Boron neutron capture therapy system

Abstract

To provide a boron neutron capture therapy system which does not require manual cutting operation, reduces radiation risk, and improves operation efficiency of target automatic exchange, movement, storage, and monitoring.SOLUTION: A current monitoring device is disposed outside the beam shaping assembly, a movable contact is disposed on the target assembly, and a fixed contact is disposed on the current monitoring device to form a moving-contact conduction mode with the movable contact. In the boron neutron capture therapy system, the current monitoring device is connected to the target assembly in a moving-contact conduction mode, and a hard-wired connection is adopted to avoid affecting the movement, automatic replacement, accommodation and the like of the target assembly, so that the operations of contact conduction and non-contact conduction can be automatically adjusted, and the target current can be measured and read in real time in a fully automatic situation.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of boron neutron capture therapy, and in particular to boron neutron capture therapy systems. [Background technology]

[0002] Target current monitoring is a requirement for measuring general target and accelerator conditions. Accelerator accelerated beams are charged particles, so when they are deposited on the target, they are conducted as electric current.

[0003] In order to extract the current from the target, it is necessary to insulate the target from multiple components such as the accelerator and the beam shaper, and to connect the insulated target to an ammeter with an electric wire to read the current.

[0004] In boron neutron capture therapy, the fixed target is positioned differently from other neutron source applications. The target is surrounded by a beam shaping system and is highly radioactive. If an electric wire directly connects the target to the ammeter, the electric wire will pull the ammeter when replacing the target, affecting the equipment. In addition, the connection between the target and the ammeter must be manually disconnected in a radiation environment, which causes radiation problems. Furthermore, the electric wire is too long, making it inconvenient to store the target in a waste target box, and if the electric wire gets caught in the opening and closing part of the waste target box, radiation leakage will occur.

[0005] Therefore, it is necessary to design a target dark current monitoring device in an integrated environment such as boron neutron capture therapy, automatic target exchange, and beam adjustment by moderator exchange, so that the target current can be read in a fully automatic situation, without affecting the automatic target exchange and storage, and without restricting the adjustment of the target position in the beam shaping body BSA by moderator exchange. Summary of the Invention [Problem to be solved by the invention]

[0006] The purpose of the present invention is to solve the problems of target dark current monitoring in an integrated environment such as conventional boron neutron capture therapy, target replacement, and beam adjustment by moderator replacement, where the electrical wires pull the ammeter, affecting the equipment, and the connection between the target and the ammeter must be manually disconnected in a radiation environment, which causes the influence of radiation, and the electrical wires are too long, which can cause radiation leakage during the process of accommodating discarded targets.To do this, the purpose of the present invention is to provide a boron neutron capture therapy system that can read the target current in a fully automatic environment, does not affect the automatic target replacement and accommodation, and does not restrict the adjustment of the target position in the beam shaper BSA by moderator replacement. [Means for solving the problem]

[0007] The technical solution adopted by the present invention to achieve the object of the invention is as follows: A boron neutron capture therapy system including a beam shaper with a proton channel and an exchangeable target assembly installed inside the proton channel, wherein a current monitoring device is installed outside the beam shaper, a movable contact is installed on the target assembly, and a fixed contact is installed on the current monitoring device, which forms a moving contact conduction mode with the movable contact. In this boron neutron capture therapy system, by installing a current monitoring device for real-time target current monitoring outside the beam shaper, and in response to the characteristics of the target assembly needing to be replaced and sliding in and out of the proton channel depending on usage, a direct hard connection between the current monitoring device and the target assembly via lead wires is not used, but a moving contact conduction mode connection is used, thereby avoiding the impact on automatic target assembly replacement and storage, and not restricting the adjustment of the target assembly's position movement in the beam shaper due to moderator replacement, and enabling automatic adjustment of contact current application and non-contact cutting operations. To achieve the moving contact conduction mode, the target assembly is provided with a movable contact that moves with the target assembly, the current detection device is provided with a fixed contact that can be installed relatively stationary on the current monitoring device, and the current monitoring device is installed outside the beam shaping body so that it does not move and can contact the movable contact, thereby achieving contact path conduction and non-contact interruption between the target assembly and the current monitoring device, and achieving fully automated monitoring of target dark current without the need to manually disconnect the target assembly from the current monitoring device. The boron neutron capture therapy system is used for target dark current measurement in an integrated environment such as boron neutron capture therapy, automatic target replacement, and beam adjustment through moderator replacement, and can measure and read the target current in real time under fully automated conditions.During the process of automatic target exchange and target storage, it is necessary to manually disconnect the target from the current monitoring equipment in a radiation environment, which not only poses radiation risks but also has disadvantages for automated operation. Therefore, by using automated equipment such as manipulators, fully automatic and rapid target exchange can be realized, and the position of the target assembly can be quickly and arbitrarily moved and adjusted as needed, which meets the need for the target assembly to enter different positions inside the beam shaping body and enables rapid and automatic storage of discarded targets.

[0008] Preferably, the movable contact and the fixed contact are installed in a contact path device that realizes a moving contact conductive mode. To realize the moving contact conductive mode connection, a contact path device is installed between the target assembly and the current monitoring device, and the movable contact and the fixed contact are installed in the contact path device, so that the contact conductive path and non-contact cutoff can be realized as needed, and the influence of pulling on the current monitoring device during the target assembly movement and replacement process can be effectively avoided.

[0009] Preferably, the contact path device includes a variable positioning on / off assembly slidably installed on the target assembly and a contact conducting assembly installed outside the beam shaper. The contact path device is mainly realized by the variable positioning on / off assembly installed on the target assembly and the contact conducting assembly installed outside the beam shaper, and the variable positioning on / off assembly can slide axially along the target assembly and be used to adjust the position at which the target assembly protrudes into the beam shaper, and regardless of how the position at which the target assembly protrudes into the beam shaper changes, the variable positioning on / off assembly can perform contact conducting and non-contact cutting operations with the external contact conducting assembly, and such contact path is installed on the target assembly and the outside of the beam shaper, respectively, so that during the target assembly replacement process, the variable positioning on / off assembly moves, replaces, and accommodates the target assembly without interfering with the contact conducting assembly and without requiring manual disconnection operations, reducing radiation risks and improving the operational efficiency of automatic target replacement.

[0010] Preferably, the movable contact is mounted on a variable positioning on-off assembly, and the fixed contact is mounted on a contact conducting assembly, so that when the variable positioning on-off assembly and the contact conducting assembly are in contact and conducting, a current monitoring path is formed between the target assembly, the variable positioning on-off assembly, the contact conducting assembly, and the current monitoring device. The contact between the variable positioning on-off assembly and the contact conducting assembly forms a current monitoring path between the target assembly, the variable positioning on-off assembly, the contact conducting assembly, and the current monitoring device, allowing current to be monitored in real time. When the contact is broken, there is no connection between the respective components, allowing automatic operations such as moving, replacing, and storing the target assembly.

[0011] Preferably, the variable positioning on-off assembly includes an insulating slide positioning member, to which a contact movable member is fixed and which is electrically connected to the target assembly by a conductive path. The variable positioning on-off assembly mainly uses a slide positioning member that is installed insulated from the target assembly to fix the contact movable member to the slide positioning member, and the conductive contact member is electrically connected to the target body of the target assembly by a relatively short or expandable conductive path, so that when it is necessary to draw and monitor the target current, the contact movable member simply contacts the external contact conductive assembly to form a path for detection.

[0012] Preferably, the movable contact is mounted on the contact movable member, or the contact movable member forms the movable contact. The movable contact may be a metal contact mounted on the contact movable member, or may have various different shapes such as a metal spring contact, a metal probe, etc., or the conductive movable contact member may be directly mounted on the movable contact.

[0013] Preferably, a slide groove is provided on the target assembly, and the slide positioning member is slidably installed within the slide groove and is located outside the beam shaping body. In order to adjust the position of the slide positioning member relative to the target assembly and keep it always outside the beam shaping body, a preferred solution is to provide a slide groove on the target assembly, and achieve axial sliding adjustment by fitting the slide positioning member into the slide groove. The slide groove may be directly opened on the target assembly, or may be fixed to the target assembly by a slide base with a slide groove. The position and shape of the slide groove are not limited, as long as relative sliding is achieved.

[0014] Preferably, the contact conducting assembly includes a contact fixing member that is installed outside the beam shaper and on the outer edge of the proton channel, and the contact fixing member is electrically connected to the current monitoring device. The contact conducting assembly is mainly realized by the contact fixing member, and the contact fixing member is electrically connected to the external current monitoring device, so that the contact fixing member and the current monitoring device do not need to be manually disconnected or removed, and automatic electrical connection between the target assembly and the current monitoring device can be realized.

[0015] Preferably, the fixed contact is mounted on the fixed contact member, or the fixed contact member forms the fixed contact. The fixed contact may be a metal contact mounted on the fixed contact member, or may be a metal spring contact, a metal sheet, or other conductive material, or the conductive movable fixed contact member may be directly mounted on the fixed contact.

[0016] Preferably, the contact fixing member is fixed to the outside of the beam shaper, or the contact fixing member is movably installed on the beam shaper. The contact fixing member may be directly fixed to the front reflector of the beam shaper and fixed at a location close to the outer edge of the proton channel, or if necessary, a slide rail may be installed on the beam shaper, and the contact conducting assembly may be slidably installed on the slide rail to adjust the position of the contact conducting assembly, so as to meet the needs of the slide positioning member on the target assembly being in different positions after being inserted into the proton channel, and the purpose of sliding the contact conducting assembly is to eliminate the need to consider the specific direction of the slide positioning member when replacing the target assembly.

[0017] Preferably, the target assembly includes a cylinder and a target body, the target body being installed at one end where the cylinder extends into the interior of the beam shaper, and the target body, the contact passage device, and the current monitoring device form a passage.

[0018] Preferably, the current monitoring device includes an external monitoring and display device, which can be installed outside the beam shaper, or can be installed away from the beam shaper, i.e., away from the radiation source, making it easy to observe monitoring data in real time in a radiation-free environment.

[0019] Preferably, the target assembly is provided with a scale for adjusting the position, which facilitates automatic target replacement and adjustment of target position movement, and allows the target body to adjust the distance it penetrates into the beam shaper as needed, making the adjustment more accurate. [Effects of the Invention]

[0020] The beneficial effects of the present invention are as follows: (1) The boron neutron capture therapy system is connected between the current monitoring device and the target assembly by a moving contact conductive mode, and adopts a hard-wired connection to avoid any influence on the movement, automatic replacement, and storage of the target assembly, and can automatically adjust the operation of contact current application and non-contact cut-off.

[0021] (2) It is used for target dark current measurement in integrated environments such as boron neutron capture therapy, automatic target exchange, and beam adjustment with moderator exchange. It can provide real-time measurement readings for target current in fully automatic situations, and meets the needs of moving adjustment when the target enters different positions inside the beam shaping body.

[0022] (3) The variable positioning on / off assembly moves, replaces, and accommodates the target assembly together, does not interfere with the contact conductive assembly, and does not require manual disconnection operations, reducing radiation risks and improving the operational efficiency of automatic target replacement, movement, accommodation, and monitoring. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a structural schematic diagram of a boron neutron capture therapy system of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of the boron neutron capture therapy system of the present invention from another angle. [Figure 3] FIG. 2 is a structural schematic diagram of the backsight angle of the boron neutron capture therapy system of the present invention. [Figure 4] 1 is a cross-sectional view of a boron neutron capture therapy system of the present invention. [Figure 5] FIG. 2 is a cross-sectional view of another direction of the boron neutron capture therapy system of the present invention. [Figure 6] FIG. 6 is an enlarged view of a portion A in FIG. 5. [Figure 7] 1 is a schematic diagram of a connection structure between a contact-type passage device and a target assembly in the present invention; [Figure 8] 1 is a structural schematic diagram of a contact-type passage device according to the present invention; [Figure 9]1 is a structural schematic diagram of a variable positioning on / off assembly according to the present invention; [Figure 10] 3 is a structural schematic diagram of a slide groove on a cylindrical body in the present invention. FIG. [Figure 11] 10 is a schematic diagram of another connection structure between the contact-type passage device and the target assembly in the present invention. FIG. [Figure 12] FIG. 10 is a schematic diagram of a third type of connection structure between the contact-type passage device and the target assembly in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Various aspects of the present invention will now be described in detail with reference to specific embodiments and drawings.

[0025] (Embodiment 1) In the embodiment shown in Figures 1 and 5, the boron neutron capture therapy system includes a beam shaper 1 with a proton channel 4, and an exchangeable target assembly 2 that is slidably installed inside the proton channel 4 and can be replaced as needed, and a current monitoring device 3 is installed on the outer edge of the beam shaper 1 near the proton channel 4, and the target assembly 2 and the current monitoring device 3 are connected in a movable contact conductive mode by a contact passage device 5 without using a hard line connection.

[0026] As shown in Figures 7 and 8, the target assembly 2 includes a cylinder 6 and a target body 7, and the target body 7 is installed at one end of the cylinder 6 where it extends into the interior of the beam shaping body 1, and the target body 7, the contact-type passage device 5, and the current monitoring device 3 form a passage.

[0027] To achieve the moving-contact conductive mode connection, the contact path device 5 includes a variable positioning on / off assembly 10 that is slidably installed in the cylinder 6 inside the target assembly 2, and a contact conducting assembly 11 that is installed outside the beam shaper 1 and realizes a separate installation from the variable positioning on / off assembly 10. When the variable positioning on / off assembly 10 and the contact conducting assembly 11 are in contact and conducting, a current monitoring path is formed between the target assembly 2, the variable positioning on / off assembly 10, the contact conducting assembly 11, and the current monitoring device 3. When the variable positioning on / off assembly 10 and the contact conducting assembly 11 are not in contact, the target assembly 2, the variable positioning on / off assembly 10, the contact conducting assembly 11, and the current monitoring device 3 are cut off and no electrical conduction occurs between them.

[0028] To realize contact path conduction and non-contact cutoff, a movable contact 21 is installed in the variable positioning on-off assembly 10 of the target assembly, and a fixed contact 31 is installed in the contact conduction assembly 11 of the current monitoring device 3, which forms a moving contact conduction mode with the movable contact 21. The movable contact 21 contacts the fixed contact 31 to conduct the path, and cuts off without contact.

[0029] 6 and 9, the variable positioning on-off assembly 10 mainly includes a slide positioning member 101 installed insulated from the target assembly, a contact movable member 102 fixed to the slide positioning member 101, the contact movable member 102 connected to the target body 7 by a conductive path 103, and the movable contact 21 installed on the contact movable member 102. In another embodiment, the contact movable member 102 forms the movable contact.

[0030] In order to realize axial sliding of the slide positioning member 101 relative to the target assembly, a slide groove 12 is provided in the target assembly 2, and the slide positioning member 101 is slidably installed inside the slide groove 12. After the target assembly is installed inside the proton channel, the slide positioning member 101 is always located outside the beam shaper 1 and is limited by the outer edge of the proton channel 4.

[0031] The contact conducting assembly 11 includes a contact fixing member 112 located outside the beam shaper 1 and at the outer edge of the proton channel, the contact fixing member 112 being electrically connected to the current monitoring device 3, and the contact fixing member 112 forms the fixed contact 31. In another embodiment, the fixed contact 31 is located on the contact fixing member 112.

[0032] The contact fixing member 112 is fixed to the outer edge of the beam shaper 1 near the proton channel 4, and easily forms contact conduction with the contact movable member 102. In another embodiment, the contact fixing member 112 may be installed on the beam shaper 1 so as to be movable along the outer edge of the proton channel.

[0033] The current monitoring device 3 includes a monitoring and display device 8 that is externally mounted near the exterior of the beam shaper 1 or remote from the beam shaper. The monitoring and display device 8 may be a milliampere meter, an oscillograph, or any other device that provides a current monitoring and display function.

[0034] (Embodiment 2) In the embodiment shown in FIGS. 2, 3 and 4, the boron neutron capture therapy system includes a beam shaper 1, a target assembly 2 and a current monitoring device 3.

[0035] The beam shaper 1 is provided with a beam shaper BSA proton channel 4 that fits into the target assembly 2 .

[0036] The target assembly 2 and the current monitoring device 3 are connected in a moving contact conductive mode, not in a direct wire connection conductive mode. To achieve the moving contact conductive mode connection, a contact passage device 5 is installed between the target assembly 2 and the current monitoring device 3.

[0037] The target assembly 2 includes a cylinder 6 and a target body 7. The cylinder 6 is connected to a target vacuum tube segment 62. The target vacuum tube segment 62 is an insulator. In use, the target vacuum tube segment 62 is located outside the beam shaper, and the cylinder 6 is located within the beam shaper BSA proton channel 4 and extends into the beam shaper. The target vacuum tube segment 62 is fixedly or movably connected to one end of the cylinder 6 that is outside the beam shaper 1. The target vacuum tube segment 62 and the cylinder 6 may be threaded or fixedly welded together, or a flange-type connection between the two (see FIG. 11 ) may be achieved by installing a flange on the cylinder 6 and installing a flange on the target vacuum tube segment 62.

[0038] The target body 7 is installed at the end of the cylindrical body 6, and the target body 7 and the cylindrical body 6 are slidably adjustable along the beam shaper BSA proton channel 4 so as to protrude into and out of the interior of the beam shaper.

[0039] The current monitoring device 3 includes a monitoring and display device 8 and a connecting lead wire 9, and the monitoring and display device 8 may be a milliampere meter, an oscillograph, or a display device that can directly read the current data.

[0040] The contact passage device 5 includes a variable positioning on / off assembly 10 slidably installed on the cylinder 6 , and a fixed or movable contact conducting assembly 11 installed outside the beam shaper 1 .

[0041] The variable positioning on-off assembly 10 includes a slide positioning member 101, a contact movable member 102 mounted on the slide positioning member 101, and a conductive path 103 connecting the contact movable member 102 and the target body 7. In this embodiment, the contact movable member 102 forms the movable contact 21.

[0042] Specifically, a slide groove 12 is provided on the cylinder 6. An adjustment scale can be selectively provided on the edge of the slide groove 12 so that the target assembly 2 can easily slide into the position of the beam shaper 1. The 0 mark of the adjustment scale is provided on one side of the slide groove 12 facing the outside of the beam shaper 1. In order to accurately control and easily adjust the position of the target assembly 2 inside the beam shaper 1 and to meet different treatment needs, the current generated in the target body can be extracted and monitored.

[0043] The slide groove 12 is located at one end of the cylinder 6 close to the target vacuum tube segment 62. The slide groove 12 has a part of the axial length, and the specific length of the slide groove 12 needs to meet the adjustment range of the cylinder 6 entering the beam shaper 1, so that the current from the accelerator to the cylinder 6 can be effectively drawn according to different treatment needs and real-time monitoring can be realized.

[0044] As shown in Fig. 10, the slide groove 12 may be a groove formed integrally with the cylindrical body 6, or as shown in Fig. 7, the slide groove 12 may be installed on the cylindrical body 6 in an external slide rail mode. For example, this may be achieved by fixing and connecting a slide base 13 with a slide groove to the cylindrical body 6. The slide groove 12 and the cylindrical body 6 are insulated from each other.

[0045] Of course, as shown in Fig. 11, one or more slide grooves 12 may be provided. When multiple slide grooves 12 are provided, the slide grooves 12 may be distributed uniformly along the circumferential direction of the cylindrical body 6, concentrated on one side, distributed on both sides, or irregularly distributed.

[0046] 12, in another embodiment, the sliding groove 12 may have a fan-shaped structure, that is, the sliding groove 12 is arranged in a fan shape on the outer circumference of the cylindrical body 6. In this case, the sliding groove 12 may be directly opened on the cylindrical body 6, or may be connected to the cylindrical body 6 by a fan shape with the sliding groove 12.

[0047] The cross-sectional shape of the slide groove 12 may be various shapes such as a T-shape or a dovetail shape.

[0048] The slide positioning member 101 is slidably installed in the slide groove 12 and is insulated from the slide groove 12. In this embodiment, the slide positioning member 101 is a slide positioning block.

[0049] The slide positioning member 101 is installed by fitting based on the number and position structure of the slide grooves, and includes a slide body 104 and a contact body 105 that fit into the slide grooves. The contact body 105 may have different shapes such as a sheet shape, a ring shape, or a point shape. The slide body 104 may have different shapes such as a T shape or a dovetail shape. The slide positioning member 101 is protruded from the cylinder 6 along the radial direction of the cylinder 6, and when the cylinder 6 moves into the beam shaper BSA proton channel 4, the slide positioning member 101 is always outside the beam shaper 1.

[0050] The contact movable member 102 is installed by fitting into the contact body 105, and since the contact movable member 102 is used to realize on / off, the contact movable member 102 may be provided in a protruding position on the contact body 105 or in a recessed position within the contact body 105, and may be in a mother-to-son contact with the contact conductive assembly 11 or in a pressure contact. In other words, any method that can realize contact passage and non-contact cutoff may be adopted.

[0051] The contact movable member 102 and the conductive path 103 of the target body 7 may be connected by a direct electric wire or a conductive metal wire. The conductive path 103 may be of an extendable type or a fixed type with a certain tensile length.

[0052] The contact conductive assembly 11 includes an insulating gasket 111 that is insulated and connected to the outside of the beam shaper 1, and a contact fixing member 112, and in this embodiment, the contact fixing member 112 forms the fixed contact 31. The contact fixing member 112 is fitted into and installed on the contact movable member 102. The contact fixing member 112 may be one or more, and may be in the shape of a sheet, a point, or a ring, and may have a divided structure or an integrated structure.

[0053] The fixed contact member 112 makes contact with the movable contact member 102 to conduct the path, and does not make contact to break the path. That is, the movable contact 21 makes contact with the fixed contact 31 to conduct the path, and does not make contact to break the path.

[0054] The fixed contact member 112 is connected to the monitoring display device 8 by a connecting lead wire 9, and the fixed contact member 112 may be fixedly connected to the connecting lead wire or may be connected in a loose contact manner. As a preferred aspect, in this embodiment, the fixed contact member 112 is fixedly connected to the connecting lead wire by welding. The movable contact member 102 may adopt various different shapes such as a metal contact, a metal sheet, or a metal probe, and the fixed contact member 112 may adopt various different shapes such as a metal pressing piece or a metal probe. In this embodiment, the movable contact member 102 may adopt a metal contact, and the fixed contact member 112 adopts a metal sheet.

[0055] In order to reduce radiation leakage as much as possible, a relatively small slide gap is adopted as much as possible, provided that the beam shaper BSA proton channel 4 fills the slide of the target assembly 2 and does not affect the passage of the variable positioning on / off assembly 10.

[0056] When in use, the variable positioning on / off assembly 10 moves along the beam shaper BSA proton channel 4 together with the target assembly 2, and the slide positioning member 101 in the variable positioning on / off assembly 10 is protruded from the cylinder 6 along the radial direction of the cylinder, so that the slide positioning member 101 is always positioned outside the beam shaper 1 while the target assembly 2 is moving, and when the slide positioning member 101 moves into the beam shaper 1 on the cylinder 6, the slide positioning member 101 moves outward relative to the slide groove 12, and when the slide positioning member 101 contacts the contact fixing member 112 in the contact conductive assembly 11 outside the beam shaper 1 to form a passage (see Figure 7), the current of the target assembly 2 can be introduced in real time to a reading device such as an ammeter.

[0057] In the above embodiment, the core of the technical solution for the boron neutron capture therapy system is to solve the problem that the hard connection of the wires between the target body and the current monitoring device (milliampere ammeter, oscillograph, etc.) causes tension between the wires and the current monitoring device during the target replacement process, so it is necessary to artificially disconnect the target and the current monitoring device in a radiation environment, which creates a radiation risk.In addition, since the position of the target in the beam shaper 1 moves as needed, hard connection of the wires and the current monitoring device is disadvantageous to the target movement.Therefore, by installing contact-type passage means 5, which is a contact passage and non-contact interruption, in the current path, it is possible to avoid impact on the current monitoring device during the target replacement process.

[0058] A slide positioning member 101, which is insulated from the cylinder 6 and can be moved to an adjustable position along the axial direction, is disposed on the cylinder 6. The function of the slide positioning member 101 is to position the target between the outer surfaces of the beam shaper 1 in a mechanical position limiting manner, and after adjusting the beam conditions, the position of the slide positioning member 101 can be selected, and in this case, the position of the target assembly 2 inside the beam shaper 1 can be determined.

[0059] The slide positioning member 101 slightly spans the outer contour edge of the beam shaper BSA proton channel, and the contact movable member 102 or movable contact 21 on the slide positioning member 101 can contact the contact fixed member 112 or fixed contact 31 installed on the outer contour edge of the beam shaper BSA proton channel to achieve electrical conductivity.

[0060] The target body 7 is in contact with the contact movable member 102 on the slide positioning member 101 by an electric wire or a lead wire. A contact conductive assembly 11 is arranged on the outer contour edge of the beam shaper BSA proton channel 4 and is insulated from the beam shaper.

[0061] When the target reaches a predetermined position, the movable contact member 102 of the slide positioning member 101 is electrically connected to the external fixed contact member 112. The fixed contact member 112 externally connects to an ammeter via an electric wire, ultimately realizing that the electricity of the target is introduced into the ammeter.

[0062] When a new target assembly 2 is introduced into the BSA, the position of the target assembly 2 within the beam shaper 1 can be adjusted simply by adjusting the position of the slide positioning member 101, which limits the position of the target assembly 2 and also electrically connects it to the contact fixing member 112 via the contact movable member 102 on the slide positioning member 101. This avoids the need to affect equipment or manually disconnect lines when replacing the target assembly 2, which could pose a radiation risk.

[0063] The position of the target assembly 2 inside the beam shaper 1 is adjusted according to treatment requirements, so that the current from the accelerator to the target assembly 2 can be drawn by an ammeter regardless of the treatment requirements. Therefore, the slide positioning member 101 has a certain sliding space in the cylinder 6 to accommodate different positions at which the target assembly enters the beam shaper. In this way, when replacing the target assembly 2, the electric wire or lead wire between the cylinder 6 and the slide positioning member 101 is short and is installed integrally with the cylinder 6, so that they can be stored together in a waste target box, and the current reading device is only connected to the contact fixing member 112 outside the beam shaper, so that the reading device is not entangled and does not impose an additional burden on the storage of the target assembly.

[0064] The slide positioning member 101 also needs to be fabricated so that it is insulated from other components such as the slide positioning member 101 even if the target assembly contacts the contact movable member 102 on the slide positioning member 101 via an electric wire.

[0065] The target body 7 must be insulated from the tip and does not come into contact with the beam shaper, i.e. the target body is insulated everywhere.

[0066] The specific operation of the boron neutron capture therapy system is as follows: First, the slide positioning member 101 on the target assembly is adjusted, and the position of the slide positioning member 101 on the cylinder 6 is adjusted based on the position at which the target assembly enters the beam shaping body. When the target assembly enters the beam shaping body to the set position and is positioned, the contact movable member 102 or the movable contact 21 on the slide positioning member 101 comes into contact with the contact fixed member 112 or the fixed contact 31, and a conductive circuit is formed between the monitoring equipment and the target assembly, thereby achieving conductivity.

[0067] Next, the contact fixing member 112 is connected to an external ammeter by an electric wire, and when the target comes into contact with the pressure piece or probe, a path is formed between the target body, the contact movable member 102 or movable contact 21 on the slide positioning member 101, the contact fixing member 112 or fixed contact 31, and the ammeter.

[0068] Third, when replacing the target assembly, the target assembly is extracted from the inside of the beam shaping body by the robot arm, and the contact between the contact movable member 102 or the movable contact 21 on the slide positioning member 101 on the cylinder 6 and the contact fixed member 112 or the fixed contact 31 is released, thereby forming a disconnection between the target assembly and the ammeter, and in this case the target assembly can be normally automatically replaced and accommodated.

[0069] The boron neutron capture therapy system realizes target current measurement under the premise of fully automatic target replacement, solving the problem of increased operation costs caused by manually disconnecting the wire connecting the ammeter and target at the radiation site or storing the target and ammeter together.

[0070] The contact movable member 102 on the slide positioning member 101 and the contact fixed member 112 on the outside of the beam shaper enable contact-type current monitoring, which does not affect the target housing when replacing the target. In addition, the electric wire can be extended, and the ammeter can be placed in a non-radiative area, which improves the service life of the equipment.

[0071] The current measurement method of this embodiment makes it possible to avoid the current extraction device from affecting the beam inside the proton channel to some extent, and all components are located outside the beam shaper.

[0072] The sliding positioning member 101, the movable contact member 102 and the fixed contact member 112 in the boron neutron capture therapy system may be made of metal contacts, metal sheets, or other conductive materials. The shapes may be any other shapes and are not limited to the shapes shown in the diagram, as long as the purpose is still to draw current from the target body.

[0073] The metal contacts can be of other shapes, such as metal spring contacts, to achieve electrical conductivity while avoiding hard contact between the target positioning block and the outside of the beam shaper and increasing the contact area. The metal sheet can also be of multiple shapes to increase the contact probability between the metal contacts and the metal sheet.

[0074] The above-mentioned specific embodiments are specific specific embodiments of the present invention, and are intended to explain the concept of the present invention. They are all explanatory and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art may adopt obvious other technical solutions based on the claims and the contents disclosed in the specification, and these technical solutions include any obvious substitutions and modifications to the embodiments described herein, all of which fall within the protection scope of the present invention.

[0075] (Addendum) (Appendix 1) A boron neutron capture therapy system including a beam shaper (1) with a proton channel (4) and a replaceable target assembly (2) installed inside the proton channel (4), A current monitoring device (3) is installed outside the beam shaper (1), a movable contact (21) is installed on the target assembly, and a fixed contact (31) is installed on the current monitoring device, which forms a moving contact conduction mode with the movable contact (21). A boron neutron capture therapy system characterized by:

[0076] (Appendix 2) The movable contact (21) and the fixed contact (31) are installed in a contact passage device (5) that realizes a moving contact conduction mode. 2. A boron neutron capture therapy system according to claim 1,

[0077] (Appendix 3) The contact passage device (5) includes a variable positioning on / off assembly (10) slidably mounted on the target assembly (2) and a contact conducting assembly (11) mounted on the exterior of the beam shaper (1). 3. A boron neutron capture therapy system according to claim 2,

[0078] (Appendix 4) When the movable contact (21) is installed in a variable positioning on-off assembly (10) and the fixed contact (31) is installed in a contact conducting assembly (11), and the variable positioning on-off assembly (10) and the contact conducting assembly (11) are in contact and conducting, a current monitoring path is formed between the target assembly (2), the variable positioning on-off assembly (10), the contact conducting assembly (11), and the current monitoring device (3). 4. A boron neutron capture therapy system according to claim 3,

[0079] (Appendix 5) The variable positioning on-off assembly (10) includes an insulating slide positioning member (101), a contact movable member (102) fixedly attached to the slide positioning member (101), and the contact movable member (102) is electrically connected to the target assembly (2) by a conductive path (103). 4. A boron neutron capture therapy system according to claim 3,

[0080] (Appendix 6) The movable contact (21) is mounted on a contact movable member (102), or the contact movable member (102) forms the movable contact; 6. A boron neutron capture therapy system according to claim 5,

[0081] (Appendix 7) A slide groove (12) is installed in the target assembly (2), and the slide positioning member (101) is slidably installed inside the slide groove (12) and is located outside the beam shaping body (1). 6. A boron neutron capture therapy system according to claim 5,

[0082] (Appendix 8) The contact conducting assembly (11) includes a contact fixing member (112) located outside the beam shaper (1) and at the outer edge of the proton channel; The contact fixing member (112) is electrically connected to a current monitoring device (3). 4. A boron neutron capture therapy system according to claim 3,

[0083] (Appendix 9) The fixed contact (31) is mounted on a contact fixing member (112), or the contact fixing member (112) forms the fixed contact (31); 9. A boron neutron capture therapy system according to claim 8,

[0084] (Appendix 10) The contact fixing member (112) is fixed to the outside of the beam shaping body (1), or the contact fixing member (112) is movably installed on the beam shaping body (1); 9. A boron neutron capture therapy system according to claim 8,

[0085] (Appendix 11) The target assembly (2) includes a cylindrical body (6) and a target body (7), and the target body (7) is installed at one end of the cylindrical body (6) that projects into the interior of the beam shaper (1), and the target body (7), the contact-type passage device (5), and the current monitoring device (3) form a passage. 11. A boron neutron capture therapy system according to any one of appendices 2 to 10, wherein:

[0086] (Appendix 12) The current monitoring device (3) includes an external monitoring and display device (8); 11. A boron neutron capture therapy system according to any one of appendices 1 to 10, wherein:

[0087] (Appendix 13) The target assembly (2) is provided with a scale for realizing position adjustment. 11. A boron neutron capture therapy system according to any one of appendices 1 to 10, wherein: [Explanation of symbols]

[0088] 1 Beam shaper 2. Target Assembly 21 moving contacts, 3 Current monitoring equipment 31 Fixed contacts, 4. Proton Channel 5 Contact passage device 6 Cylinder 62 target tube segments 7 Target body 8 Monitoring display device 9 Connecting lead wire 10 Variable Positioning On-Off Assembly 101 slide positioning member 102 Contact movable member 103 Conductive Path 104 Slide body 105 Contact body 11 Contact conducting assembly 111 Insulating gasket 112 Contact fixing member 12 Slide groove 13 Slide Base

Claims

1. A boron neutron capture therapy system including a beam shaper (1) with a proton channel (4) and a replaceable target assembly (2) installed inside the proton channel (4), A current monitoring device (3) is installed outside the beam shaper (1), a movable contact (21) is installed on the target assembly, and a fixed contact (31) is installed on the current monitoring device to form a moving contact conduction mode with the movable contact (21). A boron neutron capture therapy system characterized by:

2. The movable contact (21) and the fixed contact (31) are installed in a contact passage device (5) that realizes a moving contact conduction mode.

2. The boron neutron capture therapy system according to claim 1.

3. The contact passage device (5) includes a variable positioning on-off assembly (10) slidably mounted on the target assembly (2), and a contact conducting assembly (11) mounted on the exterior of the beam shaper (1).

3. The boron neutron capture therapy system according to claim 2.

4. When the movable contact (21) is installed in a variable positioning on-off assembly (10) and the fixed contact (31) is installed in a contact conducting assembly (11), and the variable positioning on-off assembly (10) and the contact conducting assembly (11) are in contact and conducting, a current monitoring path is formed between the target assembly (2), the variable positioning on-off assembly (10), the contact conducting assembly (11), and the current monitoring device (3).

4. The boron neutron capture therapy system according to claim 3.

5. The variable positioning on-off assembly (10) includes an insulating slide positioning member (101), a contact movable member (102) fixed to the slide positioning member (101), and the contact movable member (102) is electrically connected to the target assembly (2) by a conductive path (103).

4. The boron neutron capture therapy system according to claim 3.

6. The movable contact (21) is mounted on a contact movable member (102), or the contact movable member (102) forms the movable contact; 6. The boron neutron capture therapy system according to claim 5.

7. A slide groove (12) is installed in the target assembly (2), and the slide positioning member (101) is slidably installed inside the slide groove (12) and is located outside the beam shaper (1).

6. The boron neutron capture therapy system according to claim 5.

8. The contact conducting assembly (11) includes a contact fixing member (112) located outside the beam shaper (1) and at the outer edge of the proton channel; The contact fixing member (112) is electrically connected to a current monitoring device (3); 4. The boron neutron capture therapy system according to claim 3.

9. The fixed contact (31) is mounted on a contact fixing member (112), or the contact fixing member (112) forms the fixed contact (31); 9. The boron neutron capture therapy system according to claim 8.

10. The contact fixing member (112) is fixed to the outside of the beam shaping body (1), or the contact fixing member (112) is movably installed on the beam shaping body (1); 9. The boron neutron capture therapy system according to claim 8.

11. The target assembly (2) includes a cylinder (6) and a target body (7), the target body (7) is installed at one end of the cylinder (6) that projects into the interior of the beam shaper (1), and the target body (7), the contact-type passage device (5), and the current monitoring device (3) form a passage.

11. The boron neutron capture therapy system according to claim 2, wherein the boron neutron capture therapy system comprises:

12. The current monitoring device (3) includes an external monitoring and display device (8).

11. The boron neutron capture therapy system according to claim 1.

13. The target assembly (2) is provided with a scale for realizing position adjustment.

11. The boron neutron capture therapy system according to claim 1.

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