Particle chain exposure film model device

Abstract

The utility model relates to a particle chain exposure film model device, which structurally comprises a first die body, a second die body, a particle positioning hose, a support tube and a radiation dose measurement film, the first die body and the second die body are mutually hinged, the first die body and the second die body can be folded around a hinge shaft, a plurality of first channels are arranged on the first die body, and a plurality of second channels are arranged on the second die body. A plurality of first channels are formed in the first die body, a plurality of second channels are formed in the second die body, the outer diameter of the particle positioning hose is consistent with the inner diameter of the supporting tube, the outer diameter of the supporting tube is consistent with the diameter of the first channels / second channels, and the radiation dose measuring film is placed on the involution surface of the first die body and the second die body. According to the utility model, particle chains with different lengths and different arrangements can be arranged according to needs, the particle chains are made into different shapes, different combinations of single chains or multiple chains are adopted, the distance between the particle chains and the radiation dose measurement film is controlled, and the actual radial dose distribution of the particle chains is measured. And particle chain dose distribution is verified for clinical treatment and the like.

Description

Technical Field

[0001] The utility model relates to a particle chain radioactive measurement device, in particular to a particle chain exposure film model device. Background Art

[0002] Radioactive particle implantation is an internal radiotherapy technique that implants iodine-125 particles into the tumor to kill the tumor by releasing γ rays. However, due to the special anatomical structure of the lesions in the human body cavity, it is difficult to achieve a satisfactory particle distribution by percutaneous puncture particle implantation, and the curative effect cannot be guaranteed. Inspired by the brachytherapy of lesions in the human body cavity with 192 Ir, some scholars began to try to string 125I particles into a chain-like structure and place them into the human bile duct, ureter, and esophagus for brachytherapy and achieved success. However, the radial dose distribution of the 125I particle chain has not been deeply elaborated at home and abroad. Some scholars have conducted film experiments to measure the dose field distribution of a single 125I particle and obtained that the 125I particle has a good dose field distribution. Since the particle chain is a linear source distribution of multiple particles, some scholars used a computer three-dimensional treatment planning system (3D-TPS) to calculate the surface radial dose distribution of 125I radioactive particle chains with different lengths, different distances, and different activities. After prefabricated single, double, and triple particle chains were placed into the human equivalent phantom, CT scans were performed, and the scanned images were transmitted to the treatment planning system to make a verification plan and calculate the surface radial dose distribution of the particle chain. However, the measured value is only the theoretical dose, and the actual dose cannot be determined. Moreover, most of the current studies on particle strip dosimetry define the particle strip as a linear arrangement. In actual treatment, such as the particle strip combined with a biliary stent placed in the bile duct, the particles are arranged in an arc, and some scholars have proposed the idea of setting two rows of spiral particle chains along the ureter for treatment. However, the existing technology cannot determine the dose distribution of non-linear particle chains such as arc particle chains and double-spiral particle chains. Therefore, there is an urgent need for a device that can measure the actual radial dose distribution of particle chains. Content of the Utility Model

[0003] The purpose of the utility model is to provide a particle chain exposure film model device to solve the problem that the actual radial dose distribution of particle chains cannot be measured currently.

[0004] The present utility model is implemented as follows: A particle chain exposure film model device, comprising a first mold body, a second mold body, a particle positioning hose, a support tube, and a radiation dose measurement film. The first mold body and the second mold body are hinged to each other, and the first mold body and the second mold body can be mated around the hinge axis. A plurality of first channels are provided on the first mold body, and a plurality of second channels are provided on the second mold body. The outer diameter of the particle positioning hose is consistent with the inner diameter of the support tube, and the outer diameter of the support tube is consistent with the diameter of the first channel / second channel. The radiation dose measurement film is placed on the mating surface of the first mold body and the second mold body.

[0005] As a further improvement of the particle chain exposure film model device of the present utility model, a film placement groove is provided on the mating surface of the first mold body / second mold body, and the depth of the film placement groove is consistent with the thickness of the radiation dose measurement film.

[0006] As a further improvement of the particle chain exposure film model device of the present utility model, a plurality of layers of first channels are provided on the first mold body. The distance of each layer of first channels from the mating surface is different, and each layer contains a plurality of arc-shaped channels with different radian.

[0007] As a further improvement of the particle chain exposure film model device of the present utility model, a plurality of columns of second channels are provided on the second mold body. Each column of second channels includes a plurality of sets of combined channels with different distances from the mating surface. The combined channels include a main channel with a straight axis and two spiral sub-channels around the main channel.

[0008] As a further improvement of the particle chain exposure film model device of the present utility model, a first flared mouth is provided at one end of the particle positioning hose, and a second flared mouth is provided at one end of the support tube.

[0009] As a further improvement of the particle chain exposure film model device of the present utility model, a particle positioning groove is provided in the particle positioning hose.

[0010] As a further improvement of the particle chain exposure film model device of the present utility model, a mold body sealing device is further included, and the mold body sealing device is a radiation shielding container.

[0011] The present utility model is used for measuring the radial dose distribution of a particle chain. A plurality of particles are placed at corresponding positions of the particle positioning hose to form a required particle chain. The particle positioning hose is inserted into the support tube, and the support tube is used to support it so that the shape of the particle chain is the required shape. Then the support tube is inserted into the corresponding-shaped channel on the first mold body or the second mold body. A radiation dose measurement film is placed on the mating surface of the first mold body and the second mold body. The first mold body or the second mold body is buckled and placed for a period of time, and the particle chain irradiates the radiation dose measurement film, thereby measuring the radial dose of the particle chain.

[0012] The utility model can set particle chains with different lengths and arrangements as needed, make the particle chains into different shapes, adopt different combinations of single-chain or multi-chain, control the distance between the particle chain and the radiation dose measurement film, and measure the actual radial dose distribution of the particle chain to verify the dose distribution of the particle chain for clinical treatment and the like. Description of the Drawings

[0013] Figure 1 It is a structural diagram of the first phantom and the second phantom of the utility model.

[0014] Figure 2 It is a structural diagram of the particle positioning hose and the support tube of the utility model.

[0015] Figure 3 It is a top view of the first phantom of the utility model.

[0016] Figure 4 It is a schematic diagram of the auxiliary pipe winding around the main pipe of the utility model.

[0017] In the figure: 1. First phantom; 2. Second phantom; 3. First channel; 4. Second channel; 5. Particle positioning hose; 6. Support tube; 7. Main channel; 8. Auxiliary channel; 9. Film placement groove; 10. Particle; 5-1. First bell mouth; 6-1. Second bell mouth. Detailed Embodiment

[0018] The following combines the drawings to illustrate the detailed embodiment of the utility model.

[0019] As Figure 1 、 Figure 2 shown, the utility model is a particle chain exposure film model device, including a first phantom 1, a second phantom 2, a particle positioning hose 5, a support tube 6, and a radiation dose measurement film.

[0020] Among them, the first module 1 and the second module 2 are hinged to each other. The first module 1 and the second module 2 can be mated around the hinge axis. The mating surfaces of the first module 1 and the second module 2 are of the same size and can be fully mated. A number of first channels 3 are provided on the first module 1, and a number of second channels 4 are provided on the second module 2. The first channels 3 and the second channels 4 are used for threading particle chains. The outer diameter of the particle positioning hose 5 is consistent with the inner diameter of the support tube 6, and the outer diameter of the support tube 6 is consistent with the diameter of the first channel 3 / second channel 4. The particles 10 are placed in the particle positioning hose 5 to form a particle chain. The particle positioning hose 5 is inserted into the support tube 6 with a specific shape, so that the particle chain assumes the required specific shape, and then the support tube 6 is inserted into the first channel 3 or the second channel 4. The radiation dose measurement film is placed on the mating surface of the first module 1 and the second module 2. The radiation dose measurement film generates corresponding color or image changes by receiving the radiation dose of the particle chain, and the dose distribution can be obtained through this change.

[0021] The mating of the first module 1 and the second module 2 plays a role in positioning and fixing the radiation dose film, pressing the radiation dose film tightly and flatly to ensure that the position of the radiation dose film does not change during measurement and movement. At the same time, the first module 1 and the second module 2 serve as carriers for threading particle chains, and the positions, shapes of the particle chains and the spacing from the radiation dose measurement film are controlled by providing different first channels 3 and second channels 4.

[0022] Among them, the first module 1 and the second module 2 include a shell and a tissue-equivalent water phantom material filled inside.

[0023] The materials of the particle positioning hose 5 and the support tube 6 are both tissue-equivalent materials. Among them, the particle positioning hose 5 is made of a flexible tissue-equivalent material, while the support tube 6 is made of a rigid tissue-equivalent material.

[0024] Particle positioning grooves are provided in the particle positioning hose 5, and the particles 10 are placed in the corresponding positioning grooves, thereby determining the positions and spacings of the particles 10 to form the required particle chain. Among them, the particles 10 can be radioactive particles such as 125I particles.

[0025] The support tube 6 is prefabricated into a corresponding shape according to the shape of the particle chain. After the particle positioning hose 5 with particles is inserted into the support tube 6, the particle chain with the corresponding required shape is obtained. Figure 2 Only the case where the support tube 6 is a straight tube is given here. The support tube can also be in the shape of an arc tube, a spiral tube, etc.

[0026] A first flared opening 5-1 is provided at one end of the particle positioning hose 5 to facilitate the implantation of the particles 10, and a second flared opening 6-1 is provided at one end of the support tube 6 to facilitate the insertion of the particle positioning hose 5.

[0027] A film placement groove 9 is provided on the mating surface of the first phantom 1 and the second phantom 2. The depth of the film placement groove 9 is consistent with the thickness of the radiation dose measurement film. After the radiation dose measurement film is placed in the film placement groove 9, it is pressed tightly by the mating of the first phantom 1 and the second phantom 2.

[0028] The first channel 3 on the first phantom 1 and the second channel 4 on the second phantom 2 can be set to different shapes, spacings, heights, etc. as needed.

[0029] In this specific embodiment, as Figure 3 shown, a plurality of layers of first channels 3 are provided on the first phantom 1. The spacing of each layer of the first channels 3 from the mating surface is different, and each layer contains a plurality of arc-shaped channels with different radian values.

[0030] Among them, the spacing of different layers of the first channels 3 from the mating surface can be 1 - 10 mm respectively. Each layer includes channels with different radian values (such as 30°, 60°, 90°, 120°, 150°, 180°, etc.). For each channel, arc length = 2πr × angle / 360. Thus, it can be applied to the dose measurement at different points of arc-shaped particle chains with different radian values and different distances in clinical practice.

[0031] As Figure 4 shown, a plurality of columns of second channels 4 are provided on the second phantom 2. Each column of the second channels 4 includes a plurality of sets of combined channels with different spacings from the mating surface. The combined channels include a main channel 7 with a straight axis and two helical sub-channels 8 around the main channel 7.

[0032] Among them, the distance of the main channel 7 of each column of combined channels from the center position of the phantom can be 1 - 10 mm.

[0033] The lateral spacing and longitudinal spacing of each column of combined channels can be determined according to the measurement requirements.

[0034] Particle chains are arranged in the corresponding main channel 7 and / or sub-channel 8 to adapt to different lengths of particle chains, single-chain, double-chain, multi-chain, helical chains in clinical practice and dose measurement at different points of the particle chains.

[0035] The first phantom and the second phantom can be arranged upside down, which does not affect the normal use of the present invention.

[0036] The present invention further includes a phantom sealing device. The phantom sealing device is a radiation shielding container, and its material is specifically lead glass. The overall shape is a hollow square shell structure. After the first phantom 1 and the second phantom 2 are mated, they can be placed inside it.

[0037] When the utility model is in use, first, a plurality of particles 10 are placed at corresponding positions of the particle positioning hose 5 to form a required particle chain. The particle positioning hose 5 is inserted into the support tube 6, and the support tube 6 is used to support it so that the shape of the particle chain is the required shape. Then, the support tube 6 is inserted into a channel with a corresponding shape on the first mold body 1 or the second mold body 2. A radiation dose measurement film is placed on the mating surface of the first mold body 1 and the second mold body 2. After the first mold body 1 or the second mold body 2 is buckled, it is placed in the mold sealing device for a certain period of time. The radiation dose measurement film is irradiated by the particle chain. After the specified time expires, the radiation dose measurement film is taken out for dose verification.

Claims

1. A particle chain exposure film model device, characterized in that: The invention comprises a first mold body, a second mold body, a particle positioning hose, a support tube and a radiation dose measurement film. The first mold body and the second mold body are hinged to each other, and the first mold body and the second mold body can be matched around a hinge axis. A plurality of first channels are opened on the first mold body, and a plurality of second channels are opened on the second mold body. The outer diameter of the particle positioning hose is consistent with the inner diameter of the support tube, and the outer diameter of the support tube is consistent with the diameter of the first channel / second channel. The radiation dose measurement film is placed on the matching surface of the first mold body and the second mold body.

2. The particle chain exposure film model device according to claim 1 is characterized in that A film placement groove is arranged on the mating surface of the first mold body / the second mold body, and the depth of the film placement groove is consistent with the thickness of the radiation dose measurement film.

3. The particle chain exposure film model device according to claim 1 is characterized in that The first mold body is provided with a plurality of layers of first channels, each layer of the first channels has a different distance from the mating surface, and each layer includes a plurality of arc-shaped channels with different curvatures.

4. The particle chain exposure film model device according to claim 1 is characterized in that The second mold body is provided with a plurality of rows of second channels, each row of second channels includes a plurality of combined channels with different distances from the mating surfaces, and the combined channels include a main channel with a straight axis and two spiral auxiliary channels around the main channel.

5. The particle chain exposure film model device according to claim 1 is characterized in that: A first bell mouth is provided at one end of the particle positioning hose, and a second bell mouth is provided at one end of the support tube.

6. The particle chain exposure film model device according to claim 1 is characterized in that: A particle positioning groove is arranged in the particle positioning hose.

7. The particle chain exposure film model device according to claim 1 is characterized in that: Also included is a mold body sealing device, which is a radiation shielding container.

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