Medical scanning system and water mold tool for SPECT correction thereof

Abstract

The utility model relates to a medical scanning system and a water mold tool for SPECT correction of the medical scanning system. Comprising a water mold, a skeleton and a radioactive source. The framework comprises a plurality of supporting pieces, the supporting pieces are connected with one another and define a polyhedral geometric structure with a containing cavity, and the water mold is arranged in the containing cavity; the radioactive source comprises a long line source, a point source and a short line source, one of the long line source, the point source and the short line source is selected to be arranged on the framework, and the long line source is longer than the short line source; wherein the support piece comprises a first support piece, the length of the first support piece is adjustable, a fixed point is formed at the joint of any two connected support pieces, and one of the long line source, the point source and the short line source is selectively fixed on the first support piece or the fixed point. According to the water mold tool, uniformity calibration of the probe or the collimator, registration correction of the SPECT equipment and the CT equipment and posture and sensitivity correction of the probe can be achieved at the same time, time and labor are saved during calibration, and radiation damage to operators can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical instruments, in particular to a medical scanning system and a water phantom for SPECT correction thereof. BACKGROUND

[0002] SPECT is a mature imaging technology in the field of nuclear medicine today, and is widely used in clinical detection. For a SPECT / CT system, in order to ensure the imaging quality, quality control and correction need to be performed regularly. The items of quality control and correction include: uniformity correction of a probe or a collimator, registration of a SPECT device and a CT device, geometric correction of a probe, sensitivity correction of a probe, etc.

[0003] In the related art, different water phantoms are needed for different calibration items, and different water phantoms need to be made for different calibration items during calibration, which not only consumes time and effort, but also causes certain radiation damage to the operator. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a medical scanning system and a water phantom for SPECT correction thereof in view of the problem that different water phantoms need to be made for different calibration items.

[0005] A water phantom for SPECT correction, the water phantom for SPECT correction comprises:

[0006] a water phantom body;

[0007] a framework, the framework comprises a plurality of support pieces, the plurality of support pieces are connected to each other and surround a multi-faceted geometric structure with a containing cavity, the water phantom body is arranged in the containing cavity, the support pieces comprise a first support piece, a length of the first support piece is adjustable, a connection between any two connected support pieces forms a fixed point, and

[0008] a radioactive source, comprising a long linear source, a point source and a short linear source, the long linear source, the point source and the short linear source are fixed on the first support piece or the fixed point alternatively.

[0009] In one of the embodiments, the framework is a quadrangular prism structure.

[0010] In one of the embodiments, the first support piece comprises a support section and a telescopic section arranged at two ends of the support section along the length direction respectively, the support section is a tubular structure, an outer diameter of the telescopic section is smaller than an inner diameter of the support section, the telescopic section is in sliding connection with the support section, and the telescopic section has a retracted state of being retracted into the tubular structure and an elongated state of being extended out of the tubular structure.

[0011] In one of the embodiments, the first support comprises a support segment and folding segments respectively arranged at two ends of the support segment, and the folding segments have an elongated state parallel to the support segment and a folding state at an angle to the support segment when the folding segments are rotated.

[0012] In one of the embodiments, the first support is a hollow tube structure, and the long linear source is arranged in the first support.

[0013] In one of the embodiments, the radioactive source comprises at least three short linear sources not in the same plane, and the at least three short linear sources are sequentially connected end to end; and the vertex of the quadrangular prism structure is a fixed point, and the connecting points of the adjacent two short linear sources are fixed on the vertex.

[0014] In one of the embodiments, the SPECT correction water phantom comprises a support, and the point source is fixed on the fixed point by the support.

[0015] In one of the embodiments, the quadrangular prism structure has a first surface, and the two diagonal lines of the first surface are respectively provided with the support, and the intersection of the two supports forms a fixed point, and the point source is arranged on the fixed point at the intersection.

[0016] In one of the embodiments, the skeleton has a rotation axis configured to rotate the probe therearound, and the skeleton has a plane intersecting the rotation axis.

[0017] The radioactive source comprises at least three point sources, and the at least three point sources are located at different fixed points on the plane.

[0018] A medical scanning system, comprising:

[0019] a bed body;

[0020] a scanning gantry, wherein a scanning cavity is formed in the scanning gantry, and the scanning gantry is provided with probes at two opposite positions along the scanning cavity in the radial direction; and

[0021] a SPECT correction water phantom, wherein the water phantom is at least partially arranged on the bed body, and the first support is exposed to the bed body, the long linear source extends in the radial direction of the scanning cavity and is fixed on the first support, and the bed body is used to drive the water phantom to reciprocate in the scanning cavity in the axial direction of the scanning cavity.

[0022] The medical scanning system and the water phantom for SPECT correction can realize the uniformity calibration of the probe or the collimator by adjusting the length of the first support to make the length of the first support greater than or equal to the length of the probe, fixing the long line source on the first support, placing the water phantom on the bed body, and moving the bed body reciprocally along the direction perpendicular to the length of the probe when the probe or the collimator is calibrated. When the registration correction of the SPECT device and the CT device is realized, three short line sources are arranged to be not coplanar, one end point of each short line source is connected with one fixed point, and the other end point of the short line source is connected with another fixed point. The water phantom provided with the short line sources is placed in the scanning field of view of the SPECT device and the scanning field of view of the CT device, and then the water phantom is scanned by the SPECT device and the CT device respectively to realize the registration of the SPECT device and the CT device. When the posture or the sensitivity of the probe is corrected, the point source is fixed on the fixed point. The water phantom can realize the uniformity calibration of the probe or the collimator, the registration correction of the SPECT device and the CT device, and the posture and sensitivity correction of the probe, and the number of the water phantom is reduced, the time and labor are saved, and the radiation damage to the operator is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic view of the water phantom in an embodiment.

[0024] Figure 2 FIG. 2 is a top view of the water phantom arranged on the bed body in an embodiment.

[0025] Figure 3 FIG. 3 is a side view of the water phantom arranged on the bed body in an embodiment.

[0026] Figure 4 FIG. 4 is a structural schematic view of the short line source arranged on the water phantom in an embodiment.

[0027] Figure 5 FIG. 5 is a structural schematic view of the point line source arranged on the water phantom in an embodiment.

[0028] Figure 6 FIG. 6 is a structural schematic view of the point line source arranged on the water phantom in another embodiment.

[0029] FIG. 1 is a structural schematic view of the water phantom in an embodiment.

[0030] 210, long linear source; 220, short linear source; 230, point source; 231, holder;

[0031] 300, bed body; 310, probe. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and that the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0038] Referring to Figures 1-6 An embodiment of the present application provides a SPECT correction water phantom, which comprises a water phantom body, a framework 100 and a radioactive source. The framework 100 comprises a plurality of support members 110, which are connected to each other and surround a multi-faceted geometric structure having a receiving cavity, and the water phantom is arranged in the receiving cavity; the radioactive source comprises a long linear source 210, a point source 230 and a short linear source 220, which are alternatively arranged on the framework 100, and the length of the long linear source 210 is greater than that of the short linear source 220; wherein the support member 110 comprises a first support member 120, the length of the first support member 120 is adjustable, and the connection between any two connected support members 110 forms a fixed point 140, and the long linear source 210, the point source 230 and the short linear source 220 are alternatively fixed on the first support member 120 or the fixed point 140.

[0039] It should be noted that the framework 100 is used to support the water phantom, and the long linear source 210, the short linear source 220 or the point source 230 can be arranged on the framework 100, the long linear source 210 and the short linear source 220 are flexible radioactive sources, and the support member 110 is a hard rod, a hard tube or a hard plate.

[0040] In one embodiment, the first support member 120 is used to fix the long linear source 210; any two fixed points 140 are used to fix a short linear source 220, and each fixed point 140 is used to fix a point source 230.

[0041] When the probe 310 or the collimator uniformity calibration is performed, the long linear source 210, the short linear source 220 and the point source 230 are arranged on the framework 100, and the long linear source 210, the short linear source 220 and the point source 230 are arranged on the framework 100.Figure 2 and Figure 3 The length of the first support 120 is adjusted so that the length of the first support 120 is greater than or equal to the length of the probe 310, and the long linear source 210 is fixed on the first support 120, then the water phantom is placed on the bed 300, and the first support 120 is located outside the bed 300, and the bed 300 is reciprocated along the direction perpendicular to the length of the probe 310, so that the uniformity calibration of the probe 310 or the collimator can be realized. When the registration correction of the SPECT device and the CT device is performed, three non-coplanar short linear sources 220 are arranged, and one end point of each short linear source 220 is connected with one fixed point 140, and the other end point of the short linear source 220 is connected with another fixed point 140. The water phantom provided with the short linear source 220 is placed in the scanning field of view of the SPECT device and the scanning field of view of the CT device at the same time, and then the water phantom is scanned by the SPECT device and the CT device respectively, so that the registration of the SPECT device and the CT device is realized. When the posture or sensitivity correction of the probe is realized, the point source 230 is fixed on the fixed point 140.

[0042] That is, the water phantom of the present application can simultaneously realize the uniformity calibration of the probe 310 or the collimator, the registration correction of the SPECT device and the CT device, and the posture and sensitivity correction of the probe, reduce the number of water phantoms, save time and labor when performing various calibrations, and can reduce the radiation damage to the operator.

[0043] In another embodiment, the length of the first support 120 can also be adjusted to fix the short linear source 220, or the point source 230 can be arranged at any position of the first support 120; or the two fixed points 140 are used to fix one long linear source 210.

[0044] In some embodiments, the skeleton 100 is a quadrangular prism structure.

[0045] In the present embodiment, the skeleton 100 is a quadrangular prism structure, which can be a cuboid structure or a cube structure. Twelve edges of the quadrangular prism are used as the supports 110, i.e., twelve supports 110 are used to enclose the quadrangular prism skeleton 100 structure.

[0046] The first support 120 is any one of the twelve edges, and the length of the first support 120 is adjustable. When the uniformity calibration of the probe 310 or the collimator is performed, the first support 120 can be lengthened so that the length of the first support 120 is greater than or equal to the length of the probe 310, so as to fix the long linear source 210 by the first support 120. In this way, the volume of the water phantom can be reduced, the occupied space of the water phantom can be reduced, and the miniaturization design of the entire medical scanning system is facilitated.

[0047] Combining Figure 4 In the registration correction of the SPECT device and the CT device, three non-coplanar short line sources 220 are arranged, the quadrangular prism has eight vertices 141, and two ends of each short line source 220 are fixed through one vertex 141 respectively, so as to fix at least three non-coplanar short line sources 220 on the water mold tool, and facilitate the registration correction of the SPECT device and the CT device.

[0048] In some embodiments, the at least three non-coplanar short line sources 220 are connected end to end, so that the short line sources 220 can be fixed by using the least vertices 141, and the fixing mode is simple. For example, the number of short line sources 220 is three, the three short line sources 220 are connected end to end in sequence to form four end points, and in actual use, the four end points are fixed on the corresponding four vertices 141 respectively, so that the three short line sources 220 can be fixed, and the fixing mode is simple.

[0049] The quadrangular prism includes a bottom surface, a top surface, and four side surfaces, the bottom surface and the top surface are arranged at two sides opposite to the side surface positions respectively, the first short line source 220 is arranged on the bottom surface, the second short line source 220 is arranged on the top surface, and the third short line source 220 is arranged on the side surface. Specifically, the first short line source 220 is arranged on one of the diagonal lines of the bottom surface, the second short line source 220 is arranged on one of the diagonal lines of the top surface, and the third short line source 220 is arranged on one of the diagonal lines of the side surface, and the three short line sources 220 are connected in sequence. Of course, the three short line sources 220 can also be connected on other vertices 141, as long as the three short line sources 220 are non-coplanar.

[0050] In some other embodiments, the three short line sources 220 are not connected with each other, for example, the first short line source 220 is arranged on one side of the bottom surface, the second short line source 220 is arranged on one side of the top surface, and the third short line source 220 is arranged on one side of the side surface.

[0051] In other embodiments, the first short line source 220 and the second short line source 220 can be connected with each other, the first short line source 220 and the second short line source 220 are arranged on two adjacent surfaces of the quadrangular prism respectively, the third short line source 220 is not connected with the second short line source 220, and the second short line source 220 is arranged on other surfaces of the quadrangular prism.

[0052] Combining Figure 1 In some embodiments, the first support 120 includes a support section 121 and a telescopic section 122 arranged at two ends of the support section 121 along the length direction respectively, the support section 121 is a tubular structure, the outer diameter of the telescopic section 122 is smaller than the inner diameter of the support section 121, and the telescopic section 122 is in sliding connection with the support section 121, so that the telescopic section 122 has a retracted state of being retracted into the tubular structure and an elongated state of being extended out of the tubular structure.

[0053] In the embodiment, the support section 121 is a hollow tube structure, and two ends of the support section 121 are welded, bonded or connected by an angular fixing member to other support members 110 to form the framework 100. The outer diameter of the telescopic section 122 is smaller than the inner diameter of the support section 121, and the telescopic section 122 can slide relative to the support section 121 to realize telescopic extension and contraction. When the probe 310 or the collimator uniformity is calibrated, the two telescopic sections 122 are respectively pulled out of the support section 121 to make the telescopic sections 122 in the extended state, and then one end of the long line source 210 is connected to the first telescopic section 122 and the other end of the long line source 210 is connected to the second telescopic section 122, so that the long line source 210 is fixed. When the probe 310 or the collimator uniformity is not calibrated, the two telescopic sections 122 are respectively retracted into the support section 121 to make the telescopic sections 122 in the retracted state, so as to reduce the volume of the water phantom tooling.

[0054] Specifically, the telescopic section 122 is also a hollow tube structure, and the telescopic section 122 includes a first telescopic section and a second telescopic section, and the first telescopic section and the second telescopic section are respectively located at two ends of the support section 121. The long line source 210 is sequentially arranged in the first telescopic section, the support section 121 and the second telescopic section.

[0055] In some other embodiments, the first support member 120 includes the support section 121 and the folding sections 123 rotatably arranged at two ends of the support section 121. When the folding sections 123 are rotated, the folding sections 123 have the extended state parallel to the support section 121 and the folded state arranged at an angle to the support section 121.

[0056] In the embodiment, the two ends of the support section 121 are respectively rotationally connected with the folding sections 123. When the probe 310 or the collimator uniformity is calibrated, the two folding sections 123 are respectively in the elongated state parallel to the support section 121, i.e. the two folding sections 123 are respectively located on the extension line of the support section 121, one end of the long linear source 210 is connected with the first folding section 123, and the other end of the long linear source 210 is connected with the second folding section 123, so that the fixation of the long linear source 210 is realized. When the probe 310 or the collimator uniformity is not needed to be calibrated, the folding sections 123 are rotated to make the support section 121 in the folded state at an angle, so as to reduce the volume of the water phantom tool. Specifically, when the folding sections 123 are in the folded state, the two folding sections 123 are respectively at 90 degrees with the support section 121, so that the two folding sections 123 can be closely arranged on the framework 100. Further, the magnetic attraction member can be arranged on the framework 100, so that when the folding sections 123 are in the folded state, the two folding sections 123 can be attracted on the framework 100. Of course, other detachable connection modes can also be used to make the folding sections 123 in the folded state, for example, the buckle connection.

[0057] In some embodiments, in combination with Figure 5 and Figure 6 The water phantom tool for SPECT correction includes a support 231, and the point source 230 is fixed on the fixed point 140 through the support 231.

[0058] Specifically, the support 231 includes a base and a plurality of side walls arranged on the base, and the base is connected with the fixed point 140 through clamping, bonding, welding or magnetic attraction.

[0059] In some embodiments, the quadrangular prism structure has a first face, two diagonal lines of the first face are respectively provided with the support 110, and the intersection of the two supports 110 forms a fixed point 140, and the point source 230 is arranged on the fixed point 140 at the intersection.

[0060] In the embodiment, the point source 230 is arranged on the water phantom tool for sensitivity correction of the probe 310 or correction of the posture of the probe 310.

[0061] When the posture of the probe 310 is corrected, at least three point sources 230 need to be set. When the correction is performed, the probe 310 needs to rotate around the water phantom, and the positions of the at least three point sources 230 cannot coincide when the probe 310 rotates. For example, the first face can be the top face, and the second support 130 is arranged on the diagonal line of the top face. One of the point sources 230 is arranged on the fulcrum 142 of the second support 130, and the other point sources 230 are arranged on the top points 141 of the quadrangular prism.

[0062] In order to ensure the stability of the measurement, the sensitivity of the probe 310 needs to be corrected each time the measurement is performed. When the correction is performed, the water phantom tool is placed on the probe 310, and the point sources 230 are arranged on the fulcrum 142.

[0063] In combination with Figure 6 In some embodiments, the skeleton 100 has a rotation axis 101 for rotating the probe 310 around the rotation axis 101, and the skeleton 100 has a plane intersecting the rotation axis 101. The radiation source includes at least three point sources 230 arranged at different fixed points 140 on the plane.

[0064] When the posture of the probe 310 is corrected, the probe 310 rotates around the rotation axis 101 of the water phantom, and the at least three point sources 230 are arranged at different positions on the plane intersecting the rotation axis 101, so that the positions of the at least three point sources 230 do not coincide when the probe 310 rotates around the rotation axis 101 of the water phantom.

[0065] Specifically, the plane is any diagonal face of the quadrangular prism structure, and the radiation source includes three point sources 230. One of the point sources 230 is arranged on the fulcrum 142, and the other two point sources 230 are arranged on two opposite corners of the bottom face. Each point source 230 is arranged on the corresponding fixed point 140 by the support 231. The point source 230 can be made of a syringe, a centrifuge tube, or a solid point source.

[0066] In an embodiment of the present application, a medical scanning system is also disclosed. The medical scanning system includes a bed body 300, a scanning gantry, and a water phantom tool for SPECT correction. The scanning gantry is provided with a scanning cavity, and the scanning gantry is provided with probes 310 on two opposite sides of the scanning cavity in the radial direction of the scanning cavity. The water phantom tool is at least partially arranged on the bed body 300, and a first support 120 is exposed to the bed body 300. A long linear source 210 extends in the radial direction of the scanning cavity and is fixed on the first support 120. The bed body 300 is used to drive the water phantom tool to reciprocate in the scanning cavity in the axial direction of the scanning cavity.

[0067] Specifically, in combination with Figure 2 and Figure 3When the probe 310 or the collimator uniformity calibration is performed, the probe 310 is located on the upper and lower sides of the scanning cavity, and when the water phantom workpiece is driven by the bed body 300 to reciprocate in the scanning cavity along the axial direction of the scanning cavity, the long line source 210 reciprocates between the two probes 310. The length of the long line source 210 in the radial direction of the scanning cavity is greater than the length of the probe 310 in the radial direction of the scanning cavity.

[0068] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0069] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A water model fixture for SPECT calibration, characterized in that, The SPECT calibration water model fixture includes: Water model body; A skeleton (100) comprising multiple support members (110) connected to each other to form a multifaceted geometric structure with a receiving cavity, the water model body being disposed within the receiving cavity, each support member (110) including a first support member (120) whose length is adjustable; a fixing point (140) being formed at the connection point of any two connected support members (110); and The radiation source includes a long line source (210), a point source (230), and a short line source (220), wherein one of the long line source (210), the point source (230), and the short line source (220) is fixed on the first support member (120) or the fixed point (140).

2. The SPECT calibration water model fixture according to claim 1, characterized in that, The first support member (120) includes a support section (121) and telescopic sections (122) respectively disposed at both ends of the support section (121) along the length direction. The support section (121) is a tubular structure. The outer diameter of the telescopic section (122) is smaller than the inner diameter of the support section (121). The telescopic section (122) is slidably connected to the support section (121).

3. The SPECT calibration water model fixture according to claim 1, characterized in that, The first support member (120) includes a support section (121) and folding sections (123) rotatably disposed at both ends of the support section (121). When the folding section (123) is rotated, the folding section (123) has an elongated state parallel to the support section (121) and a folded state angularly disposed to the support section (121).

4. The SPECT calibration water model fixture according to claim 1, characterized in that, The first support member (120) is a hollow tube structure, and the long wire source (210) is inserted inside the first support member (120).

5. The SPECT calibration water model fixture according to claim 1, characterized in that, The skeleton (100) is a quadrangular prism structure.

6. The SPECT calibration water model fixture according to claim 5, characterized in that, The radiation source includes at least three non-coplanar short line sources (220), and the at least three non-coplanar short line sources (220) are connected in sequence; The vertex (141) of the quadrangular prism structure is a fixed point (140), and the connection point of two adjacent short line sources (220) is fixed on the vertex (141).

7. The SPECT calibration water model fixture according to claim 5, characterized in that, The SPECT calibration water model fixture includes a bracket (231), and the point source (230) is fixed on the fixed point (140) by the bracket (231).

8. The SPECT calibration water model fixture according to claim 7, characterized in that, The quadrangular prism structure has a first face, and the support member (110) is respectively provided on the two diagonals of the first face. The intersection of the two support members (110) forms a fixed point (140), and the point source (230) is provided on the fixed point (140) at the intersection.

9. The SPECT calibration water model fixture according to claim 7, characterized in that, The frame (100) has a rotation axis (101) configured to allow the probe (310) to rotate about it, and the frame (100) has a plane intersecting the rotation axis (101); The radiation source includes at least three point sources (230), and the at least three point sources (230) are located at different fixed points (140) on the plane.

10. A medical scanning system, characterized in that, The medical scanning system includes: Bed frame (300); A scanning frame, wherein a scanning cavity is formed on the scanning frame, and probes (310) are respectively arranged on two opposite sides of the scanning cavity along the radial direction of the scanning frame; and The SPECT calibration water model fixture according to any one of claims 1-9, wherein the water model fixture is at least partially disposed on the bed (300), and the first support member (120) is exposed outside the bed (300), the long line source (210) extends radially along the scanning cavity and is fixed on the first support member (120), and the bed (300) is used to drive the water model fixture to reciprocate within the scanning cavity along the axial direction of the scanning cavity.

Images