A thermoluminescence measuring device

Abstract

The present disclosure claims protection for a thermoluminescence measurement device, comprising a positioning frame including a positioning body, a clamping body, a connecting rod, a fixing frame, and a sliding post. The positioning body is used to position the frame; the clamping body is used to clamp the positioning frame to a thermoluminescence phantom; the positioning body is connected to the clamping body; the clamping body is connected to the connecting rod; the connecting rod is connected to the fixing frame, the fixing frame is connected to the sliding post, and the sliding post is connected to the positioning body. This thermoluminescence measurement device can accurately position the frame and the phantom, facilitating measurement of radioactive stents.

Description

Technical Field

[0001] The present disclosure belongs to the field of radiotherapy medical devices, and particularly relates to a thermoluminescence measurement device. Background Art

[0002] The use of radioactive sources in medicine dates back over 100 years and has played a crucial role in humanity's fight against malignant tumors. Currently, radioactive isotopes such as iodine-131 are most widely used in tumor radiotherapy.

[0003] The most fundamental requirement for radiotherapy is accurate dose delivery. The accuracy of brachytherapy doses depends on accurate measurement of the radiation source. Quality control of radiotherapy also requires measurements of radioactivity, dose rate, and spatial dose distribution. Summary of the Invention

[0004] The present disclosure provides a thermoluminescence measurement device, including a supporting thermoluminescence phantom and a positioning frame, wherein the positioning frame is used to support the thermoluminescence phantom and position the bracket carrying radioactive material relative to the thermoluminescence phantom, and is characterized in that: the positioning frame includes a positioning body, a clamping body, a connecting rod, a fixing frame and a sliding column; the positioning body is used to position the bracket carrying radioactive material; the clamping body is used to clamp the positioning frame and the thermoluminescence phantom; the positioning body is connected to the clamping body; the clamping body is connected to the connecting rod; the connecting rod is connected to the fixing frame, the fixing frame is connected to the sliding column, and the sliding column is connected to the positioning body.

[0005] Optionally, the clamping body includes a protrusion, a vertical rod, and a swing rod; the phantom includes a recess provided on the side wall; wherein the protrusion cooperates with the recess on the side wall of the phantom to enable the clamping body to tighten the phantom; the swing rod swings along the axis pin connecting the clamping body and the positioning body, so that the protrusion is inserted into or removed from the recess on the side wall of the phantom.

[0006] Optionally, the positioning body includes a supporting part, an adjusting part, and a transverse connecting rod; the supporting part is used to support the bracket with radioactive material; the adjusting part is used to adjust the axial position of the bracket with radioactive material relative to the body model; the transverse connecting rod is used to support the bottom end of the body model, one end of the adjusting part is connected to the supporting part, and the other end of the adjusting part is connected to the transverse connecting rod.

[0007] Optionally, one end of the connecting rod is connected to the swing rod via a pin; the other end of the connecting rod is connected to the fixed frame via a pin, and the fixed frame is capable of moving along the sliding column. When the fixed frame moves downward, one end of the fixed frame drives the connecting rod to move, which drives the swing rod to swing. When the swing rod swings, the protrusion is driven out of the recess in the side wall of the phantom. When the fixed frame moves upward, one end of the fixed frame drives the connecting rod to move, which drives the swing rod to swing. When the swing rod swings, the protrusion is driven to insert into the recess in the side wall of the phantom, thereby positioning the positioning frame relative to the phantom. Optionally, the measuring device also includes a spring and a positioning ball, which are used to position the fixed frame and the connecting rod.

[0008] Optionally, the axle pin connecting the fixing frame and the connecting rod further includes a groove that cooperates with a positioning ball.

[0009] Optionally, a groove is provided on the connecting rod to assemble the spring and the positioning ball.

[0010] Optionally, the phantom includes a first sub-phantom and a second sub-phantom, the first sub-phantom is arranged outside the second sub-phantom; one end of the first sub-phantom has a recessed portion, and one end of the second sub-phantom has a protrusion, the protrusion matches the recessed portion.

[0011] Optionally, the first sub-phantom and the second sub-phantom each include a plurality of holes with different radial depths, and thermoluminescent elements are disposed in the holes.

[0012] Optionally, the first sub-mold has a bearing surface, the second sub-mold has a pressure surface, the pressure surface has ribs or grooves, and the bearing surface is provided with grooves or ribs adapted to the pressure surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 An embodiment of the thermoluminescence measurement device disclosed herein

[0014] Figure 2 An embodiment of the thermoluminescent phantom positioning frame disclosed in the present invention

[0015] Figure 3 One embodiment of the phantom disclosed herein

[0016] Figure 4 The present disclosure Figure 3 Enlarged view of the middle phantom embodiment

[0017] Figure 5 The present disclosure Figure 3 Separation state diagram of the middle phantom embodiment

[0018] Figure 6 The present disclosure Figure 5 Enlarged view of the middle phantom

[0019] Figure 7 The present disclosure Figure 1 The connection structure between the fixing frame 3027 and the connecting rod 3026 in the thermoluminescence measuring device DETAILED DESCRIPTION

[0020] A well-type ionization chamber is a device that uses the principle of thermoluminescence to measure nuclear radiation. Thermoluminescent elements are solids with a crystalline structure that often contain various lattice defects (such as missing atoms or ions or the addition of certain foreign impurities). These defects attract oppositely charged particles, forming "traps." When exposed to radiation, electrons and positive ions generated in the solid are captured by the traps. During testing, the solid is heated, and the released electrons and positive ions recombine with oppositely charged particles elsewhere in the solid, emitting light. This emitted light passes through and is directed to a photomultiplier tube, generating a photocurrent. This current is then amplified by a DC amplifier and recorded by a recorder. By measuring the magnitude of this current, the amount of radiation received by the thermoluminescent element can be determined.

[0021] A stent containing radioactive material and a phantom simulating human tissue are placed in a well-type ionization chamber, and a thermoluminescent element is placed in the phantom. The thermoluminescent element records the radiation of the radioactive material. By analyzing the amount of radiation received by the thermoluminescent element, the amount of radiation received by the phantom by the stent containing radioactive material can be calculated.

[0022] By placing thermoluminescent elements at different locations within the phantom, the different amounts of radiation received at different locations within the phantom can be calculated.

[0023] To obtain the circumferential radiation parameters of a radioactive stent, the phantom is typically longer than the stent itself. To more accurately locate the stent and phantom relative to each other, a specific positioning frame is designed based on the phantom and stent dimensions to position the stent in the center of the phantom.

[0024] As attached Figure 1 As shown, a radioactivity measurement device 300 includes a phantom 301, a bracket 303, and a positioning frame 302. The positioning frame is used to support the thermoluminescent phantom and position the bracket relative to the thermoluminescent phantom. Optionally, the bracket's axial mid-positioning plane and the phantom's axial mid-positioning plane are identical, that is, both are plane M. This relative positioning allows calculation of the relative position of the hole in the phantom 301 where the thermoluminescent element is placed and the bracket, thereby facilitating calculation of the bracket's radiation distribution.

[0025] As attached Figure 1 and 2 The positioning frame 302 includes positioning bodies 3023, 2024, 3025; clamping bodies 3031, 3032, 3033; a connecting rod 3026; a fixing frame 3027 and a sliding column 3028; and also includes shaft pins 401, 402, 403;

[0026] The positioning body includes a support portion 3025, an adjustment portion 3024, and a transverse connecting rod 3023. The support portion 3025 supports the bracket; the adjustment portion 3024 adjusts the axial position of the bracket 303 relative to the phantom 301; and the transverse connecting rod 3023 supports the bottom end of the phantom. One end of the adjustment portion is connected to the support portion, and the other end is connected to the transverse connecting rod.

[0027] The clamping body includes a protrusion 3031, a vertical rod 3032, and a swing rod 3033. The protrusion 3031 cooperates with the recess in the side wall of the phantom to enable the clamping body to tighten the phantom. The swing rod 3033 can swing along the axis pin 401 connecting the clamping body and the positioning body, thereby allowing the protrusion 3031 to enter or exit the recess in the side wall of the phantom.

[0028] One end of the connecting rod 3026 is connected to the swinging rod 3033 via a pin 402; the other end of the connecting rod 3026 is connected to the fixed frame 3027 via a pin 403. The fixed frame 3027 is movable along the sliding post 3028. When the fixed frame 3027 moves downward, one end of the fixed frame 3027 drives the connecting rod 3026 to move, which in turn drives the swinging rod 3033 to swing. As the swinging rod 3033 swings, the protrusion 3031 is disengaged from the recess in the side wall of the phantom. When the fixed frame 3027 moves upward, one end of the fixed frame 3027 drives the connecting rod 3026 to move, which in turn drives the swinging rod 3033 to swing. As the swinging rod 3033 swings, the protrusion 3031 is inserted into the recess in the side wall of the phantom, thereby positioning the positioning frame relative to the phantom.

[0029] Stents carrying radioactive materials have varying diameters, requiring phantoms with different inner diameters. This necessitates multiple sets of phantoms. The present invention utilizes a modular design that allows for stents of varying diameters to be combined with a single phantom, reducing the number of phantoms required.

[0030] like Figure 3 and 4 As shown, the phantom 100 includes several holes of different depths, each containing thermoluminescent elements. The thermoluminescent elements in the holes of different depths record the amount of radiation emitted by the stent at the corresponding location on the phantom. The phantom 100 can include two sub-phantoms, with the outer diameter of the first sub-phantom equal to the inner diameter of the second sub-phantom. The inner diameter of the first sub-phantom can accommodate a stent that fits its inner diameter; the inner diameter of the second sub-phantom can accommodate a stent that fits its inner diameter. The inner diameter of the first sub-phantom can be different to accommodate stents of different diameters. The hole in the first sub-phantom can be at a distance S1 from its inner diameter; the hole in the second sub-phantom can be at a distance S2 from the inner diameter of the first sub-phantom. Obviously, distance S2, i.e., the distance between the hole in the second sub-phantom and the surface of the stent being measured, includes the thickness of the first sub-phantom.

[0031] Optionally, the phantom 100 includes a sub-phantom 101 and a sub-phantom 102 (e.g., Figure 5 and 6 The inner diameter of the sub-phantom 101 is D200, and the inner diameter of the sub-phantom 102 is D201. Figure 5 The figure shows the state of the sub-phantom 101 being removed from the sub-phantom 102. The inner diameter D200 of the sub-phantom 101 can be varied to accommodate different stent diameters. When the sub-phantom 101 is removed from the sub-phantom 102, a stent with a diameter of D201 can also be measured.

[0032] Sub-mold 102 has a bearing surface 2022, and sub-mold 101 has a pressure surface 2021. The pressure surface 2021, i.e., a protrusion at the end of sub-mold 101, is supported by a recessed portion, i.e., the bearing surface 2022. The combination of the protrusion and recessed portion allows for precise positioning of sub-molds 101 and 102. Furthermore, the pressure surface may have ribs or grooves, and the bearing surface may have grooves or ribs that match those on the pressure surface. Furthermore, other sub-molds may be provided, either externally or internally mounted on sub-mold 102 or internally.

[0033] Attachment Figure 1 The phantom 300 in the figure can also be attached Figure 3-6 The phantom 100 in.

[0034] As attached Figure 7 The accompanying drawings illustrate the connection structure between the fixing bracket 3027 and the connecting rod 3026. The connection structure includes a pin 403, a spring 407, and a positioning ball 406. The pin 403 has a groove that mates with the positioning ball 406. The connecting rod 3026 also has a groove for accommodating the spring 407 and positioning ball 406. The connecting rod 3026 also includes an end 405 having a through hole for the pin 403 to pass through. When the fixing bracket 3027 is moved to a set position, the positioning ball 406 is positioned in the groove on the pin 403, preventing the fixing bracket 3027 and the connecting rod 3026 from moving relative to each other.

[0035] The positioning frame disclosed herein has a simple structure and is easy to use. By providing adjustable sections of varying lengths, the frame can be easily positioned within the phantom for different stent lengths and phantoms, ensuring accurate measurements. Furthermore, the positioning frame can be secured or released from the phantom simply by moving it up and down, making it easy to use. One end of the positioning frame's sliding post 3028 also facilitates positioning within the ionization chamber.

[0036] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A thermoluminescence measurement device, comprising a supporting thermoluminescence phantom and a positioning frame, The positioning frame is used to support the thermoluminescent phantom and position the bracket with radioactive material relative to the thermoluminescent phantom, and is characterized by: The positioning frame includes a positioning body, a clamping body, a connecting rod, a fixing frame and a sliding column; The positioning body is used to position the bracket with radioactive material; the clamping body is used to clamp the positioning bracket and the thermoluminescent phantom; The positioning body is connected to the clamping body; the clamping body is connected to the connecting rod; the connecting rod is connected to the fixing frame, the fixing frame is connected to the sliding column, and the sliding column is connected to the positioning body; The clamping body includes a protrusion, a vertical rod, and a swing rod; the phantom includes a recess provided on a side wall; The protrusion cooperates with the recess in the side wall of the phantom to enable the clamping body to tighten the phantom; the swing rod swings along the axis pin connecting the clamping body and the positioning body, thereby allowing the protrusion to be inserted into or removed from the recess in the side wall of the phantom; The positioning body includes a supporting portion, an adjusting portion, and a transverse connecting rod; the supporting portion is used to support the bracket with radioactive material; The adjusting portion is used to adjust the axial position of the bracket with radioactive material relative to the phantom; the transverse connecting rod is used to support the bottom end of the phantom, one end of the adjusting portion is connected to the supporting portion, and the other end of the adjusting portion is connected to the transverse connecting rod.

2. The thermoluminescence measurement device according to claim 1, wherein one end of the connecting rod is connected to the swinging rod via a pivot pin; the other end of the connecting rod is connected to the fixed frame via a pivot pin, and the fixed frame is movable along the sliding post. When the fixed frame moves downward, one end of the fixed frame drives the connecting rod to move, which drives the swinging rod to swing. When the swinging rod swings, the protrusion is driven out of the recess in the side wall of the phantom. When the fixed frame moves upward, one end of the fixed frame drives the connecting rod to move, which drives the swinging rod to swing. When the swinging rod swings, the protrusion is driven to insert into the recess in the side wall of the phantom, thereby positioning the positioning frame relative to the phantom. 3 . The thermoluminescence measuring device according to claim 2 , further comprising a spring and a positioning ball, wherein the spring and the positioning ball are used to position the fixing frame and the connecting rod. 4 . The thermoluminescence measuring device according to claim 3 , wherein the axle pin connecting the fixing frame and the connecting rod further comprises a groove for cooperating with a positioning ball. 5 . The thermoluminescence measuring device according to claim 4 , wherein the connecting rod is provided with a groove for assembling the spring and the positioning ball.

6. The thermoluminescence measurement device according to claim 1, characterized in that: The phantom includes a first sub-phantom and a second sub-phantom, wherein the first sub-phantom is arranged outside the second sub-phantom; One end of the first sub-phantom has a recessed portion, and one end of the second sub-phantom has a protruding portion, wherein the protruding portion matches the recessed portion.

7. The thermoluminescence measurement device according to claim 6, characterized in that: The first sub-phantom and the second sub-phantom both include a plurality of holes with different radial depths, and thermoluminescent elements are arranged in the holes.

8. The thermoluminescence measurement device according to claim 1 is characterized in that: The first sub-body mold has a bearing surface, and the second sub-body mold has a pressure surface. The pressure surface is provided with protruding ribs or grooves, and the bearing surface is provided with grooves or protruding ribs adapted to the pressure surface.

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