A multi-functional dose measuring device for an intraoperative radiotherapy apparatus

Abstract

The application discloses a multifunctional dose measuring device for an intraoperative radiotherapy equipment, and belongs to the technical field of measuring equipment, which comprises a support adjusting module, a energy spectrum measuring module and an air kerma measuring module; the support adjusting module comprises a support base, the bottom of the support base is provided with an adjusting support, the surface of the support base is installed with a vertical positioning mechanism, the vertical positioning mechanism is installed with a triangular plate which can slide along the height direction of the vertical positioning mechanism, the side surface of the vertical positioning mechanism is installed with a scale, and the support base is installed with a three-dimensional positioning mechanism. The energy spectrum measuring module and the air kerma measuring module are both installed on the support adjusting module, the module dismounting and switching process does not need to reposition the reference surface, the steps of repeated positioning and adjustment are reduced, the switching efficiency between the modules can be obviously improved, and the function of measuring dose parameters in an integrated structure is realized.

Description

Technical Field

[0001] This invention belongs to the field of measurement equipment technology, and specifically relates to a multifunctional dose measurement device for intraoperative radiotherapy equipment. Background Technology

[0002] Intraoperative radiotherapy (IRT) is an important method in tumor treatment, involving the direct application of radiation to the tumor area during surgery. It boasts high precision, efficiency, and immediacy, achieving a breakthrough in local control by combining the advantages of surgery and radiotherapy. A crucial step before intraoperative treatment is dose control of the emitted beam. To achieve dose control measurements, research is needed on the control equipment and methods, with key parameters including the air kerma of the radiation and the energy spectrum of the beam.

[0003] Air kerma represents the energy deposited by radiation per unit mass of air; it is one of the fundamental physical quantities in the field of ionizing radiation and has significant physical importance. The energy spectrum represents the particle distribution characteristics of radiation at different energy levels and is the basis for measuring other physical quantities.

[0004] Currently, there is no structure for simultaneously measuring air kerma and energy spectrum of intraoperative radiotherapy equipment. Usually, two separate devices are used to measure the air kerma and energy spectrum of intraoperative radiotherapy equipment.

[0005] Measuring air kerma requires three-dimensional adjustment of both the intraoperative radiotherapy equipment and the air kerma measuring instrument to ensure that the radiation emitted by the radiotherapy equipment is coaxial with the instrument. The radiotherapy equipment is designed with a fixed structure, while the air kerma measuring instrument requires a three-dimensionally movable structure. This, combined with three-directional positioning lasers, involves continuously adjusting the air kerma measuring instrument in three directions, making the process complex. Furthermore, the designed structure not only needs to fix the radiotherapy equipment but also requires a beam-limiting device at the radiation beam exit point.

[0006] During the measurement of the energy spectrum, positioning devices need to be designed for both the energy spectrum measuring instrument and the intraoperative radiotherapy equipment. Similarly, positioning devices and three-dimensional movement devices need to be designed separately for the intraoperative radiotherapy equipment and the energy spectrum measuring instrument. A beam-limiting aperture needs to be designed for the energy spectrum measuring instrument during the measurement process. The aperture acts as a beam limiter, reducing the photon fluence entering the energy spectrum measuring instrument, lowering the count rate, reducing the dead time of the energy spectrum measuring instrument, and facilitating energy spectrum measurement.

[0007] The above measurement structures need to be designed individually according to different measurement requirements. Not only are there many measurement structures designed, but they are also scattered, making it impossible to measure multiple dose parameters at the same time. This results in high costs and low measurement efficiency. Summary of the Invention

[0008] The purpose of this invention is to provide a multifunctional dose measurement device for intraoperative radiotherapy equipment, which solves the problems of low measurement efficiency and complex debugging process of existing equipment when measuring the energy spectrum and air kerma of intraoperative radiotherapy equipment.

[0009] The technical solution adopted in this invention is as follows:

[0010] A multifunctional dose measurement device for intraoperative radiotherapy equipment includes a support adjustment module, an energy spectrum measurement module, and an air kerma measurement module;

[0011] The support adjustment module includes a support base, an adjustment bracket at the bottom of the support base, a vertical positioning mechanism on the surface of the support base, a triangular plate that can slide along the height direction of the vertical positioning mechanism on the vertical positioning mechanism, a scale on the side of the vertical positioning mechanism, and a three-dimensional positioning mechanism on the support base.

[0012] The energy spectrum measurement module includes a first back plate mounted on the upper surface of a triangular plate, an X-ray source positioning mechanism mounted on the first back plate, an adjustment frame movable along the height direction of the X-ray source positioning mechanism mounted on the X-ray source positioning mechanism, a first optical bayonet mounted on the adjustment frame, a first X-ray source mounted on the upper surface of the first optical bayonet, a first spherical applicator mounted on the lower surface of the first optical bayonet, a first right-angle plate mounted on the lower surface of the triangular plate, a first support component vertically connected to the first right-angle plate, an plexiglass container mounted on the first support component, the end of the first spherical applicator extending into the plexiglass container, the plexiglass container filled with deionized water, a second right-angle plate mounted on the three-dimensional positioning mechanism, a detector bracket mounted on the surface of the second right-angle plate, an energy spectrum measurement detector mounted on the detector bracket, a second support component mounted on the support base next to the three-dimensional positioning mechanism, a beam-limiting aperture mounted on the second support component, and the beam-limiting aperture of the beam-limiting aperture, the entrance window of the energy spectrum measurement detector, and the optical tube of the first X-ray source coaxially.

[0013] The air kerma measurement module includes an ionization chamber bracket mounted on the upper surface of a triangular plate, which is used to fix the ionization chamber. A second back plate is mounted on the lower surface of the triangular plate, and a connecting bracket is vertically connected to the second back plate. A vertical collimation shielding structure is provided on the upper surface of the connecting bracket. An X-ray source fixing assembly is mounted on the three-dimensional positioning mechanism. A second X-ray source is mounted on the X-ray source fixing assembly. A second optical bayonet is mounted on the top of the second X-ray source. A second spherical applicator is mounted on the upper surface of the second optical bayonet. The light tube of the second X-ray source, the vertical collimation shielding structure, and the entrance window of the ionization chamber are coaxial.

[0014] Both the energy spectrum measurement module and the air kerma measurement module are mounted on the support and adjustment module, which can significantly improve the switching efficiency between modules.

[0015] Furthermore, the X-ray source fixing component is a PEEK block, and the bottom of the PEEK block is bolted to the three-dimensional positioning mechanism.

[0016] Furthermore, the plexiglass container is a polymethyl methacrylate cylinder with an opening.

[0017] Furthermore, the detector bracket is made of polymethyl methacrylate.

[0018] Furthermore, the first back plate and the second back plate are provided with a first interface group for connecting the X-ray source positioning mechanism and a second interface group for connecting the connecting bracket.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. In this invention, both the energy spectrum measurement module and the air kerma measurement module are mounted on the support adjustment module, which significantly improves the switching efficiency between modules and enables the integrated structure to measure dose parameters. Addressing the problem of excessively long reconfiguration times in traditional measurement systems, this invention uses a shared reference plane on the support base for both the energy spectrum measurement module and the air kerma measurement module. This eliminates the need to reposition the reference plane during module disassembly and switching, reducing repetitive positioning and adjustment steps. The backplate is designed for dual purposes: connecting the X-ray source positioning mechanism in the energy spectrum measurement module and connecting the connecting bracket in the air kerma measurement module. Pre-set first and second interface groups ensure error-proof and foolproof installation of the components, improving installation efficiency. The overall solution employs a modular design, significantly enhancing installation efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the energy spectrum measurement module of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the air kerma measurement module of the present invention.

[0024] The diagram is labeled as follows: 1-X-X-ray source positioning mechanism, 2-Vertical positioning mechanism, 3-First X-ray source, 4-First spherical applicator, 5-Plexiglass container, 6-First optical bayonet, 7-First back plate, 8-Triangle plate, 9-First right-angle plate, 10-Beam limiting aperture, 11-Detector bracket, 12-Three-dimensional positioning mechanism, 13-First support component, 14-Second support component, 15-Second right-angle plate, 16-Support base, 17-Adjustment bracket, 18-Scale, 19-Plumb line shielding structure, 20-Connecting bracket, 21-X-ray source fixing component, 22-Ionization chamber bracket, 23-Second back plate, 24-Second X-ray source, 25-Second optical bayonet, 26-Second spherical applicator. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that the labels and letters in the following figures represent similar items, therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only used for the purpose of simplifying the description of this invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Refer to the instruction manual. Figure 1-2 ,

[0032] A multifunctional dose measurement device for intraoperative radiotherapy equipment includes a support adjustment module, an energy spectrum measurement module, and an air kerma measurement module;

[0033] The support adjustment module includes a support base, an adjustment bracket at the bottom of the support base, a vertical positioning mechanism on the surface of the support base, a triangular plate that can slide along the height direction of the vertical positioning mechanism on the vertical positioning mechanism, a scale on the side of the vertical positioning mechanism, and a three-dimensional positioning mechanism on the support base.

[0034] The energy spectrum measurement module includes a first back plate mounted on the upper surface of a triangular plate, an X-ray source positioning mechanism mounted on the first back plate, an adjustment frame movable along the height direction of the X-ray source positioning mechanism mounted on the X-ray source positioning mechanism, a first optical bayonet mounted on the adjustment frame, a first X-ray source mounted on the upper surface of the first optical bayonet, a first spherical applicator mounted on the lower surface of the first optical bayonet, a first right-angle plate mounted on the lower surface of the triangular plate, a first support component vertically connected to the first right-angle plate, an plexiglass container mounted on the first support component, the end of the first spherical applicator extending into the plexiglass container, the plexiglass container filled with deionized water, a second right-angle plate mounted on the three-dimensional positioning mechanism, a detector bracket mounted on the surface of the second right-angle plate, an energy spectrum measurement detector mounted on the detector bracket, a second support component mounted on the support base next to the three-dimensional positioning mechanism, a beam-limiting aperture mounted on the second support component, and the beam-limiting aperture of the beam-limiting aperture, the entrance window of the energy spectrum measurement detector, and the optical tube of the first X-ray source coaxially.

[0035] The air kerma measurement module includes an ionization chamber bracket mounted on the upper surface of a triangular plate, which is used to fix the ionization chamber. A second back plate is mounted on the lower surface of the triangular plate, and a connecting bracket is vertically connected to the second back plate. A vertical collimation shielding structure is provided on the upper surface of the connecting bracket. An X-ray source fixing assembly is mounted on the three-dimensional positioning mechanism. A second X-ray source is mounted on the X-ray source fixing assembly. A second optical bayonet is mounted on the top of the second X-ray source. A second spherical applicator is mounted on the upper surface of the second optical bayonet. The light tube of the second X-ray source, the vertical collimation shielding structure, and the entrance window of the ionization chamber are coaxial.

[0036] Both the energy spectrum measurement module and the air kerma measurement module are mounted on the support and adjustment module, which can significantly improve the switching efficiency between modules.

[0037] Specifically, the X-ray source is manufactured by Zeiss and is used as an intraoperative radiotherapy source. The gold target hemispherical shell structure generates isotropic 50kV X-rays, which are used by connecting a spherical applicator through an optical bayonet.

[0038] Specifically, the X-ray source positioning mechanism consists of a 150×100mm lead screw slide and a stepper motor-driven harmonic reducer to achieve micron-level repeatability positioning accuracy.

[0039] Specifically, the X-ray source fixing assembly is a 30×30×20mm PEEK block with a slotting tolerance of +0.1 / -0mm, and is installed to the three-dimensional positioning mechanism at the bottom via 4×M4 bolts.

[0040] Specifically, the acrylic container is a polymethyl methacrylate cylinder (Φ100×150mm) with a wall thickness of 5mm, an open bottom at one end, and coaxially assembled with a beam-limiting aperture (positional tolerance ≤0.1mm).

[0041] Specifically, the back plate surface is divided into upper row of Φ8.5mm through holes and lower row of M6 threaded holes, which are respectively used for the installation of the X-ray source positioning mechanism of the energy spectrum module and the connecting bracket of the air kerma module.

[0042] Specifically, the lead collimation shielding structure is as follows: a lead cylinder with an outer diameter of Φ102mm, a spiral guide groove with a depth of 2mm and a pitch of 15mm machined in the inner cavity, a through hole of Φ10±0.1mm at the top to fit the X-ray source tube, and a lead layer with a thickness of 10.2mm on the side wall.

[0043] Specifically, the detector bracket is made of polymethyl methacrylate and consists of a rectangular base plate and two rectangular frames, which are fixed to the second right-angle plate by 4×M5 bolts.

[0044] Specifically, the ionization chamber support is a polymethyl methacrylate U-shaped groove (width 25+0.1 / -0mm, length 100mm) with a movable ionization chamber at a depth within the groove.

[0045] Specifically, the vertical positioning mechanism is: a Φ8mm lead screw slide structure (1mm lead) with a vernier scale, manual rotation torque ≤2N•m, and distance control accuracy ±0.1mm within a stroke of 200mm.

[0046] In this embodiment, the energy spectrum measurement module is installed as follows:

[0047] First, the support base is leveled using four sets of adjusting brackets (horizontal error ≤ 0.1°). The back plate and tripod are assembled into an L-shaped structure using 4×M6 bolts, and the X-ray source positioning mechanism is fixed to the front of the back plate with 4×M6 bolts. An acrylic container is placed on top of the first support assembly and fixed as a whole to the first right-angle plate, which is also fixed below the tripod. Then, the X-ray source, 4cm spherical applicator, and optical bayonet are installed accordingly. After the beam-limiting aperture is pressed into the center hole of the second support assembly, the position of the detector bracket is finely adjusted using the three-dimensional positioning mechanism until the laser collimator (external auxiliary tool) confirms that the X-ray source tube, beam-limiting aperture, and detector entrance window are coaxial (deviation ≤ 0.5mm).

[0048] Air kerma measurement mode installation:

[0049] When disassembling the energy dispersive spectroscopy module, first drain the deionized water from the plexiglass container, unscrew the 4×M5 bolts on the detector bracket, loosen the optical bayonet set screws, and then pull out the X-ray source and spherical applicator. When installing the air kerma module, fix the lead collimation shielding structure to the connecting bracket with 4×M4 bolts, and then fix the entire assembly to the back plate with M6 bolts. Insert the ionization chamber bracket into the positioning pin on the upper surface of the tripod. Install the X-ray source fixing assembly on the upper surface of the three-dimensional positioning mechanism, insert the X-ray source, and then tighten the set screws. Adjust the position of the lead collimation shielding structure, and then install the optical bayonet and spherical applicator in sequence. Then insert the ionization chamber into the ionization chamber bracket and tighten the lateral set screws. Finally, use a laser collimator (external auxiliary tool) to confirm that the X-ray source tube, lead collimation shielding structure, and ionization chamber entrance window are coaxial (deviation ≤0.5mm).

[0050] The above description constitutes an embodiment of the present invention. The foregoing descriptions are preferred embodiments of the present invention. Unless there is a clear contradiction or a prerequisite for a particular preferred embodiment, the preferred embodiments can be arbitrarily combined and used. The embodiments and specific parameters described are merely for clearly illustrating the verification process of the invention and are not intended to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention is still determined by its claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention should also be included within the scope of protection of the present invention.

Claims

1. A multi-functional dosimeter for an intraoperative radiotherapy device, comprising: This includes a support and adjustment module, an energy spectrum measurement module, and an air kerma measurement module; The support adjustment module includes a support base (16), an adjustment bracket (17) is provided at the bottom of the support base (16), a vertical positioning mechanism (2) is installed on the surface of the support base (16), a triangular plate (8) that can slide along the height direction of the vertical positioning mechanism (2) is installed on the vertical positioning mechanism (2), a scale (18) is installed on the side of the vertical positioning mechanism (2), and a three-dimensional positioning mechanism (12) is installed on the support base (16). The energy spectrum measurement module includes a first back plate (7) mounted on the upper surface of a triangular plate (8), an X-ray source positioning mechanism (1) mounted on the first back plate (7), an adjustment frame that can move along the height direction of the X-ray source positioning mechanism (1) mounted on the X-ray source positioning mechanism (1), a first optical bayonet (6) mounted on the adjustment frame, a first X-ray source (3) mounted on the upper surface of the first optical bayonet (6), a first spherical applicator (4) mounted on the lower surface of the first optical bayonet (6), a first right-angle plate (9) mounted on the lower surface of the triangular plate (8), a first bearing assembly (13) vertically connected to the first right-angle plate (9), and a first bearing assembly (13) mounted on the first bearing assembly (13). The first spherical applicator (4) extends into the organic glass container (5), which is filled with deionized water. A second right-angle plate (15) is installed on the three-dimensional positioning mechanism (12), and a detector bracket (11) is installed on the surface of the second right-angle plate (15). An energy spectrum measurement detector is installed on the detector bracket (11). A second bearing component (14) is installed on the support base (16) next to the three-dimensional positioning mechanism (12). A beam-limiting aperture (10) is installed on the second bearing component (14). The beam-limiting aperture of the beam-limiting aperture (10), the entrance window of the energy spectrum measurement detector, and the optical tube of the first X-ray source (3) are coaxial. The air kerma measurement module includes an ionization chamber bracket (22) mounted on the upper surface of a triangular plate (8), the ionization chamber bracket (22) being used to fix the ionization chamber, a second back plate (23) mounted on the lower surface of the triangular plate (8), a connecting bracket (20) vertically connected to the second back plate (23), a vertical collimation shielding structure (19) provided on the upper surface of the connecting bracket (20), an X-ray source fixing assembly (21) mounted on the three-dimensional positioning mechanism (12), a second X-ray source (24) mounted on the X-ray source fixing assembly (21), a second optical bayonet (25) mounted on the top of the second X-ray source (24), a second spherical applicator (26) mounted on the upper surface of the second optical bayonet (25), and the light tube, the vertical collimation shielding structure (19), and the entrance window of the ionization chamber of the second X-ray source (24) being coaxial. Both the energy spectrum measurement module and the air kerma measurement module are mounted on the support and adjustment module, which can significantly improve the switching efficiency between modules.

2. A multi-functional dosimeter for an intraoperative radiotherapy device according to claim 1, characterized in that, The X-ray source fixing component (21) is a PEEK block, and the bottom of the PEEK block is bolted to the three-dimensional positioning mechanism (12).

3. A multi-functional dosimeter for an intraoperative radiotherapy device as defined in claim 1, wherein The plexiglass container (5) is a polymethyl methacrylate cylinder with an opening.

4. The multi-functional dosimeter for use in an intraoperative radiotherapy apparatus according to claim 1, wherein The detector bracket (11) is made of polymethyl methacrylate.

5. The multi-functional dosimeter for use in an intraoperative radiotherapy apparatus according to claim 1, wherein The first back plate (7) and the second back plate (23) are provided with a first interface group for connecting the X-ray source positioning mechanism (1) and a second interface group for connecting the connecting bracket (20).

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