Multifunctional dose measuring device for intraoperative radiotherapy equipment

Abstract

The invention discloses a multifunctional dose measurement device for intraoperative radiotherapy equipment, which belongs to the technical field of measurement equipment and comprises a support adjustment module, an energy spectrum measurement module and an air kerma measurement module. The supporting adjusting module comprises a supporting base, an adjusting support is arranged at the bottom of the supporting base, a vertical positioning mechanism is installed on the surface of the supporting base, a triangular plate capable of sliding in the height direction of the vertical positioning mechanism is installed on the vertical positioning mechanism, and a graduated scale is installed on the side face of the vertical positioning mechanism. And a three-dimensional positioning mechanism is mounted on the supporting base. According to the device, the energy spectrum measurement module and the air kerma measurement module are both installed on the supporting and adjusting module, a datum plane does not need to be repositioned in the module disassembling and switching process, the step of repeated positioning and adjusting is reduced, the switching efficiency between the modules can be remarkably improved, and the function of measuring dose parameters through an integrated structure is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of measuring equipment, and particularly relates to a multifunctional dose measuring device for an intraoperative radiotherapy device. BACKGROUND

[0002] Intraoperative radiotherapy technology is an important method for tumor treatment, and is a technology for directly performing radiotherapy on a tumor region during surgery. The intraoperative radiotherapy technology has high accuracy, high efficiency and instantaneity, and realizes a breakthrough in local control by combining the advantages of surgery and radiotherapy. Before intraoperative treatment, an important step is to perform quality control on the dose of the beam line emitted by the device. In order to realize dose quality control measurement, it is necessary to research the quality control device and the quality control method, and an important parameter is the air kerma of the rays and the energy spectrum measurement of the beam line.

[0003] The air kerma represents the energy deposited by rays in unit mass of air, and is one of the basic physical quantities in the field of ionizing radiation, and has important physical significance. The energy spectrum represents the particle distribution characteristics of different energy sections of rays, and is the basis for measuring other physical quantities.

[0004] At present, there is no structure for simultaneously measuring the air kerma and the energy spectrum of the intraoperative radiotherapy device. The air kerma and the energy spectrum of the intraoperative radiotherapy device are usually measured by two sets of devices respectively.

[0005] During the measurement of the air kerma, the intraoperative radiotherapy device and the instrument for measuring the air kerma need to be adjusted in three-dimensional directions to keep the rays emitted by the intraoperative radiotherapy device coaxial with the instrument for measuring the air kerma. The structure of the fixed device is designed for the intraoperative radiotherapy device, and the structure that can move in three dimensions is designed for the instrument for measuring the air kerma. The air kerma measuring instrument is adjusted in three directions by combining three directional positioning lasers, and the process is complex. The designed structure not only needs to fix the intraoperative radiotherapy device, but also needs to design a beam limiting device at the beam exit of the intraoperative radiotherapy rays.

[0006] During the measurement of the energy spectrum, the positioning device needs to be designed for the energy spectrum measuring instrument and the intraoperative radiotherapy device. The positioning device and the three-dimensional moving device need to be designed for the intraoperative radiotherapy device and the energy spectrum measuring instrument respectively. The limiting diaphragm needs to be designed for the energy spectrum measuring instrument during the measurement. The diaphragm plays a role in limiting the beam, reduces the photon fluence entering the energy spectrum measuring instrument, reduces the count rate, reduces the dead time of the energy spectrum measuring instrument, and facilitates the measurement of the energy spectrum.

[0007] The above measurement structures need to be designed separately according to different measurement requirements. The designed measurement structures are not only more and scattered, but also cannot simultaneously measure multiple dose parameters, which is high in cost and low in measurement efficiency. SUMMARY

[0008] The present application aims to provide a multifunctional dose measurement device for intraoperative radiotherapy equipment, solve the problems of low measurement efficiency and complex measurement device debugging process when measuring the energy spectrum and air kerma of the intraoperative radiotherapy equipment.

[0009] The technical scheme adopted by the present application is as follows:

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

[0011] The support adjustment module comprises a support base provided with an adjustment support at the bottom, a vertical positioning mechanism mounted on the surface of the support base, a triangular plate mounted on the vertical positioning mechanism and capable of sliding along the height direction of the vertical positioning mechanism, a scale mounted on the side surface of the vertical positioning mechanism, and a three-dimensional positioning mechanism mounted on the support base.

[0012] The energy spectrum measurement module comprises a back plate mounted on the upper surface of the triangular plate, an X-ray source positioning mechanism mounted on the back plate, an adjustment frame mounted on the X-ray source positioning mechanism and capable of moving along the height direction of the X-ray source positioning mechanism, an optical socket mounted on the adjustment frame, an X-ray source mounted on the upper surface of the optical socket, a spherical applicator mounted on the lower surface of the optical socket, a first right-angle plate mounted on the lower surface of the triangular plate, a first bearing assembly vertically connected to the first right-angle plate, an organic glass container mounted on the first bearing assembly, the spherical applicator extending into the organic glass container, the organic glass container being filled with deionized water, a second right-angle plate mounted on the three-dimensional positioning mechanism, a detector support mounted on the surface of the second right-angle plate, an energy spectrum measurement detector mounted on the detector support, a second bearing assembly mounted on the support base beside the three-dimensional positioning mechanism, and a beam-limit aperture mounted on the second bearing assembly, the beam-limit aperture, the entrance window of the energy spectrum measurement detector and the light tube of the X-ray source being coaxial.

[0013] The air kerma measurement module comprises an ionization chamber support mounted on the upper surface of the triangular plate, the ionization chamber support being used for fixing an ionization chamber, a back plate mounted on the lower surface of the triangular plate, a coupling support vertically connected to the back plate, a lead collimation shielding structure provided on the upper surface of the coupling support, an X-ray source fixing assembly mounted on the three-dimensional positioning mechanism, an X-ray source mounted on the X-ray source fixing assembly, an optical socket mounted on the top of the X-ray source, a spherical applicator mounted on the upper surface of the optical socket, and the light tube of the X-ray source, the lead collimation shielding structure and the entrance window of the ionization chamber being coaxial.

[0014] Further, the X-ray source fixing assembly is a PEEK block, and the bottom of the PEEK block is fixed on the three-dimensional positioning mechanism through bolts.

[0015] Further, the organic glass container is a polymethyl methacrylate cylinder with an opening.

[0016] Further, the material of the detector support is polymethyl methacrylate.

[0017] Further, the back plate is provided with a first interface group for connecting the X-ray source positioning mechanism and a second interface group for connecting the coupling support.

[0018] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0019] 1. In the present application, the energy spectrum measurement module and the air kerma measurement module are both installed on the support adjustment module, which can significantly improve the switching efficiency between modules and realize the function of measuring dose parameters in an integrated structure. In view of the problem of long recombination time of the traditional measurement system, the energy spectrum measurement module and the air kerma measurement module in the present application share the reference plane of the support base, so that the module disassembly and switching process does not need to reposition the reference plane, reducing the steps of repeated positioning adjustment. At the same time, the back plate is designed to be dual-purpose, which is used to connect the X-ray source positioning mechanism in the energy spectrum measurement module and to connect the coupling support in the air kerma measurement module. Through the preset first interface group and second interface group, the installation of the components is prevented from error and stupidity, improving the installation efficiency. The overall scheme adopts modular design, significantly improving the installation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings, wherein:

[0021] Fig. 1 Structure schematic view of the present application when installing the energy spectrum measurement module;

[0022] Fig. 2 Structure schematic view of the present application when installing the air kerma measurement module;

[0023] Marked in the figure: 1-X-ray source positioning mechanism, 2-vertical positioning mechanism, 3-X-ray source, 4-spherical applicator, 5-perspex container, 6-optical bayonet, 7-back plate, 8-triangle plate, 9-first right-angle plate, 10-beam limiting diaphragm, 11-detector support, 12-three-dimensional positioning mechanism, 13-first bearing assembly, 14-second bearing assembly, 15-second right-angle plate, 16-support base, 17-adjusting support, 18-scale, 19-lead collimating shielding structure, 20-coupling support, 21-X-ray source fixing assembly, 22-ionization chamber support. DETAILED DESCRIPTION

[0024] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0026] It should be noted that the numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only a simplified description for the convenience of describing the present application, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "link" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection, it can be mechanical connection or electrical connection, it can be direct connection or indirect connection through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The accompanying drawings are incorporated in and constitute a part of this specification. Figs. 1-2 ,

[0031] A multifunctional dose measuring device for an intraoperative radiotherapy device, comprising a support adjustment module, a spectrum measurement module, and an air kerma measurement module;

[0032] The support adjustment module comprises a support base provided with an adjustment support at the bottom, a vertical positioning mechanism installed on the surface of the support base, and a triangular plate installed on the vertical positioning mechanism and slidable along the height direction of the vertical positioning mechanism, and a scale is installed on the side surface of the vertical positioning mechanism, and a three-dimensional positioning mechanism is installed on the support base;

[0033] The spectrum measurement module comprises a back plate installed on the upper surface of the triangular plate, an X-ray source positioning mechanism installed on the back plate, an adjustment frame installed on the X-ray source positioning mechanism and movable along the height direction of the X-ray source positioning mechanism, an optical socket installed on the adjustment frame, an X-ray source installed on the upper surface of the optical socket, and a spherical applicator installed on the lower surface of the optical socket, a first right-angle plate installed on the lower surface of the triangular plate, a first bearing assembly connected perpendicularly on the first right-angle plate, an organic glass container installed on the first bearing assembly, the spherical applicator extending into the organic glass container, and the organic glass container filled with deionized water, a second right-angle plate installed on the three-dimensional positioning mechanism, a detector support installed on the surface of the second right-angle plate, and a spectrum measurement detector installed on the detector support, a second bearing assembly installed on the support base beside the three-dimensional positioning mechanism, and a beam-limiting diaphragm installed on the second bearing assembly, the beam-limiting hole of the beam-limiting diaphragm, the entrance window of the spectrum measurement detector, and the light pipe of the X-ray source being coaxial;

[0034] The air kerma measurement module comprises an ionization chamber support installed on the upper surface of the triangular plate, the ionization chamber support is used for fixing the ionization chamber, the lower surface of the triangular plate is provided with a back plate, the back plate is vertically connected with a connecting support, the upper surface of the connecting support is provided with a lead collimation shielding structure, and the air kerma measurement module further comprises an X-ray source fixing assembly installed on a three-dimensional positioning mechanism, the X-ray source fixing assembly is installed with an X-ray source, the top of the X-ray source is installed with an optical bayonet, the upper surface of the optical bayonet is installed with a spherical applicator, and the light pipe of the X-ray source, the lead collimation shielding structure and the incident window of the ionization chamber are coaxial.

[0035] Specifically, the X-ray source is produced by Zeiss, is an intraoperative radiotherapy source, and generates isotropic 50kV X-rays in a gold target half-sphere shell structure.

[0036] Specifically, the X-ray source positioning mechanism is a 150*100mm screw slide, a stepping motor drives a harmonic reducer to realize micron-level repeated positioning accuracy.

[0037] Specifically, the X-ray source fixing assembly is a 30*30*20mm PEEK block with a slotted tolerance of +0.1 / -0mm, and the bottom is installed to the three-dimensional positioning mechanism through 4*M4 bolts.

[0038] Specifically, the organic glass container is a polymethyl methacrylate cylinder (Φ100*150mm) with a wall thickness of 5mm, and the bottom of one end is opened and coaxially assembled with the beam limiting diaphragm (position degree ≤0.1mm).

[0039] Specifically, the back plate is divided into upper and lower rows of Φ8.5mm through holes and M6 threaded holes on the surface, which are respectively used for the X-ray source positioning mechanism of the energy spectrum module and the connecting support of the air kerma module.

[0040] Specifically, the lead collimation shielding structure is a lead cylinder with an outer diameter of Φ102mm, a spiral groove with a depth of 2mm and a pitch of 15mm is processed in the inner cavity, a Φ10±0.1mm through hole is matched with the light pipe of the X-ray source at the top, and the lead layer of the side wall is 10.2mm thick.

[0041] Specifically, the detector support is made of polymethyl methacrylate material, which is composed of a rectangular bottom plate and two rectangular frames, and is fixed to the second right-angle plate through 4*M5 bolts.

[0042] Specifically, the ionization chamber support is a polymethyl methacrylate U-shaped groove (width 25+0.1 / -0mm, length 100mm) which can move the ionization chamber in the groove.

[0043] Specifically, the vertical positioning mechanism is a Φ8mm screw slide structure (lead 1mm) matched with a vernier scale, a manual rotation torque is less than or equal to 2N·m, and a distance control accuracy within a stroke of 200mm is ±0.1mm.

[0044] In the implementation process of the embodiment, the energy spectrum measurement module is installed:

[0045] Firstly, the support base is leveled (horizontal error ≤0.1°) through four groups of adjusting supports. The back plate and the tripod are combined into an L-shaped structure through 4×M6 bolts, and the X-ray source positioning mechanism is fixed to the front surface of the back plate through 4×M6 bolts. The plexiglass container is placed above the first bearing assembly and is fixed to the first right-angle plate and the tripod below. Then, the corresponding installation of the X-ray source, the 4cm spherical applicator and the optical bayonet is completed. After the beam-limiting diaphragm is pressed into the center hole of the second bearing assembly, the position of the detector support is finely adjusted through the three-dimensional positioning mechanism until the laser collimator (external auxiliary tool) confirms that the X-ray source light pipe, the beam-limiting hole and the detector entrance window are coaxial (deviation ≤0.5mm).

[0046] The energy spectrum measurement mode is installed:

[0047] When the energy spectrum measurement module is disassembled, the deionized water in the plexiglass container is first emptied, the 4×M5 bolts of the detector support are unscrewed, the optical bayonet top screw is loosened, and then the X-ray source and the spherical applicator are pulled out. When the air kerma module is installed, the lead collimation shielding structure is fixed on the connecting support through 4×M4 bolts and is fixed to the back plate through M6 bolts. The ionization chamber support is inserted into the positioning pin on the upper surface of the tripod. The X-ray source fixing assembly is installed on the upper surface of the three-dimensional positioning mechanism, and the top screw is locked after the X-ray source is inserted. The position of the lead collimation shielding structure is adjusted, and the optical bayonet and the spherical applicator are installed in turn. Then, the ionization chamber is inserted into the ionization chamber support and the lateral top screw is locked. Finally, the laser collimator (external auxiliary tool) is used to confirm that the X-ray source light pipe, the lead collimation shielding structure and the ionization chamber entrance window are coaxial (deviation ≤0.5mm).

[0048] The above is the embodiment of the present application. The foregoing is each preferred embodiment of the present application, and each preferred embodiment can be arbitrarily combined and used if not obviously contradictory or with a certain preferred embodiment as a prerequisite. The embodiments and specific parameters in the embodiments are only for clearly describing the verification process of the application and do not limit the patent protection scope of the application. The patent protection scope of the application is still subject to its claims, and any equivalent structural changes made by using the content of the specification and drawings of the application should also be included in the protection scope of the application.

Claims

1. A multifunctional dose measurement device for intraoperative radiotherapy equipment, characterized in that, 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 back plate (7) mounted on the upper surface of a triangular plate (8). An X-ray source positioning mechanism (1) is mounted on the back plate (7). An adjustment frame that can move along the height direction of the X-ray source positioning mechanism (1) is mounted on the X-ray source positioning mechanism (1). An optical bayonet (6) is mounted on the adjustment frame. An X-ray source (3) is mounted on the upper surface of the optical bayonet (6). A spherical applicator (4) is mounted on the lower surface of the optical bayonet (6). A first right-angle plate (9) is mounted on the lower surface of the triangular plate (8). A first bearing assembly (13) is vertically connected to the first right-angle plate (9). An plexiglass container is mounted on the first bearing assembly (13). (5) The end of the 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). 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 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) is used to fix the ionization chamber. A back plate (7) is mounted on the lower surface of the triangular plate (8). A connecting bracket (20) is vertically connected to the back plate (7). A vertical collimation shielding structure (19) is provided on the upper surface of the connecting bracket (20). An X-ray source fixing assembly (21) is mounted on the three-dimensional positioning mechanism (12). An X-ray source (3) is mounted on the X-ray source fixing assembly (21). An optical bayonet (6) is mounted on the top of the X-ray source (3). A spherical applicator (4) is mounted on the upper surface of the optical bayonet (6). The light tube, the vertical collimation shielding structure (19), and the entrance window of the ionization chamber of the X-ray source (3) are coaxial.

2. A multifunctional dose measurement device for intraoperative radiotherapy equipment 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 multifunctional dose measurement device for intraoperative radiotherapy equipment according to claim 1, characterized in that, The plexiglass container (5) is a polymethyl methacrylate cylinder with an opening.

4. A multifunctional dose measurement device for intraoperative radiotherapy equipment according to claim 1, characterized in that, The detector bracket (11) is made of polymethyl methacrylate.

5. A multifunctional dose measurement device for intraoperative radiotherapy equipment according to claim 1, characterized in that, The back plate (7) is 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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