Therefore, it is not necessary to acquire images from multiple angles by rotating the probe, saving acquisition time. The collimation mechanism 01 of this invention avoids wasted field of view, improves imaging efficiency, can image different small organs, and has better versatility.

[0072] Specifically, such as Figure 2 and Figure 8 As shown, the supporting vehicle body 1 includes an arc-shaped bracket 107 and an arc-shaped shielding plate 106. The arc-shaped bracket 107 and the arc-shaped shielding plate 106 have the same curvature, and the arc-shaped shielding plate 106 is located on the side of the arc-shaped bracket 107 near the inner arc-shaped surface. To facilitate the support of the collimator 2, two arc-shaped brackets 107 are provided, spaced apart, with both sides of the collimator 2 connected to the arc-shaped brackets 107. The collimator 2 is connected to the arc-shaped bracket 107 by a first connecting bolt. Since the collimator 2 is composed of multiple collimator plates 202, both ends of each collimator plate 202 are connected to the arc-shaped bracket 107 by the first connecting bolt. The arc-shaped shielding plate 106 is installed on the side of the arc-shaped bracket 107 away from the collimator 2, which facilitates blocking γ-photons from the non-collection area from entering the collimator 2 area. The arc-shaped shielding plate 106 is made of a high atomic number material, such as lead or tungsten.

[0073] In one embodiment, the collimator 2 is composed of twelve collimator plates 202 joined together, such as... Figure 5 and Figure 6 As shown, twelve collimator plates 202 are respectively mounted on the arc-shaped bracket 107, overlapping each other to form a polygon. Each collimator plate 202 has a collimator hole 201, and the number and angle of the collimator holes 201 on the twelve collimator plates 202 are different.

[0074] Furthermore, the support vehicle body 1 includes a main frame 105 and casters 108 connected to the bottom of the main frame 105. An arc-shaped bracket 107 and an arc-shaped shielding plate 106 are disposed on the top of the main frame 105. The main frame 105 is a welded metal frame. A first positioning post 101 is disposed on one side of the bottom of the main frame 105, and a second positioning post 102 is disposed on the other side. The first positioning post 101 and the second positioning post 102 are connected to a limiting mechanism, which is used to position the support vehicle body 1. To ensure the reliability of positioning, the first positioning post 101 and the second positioning post 102 are disposed on opposite sides of the support vehicle body 1. To prevent the first positioning post 101 and the second positioning post 102 from interfering with the movement of the inspection bed, the first positioning post 101 and the second positioning post 102 are disposed on the outer side of the main frame 105. The first positioning post 101 is connected to the main frame 105 via a first connecting arm 103, and the second positioning post 102 is connected to the main frame 105 via a second connecting arm 104. In one embodiment, one end of the first connecting arm 103 is welded to the first positioning post 101, and the other end is welded to the main frame 105. One end of the second connecting arm 104 is welded to the second positioning post 102, and the other end is welded to the main frame 105.

[0075] To facilitate positioning, the positioning mechanism includes a reference part 4 and a locking part 3. One of the first positioning post 101 and the second positioning post 102 is connected to the reference part 4, and the other is connected to the locking part 3.

[0076] In one specific embodiment, such as Figure 1 As shown, the second positioning post 102 is connected to the base part 4, and the first positioning post 101 is connected to the locking part 3. Specifically, the locking part 3 includes a connected first base 301 and a first top plate 302, as shown... Figures 9 to 12 As shown, the first base 301 is provided with a first U-shaped groove 3011 for sliding connection of the first positioning post 101. The first U-shaped groove 3011 is a groove structure with openings on the top and one side. The side opening of the first U-shaped groove 3011 is located on the side of the first base 301. An elastic blocking rod 306 for limiting the movement of the first positioning post 101 is slidably provided on the side wall of the first U-shaped groove 3011. In order to prevent the first top plate 302 from affecting the sliding of the first positioning post 101 in the first U-shaped groove 3011, the first top plate 302 is provided with a corresponding opening at the position corresponding to the first U-shaped groove 3011.

[0077] The elastic blocking rod 306 includes a rod head 3061, a rod body 3062, and a blocking block 3063 connected together. The dimensions of the rod head 3061 and the blocking block 3063 are larger than the dimensions of the rod body 3062. The rod body 3062 passes through the through hole of the first limiting block 307, which is fixedly installed on the first base 301. A first spring 308 is sleeved on the rod body 3062. One end of the first spring 308 is limited by the first limiting block 307, and the other end is limited by the blocking block 3063. To facilitate the first positioning post 101 entering the first U-shaped groove 3011 and pushing the blocking block 3063 to move the elastic blocking rod 306, the end face of the blocking block 3063 near the first U-shaped groove 3011 is an inclined surface, with the inclined surface having a side opening facing the first U-shaped groove 3011. To limit the sliding of the blocking block 3063, two second limiting blocks 309 are installed on the first base 301. The two second limiting blocks 309 are respectively located on both sides of the blocking block 3063, thereby limiting the sliding of the blocking block 3063 and preventing the elastic blocking rod 306 from deviating and getting stuck during the sliding process. The first base 301 is provided with a sliding cavity 3014 for the sliding of the blocking block 3063, and the two second limiting blocks 309 are respectively located on both sides of the sliding cavity 3014.

[0078] To facilitate the movement and locking of the elastic blocking rod 306, a first lever 304 and a second lever 303 are rotatably mounted on the first base 301. The first lever 304 moves the elastic blocking rod 306 away from the first U-shaped groove 3011, and the second lever 303 limits the elastic blocking rod 306, causing it to leave the first U-shaped groove 3011. The first lever 304 is rotatably mounted on the first base 301 via a first rotating shaft, and the second lever 303 is rotatably mounted on the first base 301 via a second rotating shaft. To facilitate installation of the first base 301, a first mounting through hole 3012 is provided on the first base 301, and the first base 301 is positioned by expansion bolts connected within the first mounting through hole 3012. To improve installation reliability, two first mounting through holes 3012 are provided.

[0079] like Figure 11As shown, in the initial state, the actuating end of the first lever 304 corresponds to the end face of the lever head 3061 near the lever body 3062, and the driving end of the first lever 304 extends through the first side hole 3016 on the first base 301 and is disposed outside the first base 301. A second spring 310 is disposed near the actuating end of the first lever 304. In the initial state, the second spring 310 is in its original, non-extended state. One end of the second spring 310 is connected to the first lever 304, and the other end is connected to the first base 301. The connection between the second spring 310 and the first lever 304 is located on the side of the first rotating shaft near the actuating end. The actuating end of the second lever 303 contacts the side wall of the lever head 3061, and the driving end of the second lever 303 extends through the second side hole 3015 on the first base 301 and is disposed outside the first base 301. A third spring 305 is provided on the second lever 303. One end of the third spring 305 is connected to the second lever 303, and the other end is connected to the first base 301. The connection position between the third spring 305 and the second lever 303 is located on the side of the second rotating shaft near the driving end of the second lever 303. In the initial state, the third spring 305 is in its original, non-extended state.

[0080] When the first positioning pin 101 is pushed into the first U-shaped groove 3011, the blocking block 3063 retracts, and the locking part 3 reaches the second position state, such as... Figure 13 As shown, the first positioning post 101 is further pushed, and when the first positioning post 101 is fully inserted into the first U-shaped groove 3011, the blocking block 3063 extends under the action of the first spring 308, and the locking part 3 returns to the initial state. The first positioning post 101 is locked by the locking part 3.

[0081] When unlocking is required, the first lever 304 is moved, which moves the lever head 3061. The lever head 3061 then causes the blocking block 3063 to retract from the first U-shaped groove 3011. When the first lever 304 is moved to its limit position, the second lever 303, under the action of the third spring 305, blocks the right side of the lever head 3061. At this time, the locking part 3 reaches the third position state, such as... Figure 14 As shown, in this state, the second lever 303 is limited by the third spring 305 and the limiting post 3013. The limiting post 3013 is located on the first base 301. When the first lever 304 is released, the lever head 3061, under the action of the first spring 308, abuts against the second lever 303, and the locking part 3 reaches the fourth position state, as shown. Figure 15As shown. Without external force intervention, the blocking block 3063 will not extend, allowing the first positioning pin 101 to be removed from the locking part 3. Finally, move the second lever 303 until it disengages from the lever head 3061, then release the second lever 303. The locking part 3 returns to its initial state, and unlocking is complete. The locking part 3 has a simple structure, small size, and is more convenient to operate and more accurate in positioning. It automatically locks simply by pushing the alignment mechanism to the designated position. Unlocking is achieved by simply moving the lever.

[0082] The reference part 4 includes a second base 401 and a second top plate 402 connected by a second connecting bolt, for reference. Figure 16 and Figure 17 The second base 401 is provided with a second U-shaped groove 4011 for sliding connection of the second positioning post 102. The second top plate 402 has corresponding openings at positions corresponding to the second U-shaped groove 4011. To facilitate installation of the second base 401, a second mounting through hole 4012 is provided on the second base 401, and the second base 401 is positioned by expansion bolts connected within the second mounting through hole 4012. To improve installation reliability, two second mounting through holes 4012 are provided. Specifically, the sliding direction of the first positioning post 101 along the first U-shaped groove 3011 is the first direction, and the sliding direction of the second positioning post 102 along the second U-shaped groove 4011 is the second direction. The first direction and the second direction are perpendicular.

[0083] In one embodiment, the arc-shaped bracket 107 includes an arc-shaped main board 1071. The arc-shaped main board 1071 has an arc-shaped mounting groove 1073 for mounting an arc-shaped shielding plate 106. The arc-shaped mounting groove 1073 is located on the side of the arc-shaped main board 1071 away from the collimator 2. An arc-shaped connecting ring platform 1072 is provided on the side of the arc-shaped main board 1071 closest to the collimator 2, such as... Figure 8 , Figure 18 and Figure 19 As shown, the arc-shaped connecting ring platform 1072 is used to install the collimator 2. The end of the arc-shaped bracket 107 is connected to the main frame 105 by a third connecting bolt. When the collimator 2 is installed with the arc-shaped bracket 107, the inner surface of the arc-shaped bracket 107 contacts the collimator 2. The inner surface of the arc-shaped bracket 107 is an arc-shaped surface composed of multiple supporting planes, which are correspondingly arranged with the collimator plate 202. The arc-shaped connecting ring platform 1072 is provided with multiple connecting through holes, and the collimator plate 202 is connected to the arc-shaped connecting ring platform 1072 by a fourth connecting bolt connected in the connecting through holes.

[0084] This utility model also provides a medical imaging device, such as Figure 20 and Figure 21As shown, the device includes a first probe 04, a second probe 05, a collimation mechanism 01, and an examination bed 02. The collimation mechanism 01 is the collimation mechanism described above. The collimation mechanism 01 can be moved below the first probe 04 and the second probe 05. The examination bed 02 can move the patient below the collimator 2 of the collimation mechanism 01. The first probe 04 and the second probe 05 are arranged around the collimator 2. A shielding box 03 is provided on the end face of the first probe 04 and the second probe 05 near the collimator 2. The end of the shielding box 03 near the probe is arranged around the field of view of the probe. The shielding box 03 is used to block gamma rays from non-collection areas from entering the acquisition range of the probe. Each of the first probe 04 and the second probe 05 is connected to a shielding box 03, as shown below. Figure 22 As shown.

[0085] Among them, the shielding box 03 includes a shielding frame 031, such as Figure 23 As shown, one end of the shielding frame 031 is connected to the probe, and the other end is positioned near the collimator 2. To reduce the amount of gamma rays from non-collection areas entering the probe's collection range, the end of the shielding frame 031 near the collimator 2 is conformally shaped to the outer surface of the collimator 2, and the gap between the shielding frame 031 and the collimator 2 is smaller than the width of the arc-shaped shielding plate 106 on the collimation mechanism 01. The arc-shaped shielding plate 106, the collimator 2, and the shielding frame 031 cooperate to form a complete shielding layer. In another embodiment, the shielding box 03 further includes a support frame 032, through which the shielding frame 031 is connected to the probe. The support frame 032 is provided with a structure for connecting the probe and the shielding frame 031, such as... Figure 24 As shown, the structure of this connection can be a through-hole, with the connection achieved through a connector, such as a bolt, inserted into the through-hole. When the shielding frame 031 is made of lead, a support frame 032 is required because lead is relatively soft. When the shielding frame 031 is made of tungsten, the support frame 032 is not required because tungsten is hard and has better mechanical properties than lead. The shielding frame 031 can also be made of other metals with high atomic numbers; this is not limited here.

[0086] In one embodiment, the shielding box 03 includes a shielding frame 031 and a support frame 032. The shielding frame 031 is a flared shell structure. The larger end of the shielding frame 031 is connected to the support frame 032, and the smaller end is located near the collimator 2. The port of the shielding frame 031 near the collimator 2 is an arc-shaped opening corresponding to the curvature of the collimator 2. When the collimator 2 is an arched surface spliced ​​from multiple planes, for ease of processing, the port of the shielding frame 031 near the collimator 2 is still set as an arc-shaped surface. This arc-shaped surface can be set to conform to the surface of the collimator 2, such as... Figure 25 As shown.

[0087] The collimation mechanism of the medical imaging device of this utility model uses a pinhole collimator 2. The principle of the pinhole collimator is similar to pinhole imaging, where each collimator hole 201 can form an image. All collimator holes 201 are aligned with the same image acquisition area B, such as... Figure 22 As shown, since collimator 2 is a pinhole collimator, each pinhole can form an image. The dashed line in the figure represents the path of gamma rays passing through collimator hole 201 during pinhole imaging. In this embodiment, the image acquisition area B is a spherical region that can cover small human organs commonly detected by SPECT equipment, such as the heart, thyroid gland, and brain.

[0088] In one embodiment, such as Figure 26 As shown, the field of view of the first probe 04 can accommodate the images formed by ten collimator holes 201, that is, ten images 06 can be acquired at once. Adjusting the direction and position of the collimator holes 201 can also achieve the acquisition of more images 06 at once. Since the angles of the collimator holes 201 on the collimator 2 are different, the images of small organs formed through each collimator hole 201 are also different, which is equivalent to acquiring images from multiple different angles. Therefore, unlike traditional SPECT equipment, it is not necessary to rotate the probe to acquire images from multiple angles.

[0089] In use of the medical imaging device of this utility model, firstly, the shielding box 03 is installed on the first probe 04 and the second probe 05. Then, the collimation mechanism 01 is pushed across the examination bed 02 to the locking part 3 and the reference part 4, and the locking part 3 and the reference part 4 are used to position and lock the collimation mechanism 01. Afterwards, the first probe 04 and the second probe 05 are brought close to the collimation mechanism 01, so that the arc end face of the shielding box 03 is close to the collimator 2. Preferably, the distance between the arc end face of the shielding box 03 and the collimator 2 is within 10mm. The patient lies on the examination bed 02, and the examination bed 02 moves the patient to a suitable position. The first probe 04 and the second probe 05 begin to acquire images. One acquisition, such as... Figure 20 As shown, the first probe 04 and the second probe 05 can acquire a total of twenty images from different angles, which is sufficient for 3D reconstruction of small organs from an algorithmic perspective. In the above acquisition, approximately one-third of the collimator aperture 201 remains unused. If needed, the first probe 04 and the second probe 05 only need to be rotated once and moved to the second acquisition position, as shown... Figure 27 As shown, image acquisition can be achieved for all collimator holes 201. After acquisition is complete, the examination bed 02 returns to its initial position, and the patient leaves the examination bed 02. Simultaneously, the first probe 04 and the second probe 05 move a certain distance away from the collimation mechanism 01. The locking part 3 is unlocked, and the collimation mechanism 01 is pushed away from the SPECT device, thus ending the entire process.

[0090] This invention relates to a medical imaging device. The shielding box 03, the arc-shaped shielding plate 106, and the collimator 2 work together to achieve omnidirectional interference shielding, preventing gamma rays from affecting the imaging process outside the target organ and resulting in better imaging quality. The two probes can simultaneously acquire images of multiple small organs, offering higher acquisition efficiency compared to traditional SPECT or cardiac-specific SPECT. Furthermore, since image reconstruction can be completed using only 2 / 3 of the images acquired by the collimators 2, the remaining 1 / 3 can be used for other purposes, such as further image acquisition to provide richer data for organ image reconstruction, or fabricated into other types of collimators to achieve the integration of other functions.

[0091] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this solution.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0093] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A collimation mechanism, characterized in that, include: Movable support vehicle body; The collimator is fixedly connected to the top of the supporting vehicle body; The collimator is an arc-shaped structure plate made up of multiple collimator plates. Adjacent collimator plates overlap, and each collimator plate has at least one collimator hole. The axes of different collimator holes intersect at the center of the chord of the arc-shaped structure plate. The collimator is a pinhole collimator.

2. The collimation mechanism according to claim 1, characterized in that, The supporting vehicle body includes an arc-shaped bracket and an arc-shaped shielding plate. The collimator is mounted on the arc-shaped bracket, and the arc-shaped shielding plate is mounted on the side of the arc-shaped bracket away from the collimator.

3. The collimation mechanism according to claim 2, characterized in that, The supporting vehicle body includes a main frame and casters connected to the bottom of the main frame. The arc-shaped bracket and arc-shaped shielding plate are disposed on the top of the main frame. A first positioning post is disposed on one side of the bottom of the main frame, and a second positioning post is disposed on the other side. The first positioning post and the second positioning post are connected to a limiting mechanism, which is used to position the supporting vehicle body.

4. The collimation mechanism according to claim 3, characterized in that, The limiting mechanism includes a reference part and a locking part, wherein one of the first positioning post and the second positioning post is connected to the reference part, and the other is connected to the locking part; The first positioning post and the second positioning post are located on opposite sides of the supporting vehicle body.

5. The collimation mechanism according to claim 4, characterized in that, The locking part includes a first base and a first top plate connected together. The first base is provided with a first U-shaped groove for sliding connection of the first positioning post. The side wall of the first U-shaped groove is slidably provided with an elastic blocking rod for limiting the first positioning post. The first base is rotatably provided with a first lever and a second lever. The first lever is used to move the elastic blocking rod away from the first U-shaped groove, and the second lever is used to limit the elastic blocking rod so that the elastic blocking rod leaves the first U-shaped groove.

6. The collimation mechanism according to claim 5, characterized in that, The reference part includes a second base and a second top plate connected together, and the second base is provided with a second U-shaped groove for sliding connection of the second positioning column; The sliding direction of the first positioning post along the first U-shaped groove is the first direction, and the sliding direction of the second positioning post along the second U-shaped groove is the second direction. The first direction and the second direction are set perpendicular to each other.

7. The collimation mechanism according to claim 2, characterized in that, The arc-shaped bracket includes an arc-shaped main board, an arc-shaped mounting groove, and an arc-shaped connecting ring platform. The arc-shaped mounting groove is located on the side of the arc-shaped main board away from the collimator, and the arc-shaped connecting ring platform is located on the side of the arc-shaped main board close to the collimator. The arc-shaped mounting groove is used to install the arc-shaped shielding plate, and the arc-shaped connecting ring platform is used to install the collimator. The inner side of the arc-shaped bracket contacts the collimator. The inner side of the arc-shaped bracket is composed of multiple supporting planes spliced ​​together, and the supporting planes are correspondingly arranged with the collimator plate.

8. A medical imaging device, comprising a first probe, a second probe, a collimation mechanism, and an examination table, characterized in that, The collimation mechanism is the collimation mechanism according to any one of claims 1-7. The collimation mechanism can be moved below the first probe and the second probe. The examination bed can be moved below the collimator of the collimation mechanism. The first probe and the second probe are arranged around the collimator. A shielding box is provided on the end face of the first probe and the second probe near the collimator. The shielding box is arranged around the probe to block gamma rays from non-collection areas from entering the collection range of the probe.

9. The medical imaging device according to claim 8, characterized in that, The shielding box includes a shielding frame, one end of which is connected to the probe, and the other end is located near the collimator. The end of the shielding frame near the collimator is conformally arranged to the outer surface of the collimator. The gap between the shielding frame and the collimator is smaller than the width of the arc-shaped shielding plate on the collimation mechanism. The shielding box also includes a support frame, which is connected to the probe.

10. The medical imaging device according to claim 9, characterized in that, The shielding frame is a horn-shaped shell structure. The large end of the shielding frame is connected to the support frame, and the small end is located near the collimator. The port of the shielding frame near the collimator is an arc-shaped opening corresponding to the curvature of the collimator. The shielding frame is made of lead or tungsten.

Images