A composite guidance system for brachytherapy

Abstract

The application provides a composite guiding system for brachytherapy, which comprises an image guiding module, a treatment plan confirming module, a guide plate registration module and an implant guide plate adjusting device, the image guiding module is connected with an image scanning device, a doctor terminal and the guide plate registration module respectively, the treatment plan confirming module is connected with the doctor terminal and the guide plate registration module respectively, one end of the implant guide plate adjusting device is connected with a treatment bed plate and an implant guide plate respectively, a position adjusting controller is arranged on the implant guide plate adjusting device, and the guide plate registration module is connected with the position adjusting controller. The composite guiding system for brachytherapy can guide the implant template to implant treatment after the implant guide plate position is finely adjusted to the target position in the brachytherapy plan, so that the implantation effect is better, and the pain caused by the resetting of the patient due to the inaccurate implant guide plate placement position in the treatment is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brachytherapy, in particular to a composite guiding system for brachytherapy. BACKGROUND

[0002] Brachytherapy has a history of more than 100 years, which uses sealed radioactive sources to place the radioactive sources inside or around the tumor to directly irradiate the tumor target area with a prescribed dose. Brachytherapy technology includes two treatment methods: high-dose rate (HDR) interstitial implantation and low-dose rate (LDR) interstitial permanent implantation of radioactive particles. With the development of computer technology and imaging technology, brachytherapy has now completed the transition from two-dimensional to three-dimensional treatment methods. This change enables us to provide more conformal dose irradiation for more complex target volumes, while better protecting normal tissues. Traditional brachytherapy is limited to some simple-to-operate anatomic locations in the human body, especially tumors in gynecological, breast, and skin sites. However, with the development of imaging diagnosis technology and the improvement of understanding of radiation dosimetry and irradiation methods, it has been revealed that tumors in more complex locations can also be treated using this method.

[0003] In 1983, Holm first proposed that a rectal ultrasound probe combined with a guide plate be used to guide the implantation of particles along the long axis of the body through the perineum for the treatment of prostate cancer in the lithotomy position. For decades, standard implantation guides have been widely used.

[0004] In 2002, Chinese experts introduced CT-guided technology into the field of particle implantation therapy, and the accuracy of particle implantation therapy has been significantly improved. In the same year, Liu Shuming et al. developed individualized three-dimensional templates using 3D printing technology and achieved success in the treatment of head and neck tumors. In 2014, Wang Junjie transmitted the scanning information of the tumor target area of the patient to the computer treatment planning system through an imaging digital information system, designed a personalized implantation guide with a coordinate system, fixed needle path, and digital 3D after printing, and used the personalized implantation guide in the process of particle implantation therapy for the patient.

[0005] For the above-mentioned brachytherapy technology using standard implantation guides or personalized implantation guides, the implantation guide needs to be fixed on the patient's body surface or in the natural cavity (vagina, rectum, esophagus, nasopharynx, etc.) of the human body. Due to the factors of the soft tissue around the body surface skin or natural cavity, the accuracy of the repositioning position of the implantation guide is poor. SUMMARY

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present application is to provide an implant guide plate adjusting device for implant guide plate position adjustment, which can solve the problem that the implant guide plate needs to be fixed on the patient's body surface or in the natural cavity of the human body before application, and the accuracy of the reset position of the implant guide plate is poor due to the soft tissue around the body surface skin or natural cavity.

[0007] The purpose of the present application is achieved by adopting the following technical solutions:

[0008] A composite guide system for brachytherapy includes an image guide module, a treatment plan confirmation module, a guide plate registration module, and an implant guide plate adjusting device. The image guide module is connected with an image scanning device, a doctor terminal, and the guide plate registration module. The treatment plan confirmation module is connected with the doctor terminal and the guide plate registration module. One end of the implant guide plate adjusting device is connected with a treatment bed plate and an implant guide plate. A position adjustment controller is arranged on the implant guide plate adjusting device. The guide plate registration module is connected with the position adjustment controller.

[0009] The image guide module sends an image scanning instruction to the image scanning device for image scanning operation on a target patient whose tumor treatment area has been placed with an implant guide plate. The image guide module receives scanning image data containing implant guide plate images and tumor images sent by the image scanning device. The image guide module sends the tumor images in the scanning image data to the doctor terminal for the doctor to develop a corresponding brachytherapy treatment plan. The treatment plan confirmation module receives the brachytherapy treatment plan sent by the doctor terminal and sends it to the guide plate registration module. The guide plate registration module extracts the implant guide plate images in the scanning image data through the image guide module. The guide plate registration module performs registration processing on the implant guide plate according to the brachytherapy treatment plan and the implant guide plate images and obtains a registration result. The guide plate registration module generates an implant guide plate position adjustment instruction according to the registration result and sends it to the position adjustment controller for position guidance of the implant guide plate.

[0010] Further, the implant guide plate is provided with a plurality of implant needle channels. The brachytherapy treatment plan includes planned needle channel information. The implant guide plate image includes implant needle channel information. The registration processing of the implant guide plate according to the brachytherapy treatment plan and the implant guide plate image and the registration result are specifically as follows: the guide plate registration module extracts the implant needle channel information in the implant guide plate image and performs registration with the planned needle channel information. The positional deviation between the virtual implant needle channel corresponding to the implant needle channel information and the planned needle channel of the planned needle channel information is taken as the registration result.

[0011] Further, the extracting the implant needle channel information in the implant guide image specifically comprises: the guide registration module reconstructs virtual implant needle channels according to hole site information in the implant guide image and determines a starting point and an ending point of each virtual needle channel to obtain implant needle channel information.

[0012] Further, the image scanning device is a CT machine or an MRI scanning device.

[0013] Further, the implant guide plate adjusting device comprises a position adjusting plate and an adjusting disc, the treatment bed plate is provided with a limiting groove on each of two symmetrical sides thereof, the implant guide plate is provided with a side strip on each of two symmetrical sides thereof, a horizontal joint groove is located on the position adjusting plate, a limiting block is located below the horizontal joint groove and is movable along the horizontal joint groove, the limiting block is embedded with the side strip, the limiting block is provided with an opening on a surface thereof, the opening is embedded with a limiting pin, the limiting pin is embedded with the limiting block and is clamped into the horizontal joint groove, a vertical joint groove is located at a center of the position adjusting plate in a fan shape, the vertical joint groove is distributed in a vertical state with the horizontal joint groove, the adjusting disc is located in a middle part of the position adjusting plate, the adjusting disc is provided with a through hole in a middle part thereof, the through hole is matched with a connecting column, a twist handle is located at one end of the connecting column, the connecting column is provided with a vertical fixing block at an end away from the twist handle, the vertical fixing block is embedded with a vertical fixing groove formed in a bottom of the treatment bed plate, a horizontal fixing block is located in a horizontal fixing groove formed in a bottom side of the treatment bed plate, a plate groove is located at the bottom side of the treatment bed plate, the plate groove is embedded with the horizontal fixing block, and the adjusting controller is connected with the limiting block and the position adjusting plate.

[0014] Further, the horizontal joint groove comprises a strip-shaped groove and a short groove perpendicular to the strip-shaped groove.

[0015] Further, the twist handle is fixed at 90 degrees with the vertical fixing block in a long side direction and is moved at 0 degrees.

[0016] Further, the vertical fixing block is an elliptical block, and the vertical fixing groove is an elliptical groove.

[0017] Further, the horizontal fixing block is a T-shaped block, and the horizontal fixing groove is a T-shaped groove.

[0018] Further, the adjusting disc is a circular disc.

[0019] Compared with the prior art, the beneficial effects of the application are that: the composite guiding system for brachytherapy in the application obtains scanning image data containing the implant guide plate image and the tumor image through the image guiding module, receives the brachytherapy treatment plan sent by the doctor terminal, performs registration processing on the implant guide plate according to the implant guide plate image in the scanning image data and the brachytherapy treatment plan, and obtains a registration result, then the guide plate registration module generates an implant guide plate position adjustment instruction according to the registration result and sends it to the position adjustment controller for position guiding of the implant guide plate, and after the implant guide plate position is finely adjusted to the target position in the brachytherapy treatment plan, the implant template guiding implantation treatment is performed, the implantation effect is better, and the pain caused by the repositioning of the patient in the treatment due to the inaccurate implant guide plate placement is avoided.

[0020] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and the content of the specification can be implemented. The following is a detailed description of the preferred embodiments of the application with reference to the accompanying drawings. The specific embodiments of the application are described in detail by the following examples and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and their descriptions are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0022] Figure 1 The architecture block diagram of a composite guiding system for brachytherapy of the application;

[0023] Figure 2 The top view schematic diagram of the implant guide plate adjusting device in the composite guiding system for brachytherapy of the application;

[0024] Figure 3 The side view schematic diagram of the implant guide plate adjusting device in the composite guiding system for brachytherapy of the application.

[0025] In the drawings: 10, treatment bed plate; 20, implant guide plate; 30, edge strip; 40, position adjusting plate; 50, limiting block; 60, horizontal joint groove; 70, limiting pin; 80, limiting groove; 90, adjusting disc; 100, twist handle; 110, connecting column; 120, longitudinal fixing block; 130, longitudinal joint groove; 140, transverse fixing block; 150, plate groove; 160, through hole. DETAILED DESCRIPTION

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] like Figure 1 As shown, a composite guidance system for brachytherapy according to this application includes an image guidance module, a treatment plan confirmation module, a guide plate registration module, and an insertion guide plate adjustment device. The image guidance module is connected to an image scanning device, a doctor's terminal, and the guide plate registration module. The treatment plan confirmation module is connected to the doctor's terminal and the guide plate registration module. One end of the insertion guide plate adjustment device is connected to the treatment bed and the insertion guide plate. The insertion guide plate adjustment device is equipped with a position adjustment controller, and the guide plate registration module is connected to the position adjustment controller.

[0028] like Figures 2-3 As shown, the insertion guide plate adjustment device is connected to the treatment bed board 10 and the insertion guide plate 20. The treatment bed board 10 has symmetrical limiting grooves 80 on both sides; the insertion guide plate 20 has symmetrical side strips 30 on both sides; the transverse groove 60 is located on the adjustment plate 40; the limiting block 50 is located below the transverse groove 60 and can move along the transverse groove 60. The limiting block 50 is engaged with the side strip 30, and the surface of the limiting block 50 has an opening that engages with the limiting pin 70; after engaging with the limiting block 50, the limiting pin 70 is inserted into the transverse groove 60; the lower part of the longitudinal groove 130 is fan-shaped and located at the center of the adjustment plate 40. The adjustment plate 90 is located in the middle of the adjustment plate 40 and has a through hole 160 in the middle, which is engaged with the connecting post 110. The torque handle 100 is located at one end of the connecting post 110. The end of the connecting post 110 away from the torque handle 100 is provided with a longitudinal fixing block 120, which can be fitted with the longitudinal fixing groove at the bottom of the treatment bed board 10. The transverse fixing block 140 is located in the transverse fixing groove at the bottom side of the treatment bed board 10. The plate groove 150 is located at the bottom side of the treatment bed board 10 and is engaged with the transverse fixing block 140.

[0029] In the present application, the edge strips 30 on both sides of the implant guide plate 20 are movably connected with the limiting blocks 50, and the limiting blocks 50 on both sides can fix the position of the implant guide plate 20; the limiting blocks 50 are matched with the groove structure on the position adjusting plate 40, and the limiting blocks 50 can slide in the groove on the position adjusting plate 40; the limiting pins 70 are matched with the limiting blocks 50 and the horizontal joint grooves 60 respectively; the twist handle 100 is fixedly connected with the connecting column 110 and the longitudinal fixing block 120, one end of the connecting column 110 is fixedly connected with the twist handle 100, and the other end is fixedly connected with the longitudinal fixing block 120, and the twist handle 100 is at a 90-degree angle with the long side direction of the longitudinal fixing block 120; the surface of the position adjusting plate 40 is provided with a groove for placing the adjusting disc 90, the adjusting disc 90 is provided with a circular hole, the connecting column 110 is inserted into the circular hole, thereby limiting the position of the connecting column 110; the horizontal fixing block 140 is fixedly connected with the position adjusting plate 40, and is matched with the groove on the bottom side of the treatment bed plate 10, and the horizontal fixing block 140 is mainly used for limiting the horizontal and vertical movement of the position adjusting plate 40; the longitudinal fixing block 120 is matched with the fan-shaped groove structure on the bottom side of the treatment bed plate 10, and the matching realizes the longitudinal fixation of the position adjusting plate 40, and after rotating 90 degrees, the purpose of moving the position adjusting plate 40 is realized, thereby effectively solving the problems that the existing implant guide plate has no implant guide plate adjusting device, the implant guide plate may move during the treatment of the patient, and the position of the implant guide plate cannot be adjusted in multiple directions.

[0030] As a preferred embodiment, the horizontal joint groove 60 comprises a strip-shaped groove and a short groove perpendicular to the strip-shaped groove, thereby facilitating the limitation of the position of the horizontal movement of the implant guide plate 20.

[0031] As a preferred embodiment, the number of the short grooves is 8-24, thereby facilitating the limitation of the position of the horizontal movement of the implant guide plate 20.

[0032] As a preferred embodiment, the number of the limiting pins 70 is 4-8, thereby facilitating the fixation of the implant guide plate 20.

[0033] As a preferred embodiment, the number of the limiting pins 70 is 4, and the limiting pins 70 are combined in pairs and can be simultaneously disassembled, thereby facilitating the fixation of the implant guide plate 20 and saving cost.

[0034] As a preferred embodiment, the twist handle 100 is at a 90-degree angle with the long side direction of the longitudinal fixing block 120 when fixed, and is at a 0-degree angle when moved, thereby facilitating the longitudinal fixation of the position adjusting plate 40.

[0035] As a preferred embodiment, the longitudinal fixing block 120 is an elliptical block, and the longitudinal fixing groove is an elliptical groove, thereby facilitating the matching and realizing the fixed purpose.

[0036] As a preferred embodiment, the number of the longitudinal fixing grooves is 8-24, thereby facilitating the longitudinal fixation of the position adjusting plate 40.

[0037] As a preferred implementation, the transverse fixing block 140 is a T-shaped block, and the transverse fixing groove is a T-shaped groove, so as to facilitate the cooperation and fixation.

[0038] As a preferred implementation, the adjusting disc 90 is a circular disc, so as to facilitate the limitation of the movement of the connecting column 110, the circular disc cooperates with the positioning plate 40, the circular disc is provided with a hole cooperating with the connecting column 110, and the connecting column 110 cooperates with the circular disc, so that the rotation of the connecting column 110 can be realized and the connecting column 110 cannot move forward, backward, leftward or rightward.

[0039] The working principle is as follows:

[0040] The image guidance module sends an image scanning instruction to the image scanning device for performing an image scanning operation on a target patient whose tumor treatment area has been placed with an implant guide plate. The image scanning device scans the target patient according to the image scanning instruction to obtain scanning image data, which includes a tumor image and an implant guide plate image. The implant guide plate image includes implant needle channel information, i.e., position information and depth information of each implant needle channel. The implant guide plate used in brachytherapy technology is provided with a plurality of implant needle channels for implant treatment. During treatment, a certain dose of radioactive material is injected into the tumor target area through the implant needle channel to achieve the purpose of particle implantation treatment.

[0041] The image scanning device sends the obtained scanning image data to the image guidance module. The image guidance module sends the tumor image in the scanning image data to the doctor terminal for the doctor to formulate a corresponding brachytherapy treatment plan. The doctor receives the tumor image corresponding to the target patient through the doctor terminal and formulates a brachytherapy treatment plan for the target patient according to the tumor position information in the tumor image. The brachytherapy treatment plan includes planned needle channel information, which is essentially treatment position information determined according to the tumor position information for treating the target patient, i.e., the position profile of the implant needle channel in the target patient's body surface or natural body cavity in the plan. The planned needle channel information specifically includes the number of needle channels, the starting point coordinates and the ending point coordinates of each needle channel, the length of the needle channel, and the like. The treatment plan confirmation module receives the brachytherapy treatment plan sent by the doctor terminal and sends it to the guide plate registration module.

[0042] In the embodiment, the guide plate registration module extracts the implant guide plate image from the scanning image data by a threshold segmentation method or a deep learning method, obtains the segmented implant guide plate image, and reconstructs a virtual implant needle path according to the hole site information in the implant guide plate image and determines the starting point and the ending point of each virtual needle path to obtain implant needle path information. The guide plate registration module extracts the implant needle path information in the implant guide plate image and performs registration with the planned needle path information, and takes the positional deviation between the virtual implant needle path corresponding to the implant needle path information and the planned needle path in the planned needle path information as the registration result. The registration process is as follows: the ending points of all needle paths in the planned needle path information are established as a planned needle path ending point set, the ending points of the needle paths in the implant needle path information are collected as an implant needle path ending point set, the least square method is used to make the distance between the two sets closest, the positional deviation of the two is obtained as the positional deviation, and the positional deviation is taken as the registration result.

[0043] The guide plate registration module generates implant guide plate position adjustment instructions according to the registration result and sends them to the position adjustment controller for position guidance of the implant guide plate. In the embodiment, the guide plate position adjustment instructions are difference guide plate position moving values obtained according to the positional deviation, including a transverse moving value and a longitudinal moving value; the position adjustment controller is connected with the limiting block and the position adjusting plate respectively, and after receiving the position adjustment instructions, the position adjustment controller drives the limiting block to move according to the transverse moving value in the instructions, so that the implant guide plate reaches the required position in the transverse position; the position adjustment controller drives the position adjusting plate according to the longitudinal moving value in the instructions, so that the position adjusting plate moves in the longitudinal position, and when the position adjusting plate moves to the specified position, the twist grip is rotated by 90 degrees again, so that the longitudinal fixed block is at a right angle with the longitudinal slot, and the longitudinal fixed block cooperates with the slot structure of the treatment bed plate to fix the longitudinal position of the position adjusting plate. The longitudinal position of the implant guide plate is adjusted by adjusting the longitudinal position of the position adjusting plate. The implant guide plate is moved to the registered position through the above-mentioned longitudinal position and transverse position adjustment. The position adjustment controller is a moving adjustment device including a transverse telescopic rod connected with the limiting block and a longitudinal telescopic rod connected with the position adjusting plate. The transverse telescopic rod and the longitudinal telescopic rod are driven to move in the corresponding direction by the internal motor, so that the limiting block and the adjusting plate are driven to move in the corresponding direction.

[0044] In the embodiment, after the position of the implantation guide plate is guided, the implantation surgery is performed on the target patient under the guidance of the implantation guide plate, the image scanning device is instructed by the image guidance module to re-scan the image of the target patient who is undergoing the implantation surgery; the image guidance module sends the re-scanned image to the doctor terminal, the doctor confirms the depth of the implantation needle again according to the image obtained by re-scanning, obtains the implantation result in the implantation surgery process, and then optimizes the aforementioned brachytherapy treatment plan according to the implantation result, to obtain a more accurate treatment plan, and performs brachytherapy on the target patient according to the plan.

[0045] In the embodiment, the implantation guide plate is a standard implantation guide plate or a personalized guide plate. If it is a personalized implantation guide plate, the personalized implantation guide plate needs to be made in advance, which specifically includes the following processes:

[0046] For patients who need to undergo brachytherapy, the positioning image scanning is performed to obtain initial image data, and different patients can adopt different technologies according to their actual conditions, such as: for cervical cancer patients, a uterine cavity tube can be inserted for scanning or a standard or personalized applicator can be worn for scanning; for prostate cancer patients, a positioning anal plug can be worn for positioning, etc. Based on the aforementioned initial image data, a brachytherapy pre-plan that meets the clinical needs is formulated according to the prescription dose given by the doctor, and a personalized implantation guide plate is made, and at the same time, the implantation guide plate is added with the implantation guide plate adjusting device, so that it can be adjusted in the front, back, left and right directions.

[0047] The composite guidance system for brachytherapy in the application obtains the scanning image data containing the implantation guide plate image and the tumor image through the image guidance module and receives the brachytherapy treatment plan sent by the doctor terminal, uses the guide plate registration module to perform registration processing on the implantation guide plate according to the implantation guide plate image in the scanning image data and the brachytherapy treatment plan and obtains a registration result, and then the guide plate registration module generates an implantation guide plate position adjustment instruction according to the registration result and sends it to the position adjustment controller for position guidance of the implantation guide plate. After the implantation guide plate position is finely adjusted to the target position in the brachytherapy treatment plan, the implantation template guides the implantation treatment, a better implantation effect is obtained, the pain caused by the repositioning of the patient in the treatment due to the inaccurate placement position of the implantation guide plate is avoided, the needle channel is guided by the implantation guide plate, and the patient receives a treatment with a more optimal dose distribution. In addition, the position adjustment of the implantation guide plate is realized through the implantation guide plate adjusting device, and the implantation guide plate is reinforced, the offset caused by the above reasons is eliminated, and the implantation guide plate will not slip during the treatment,

[0048] The above is only the preferred embodiment of the present application, and does not limit the present application in any form; any person skilled in the art can easily implement the present application according to the drawings and the above; however, any person skilled in the art can make some changes, modifications and equivalent changes within the scope of the technical solutions of the present application, and the equivalent embodiments of the present application are disclosed above; at the same time, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application are still within the protection scope of the technical solutions of the present application.

Claims

1. A composite guidance system for brachytherapy, characterized by: The application relates to an image-guided radiotherapy system, which comprises an image-guiding module, a treatment plan confirmation module, a guide plate registration module and an implant guide plate adjusting device, wherein the image-guiding module is connected with an image scanning device, a doctor terminal and the guide plate registration module; the treatment plan confirmation module is connected with the doctor terminal and the guide plate registration module; one end of the implant guide plate adjusting device is connected with a treatment bed plate and an implant guide plate; a position adjusting controller is arranged on the implant guide plate adjusting device; and the guide plate registration module is connected with the position adjusting controller. The image-guiding module sends an image scanning instruction to the image scanning device for image scanning operation on a target patient whose tumor treatment area has been placed with an implant guide plate; the image-guiding module receives scanning image data containing implant guide plate images and tumor images sent by the image scanning device; the image-guiding module sends the tumor images in the scanning image data to the doctor terminal for the doctor to formulate a corresponding brachytherapy treatment plan; the treatment plan confirmation module receives the brachytherapy treatment plan sent by the doctor terminal and sends the brachytherapy treatment plan to the guide plate registration module; the guide plate registration module extracts the implant guide plate images in the scanning image data through the image-guiding module; the guide plate registration module performs registration processing on the implant guide plate according to the brachytherapy treatment plan and the implant guide plate images and obtains a registration result; and the guide plate registration module generates an implant guide plate position adjusting instruction according to the registration result and sends the implant guide plate position adjusting instruction to the position adjusting controller for position guidance of the implant guide plate.

2. A composite guidance system for brachytherapy according to claim 1, wherein: The implant guide plate is provided with a plurality of implant needle channels; the brachytherapy treatment plan comprises planned needle channel information; the implant guide plate images comprise implant needle channel information; and the registration processing on the implant guide plate according to the brachytherapy treatment plan and the implant guide plate images and the registration result are specifically that the guide plate registration module extracts the implant needle channel information in the implant guide plate images and performs registration with the planned needle channel information; and the position deviation between the virtual implant needle channel corresponding to the implant needle channel information and the planned needle channel of the planned needle channel information is taken as the registration result.

3. A composite guidance system for brachytherapy according to claim 2, wherein: The extraction of the implant needle channel information in the implant guide plate images is specifically that the guide plate registration module reconstructs virtual implant needle channels according to hole position information in the implant guide plate images and determines the starting point and the ending point of each virtual needle channel to obtain implant needle channel information.

4. A composite guidance system for brachytherapy according to claim 1, wherein: The image scanning device is a CT machine or an MRI scanning device.

5. A composite guidance system for brachytherapy according to claim 1, wherein: The implantation guide plate adjusting device comprises a position adjusting plate and an adjusting disc, the treatment bed plate is respectively provided with a limiting groove on the symmetrical two sides; the implantation guide plate is respectively provided with an edge strip on the symmetrical two sides; a transverse slot is located on the position adjusting plate; a limiting block is located below the transverse slot and can move along the transverse slot, the limiting block is respectively embedded with the edge strip, the surface of the limiting block is provided with an opening, the opening is embedded with a limiting pin; the limiting pin is embedded with the limiting block and is clamped into the transverse slot; a longitudinal slot is located at the center position of the position adjusting plate in a fan shape, the longitudinal slot is distributed in a vertical state with the transverse slot; the adjusting disc is located in the middle part of the position adjusting plate, a through hole is formed in the middle part of the adjusting disc, the through hole is matched with a connecting column; a twist handle is located at one end of the connecting column; a longitudinal fixing block is arranged at the end of the connecting column away from the twist handle, the longitudinal fixing block can be embedded with a longitudinal fixing groove formed in the bottom of the treatment bed plate; a transverse fixing block is located in a transverse fixing groove formed in the bottom side of the treatment bed plate; a plate groove is located at the bottom side of the treatment bed plate, the plate groove is embedded with the transverse fixing block, the adjusting controller is respectively connected with the limiting block and the position adjusting plate.

6. A composite guidance system for brachytherapy according to claim 5, wherein: The transverse slot comprises a strip-shaped groove and a short groove perpendicular to the strip-shaped groove.

7. A composite guidance system for brachytherapy according to claim 5, wherein: When the twist handle is fixed with the longitudinal fixing block in the long direction, the twist handle is 90 degrees, and when the twist handle is moved, the twist handle is 0 degrees.

8. A composite guidance system for brachytherapy according to claim 5, wherein: The longitudinal fixing block is an elliptical block, and the longitudinal fixing groove is an elliptical groove.

9. A composite guidance system for brachytherapy according to claim 5, wherein: The transverse fixing block is a T-shaped block, and the transverse fixing groove is a T-shaped groove.

10. A composite guidance system for brachytherapy according to claim 5, wherein: The adjusting disc is a circular disc.

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