Isocenter detection device for 4-pi spherical radiotherapy accelerator

Abstract

The invention discloses an isocenter detection device for a 4-pi spherical radiotherapy accelerator, relates to the technical field of detection equipment of medical accelerators, and aims to solve the problem that an existing isocenter detector cannot meet the detection requirement of 4-pi radiotherapy equipment.The isocenter detection device is used for being installed at the front end of a treatment couch and comprises a fixed base, a movable base and a movable base, the fixing device is detachably arranged on the treatment bed; the measuring flat plate is rotationally connected with the fixed base through a rotating mechanism, the measuring flat plate extends out of the front end of the treatment bed in a suspended mode, the measuring flat plate rotates around the rack rotating shaft and the radiation head swing shaft, and the axis of the rack rotating shaft and the axis of the radiation head swing shaft are perpendicular to each other in the plane; the clamping device is arranged on the measuring flat plate, and the clamping device is used for clamping and loosening the dose absorbing material on the measuring flat plate; according to the arrangement, the detection requirement of the 4-pi radiotherapy equipment can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment for medical accelerators, and more particularly to an isocenter detection device for a 4π spherical radiotherapy accelerator. Background Art

[0002] In recent years, with the continuous development of medical technology, the field of radiotherapy has made significant progress. In particular, the increasing popularity of VMAT (Volumetric Modulated Arc Therapy) and the research and promotion of stereotactic radiotherapy (including 4π spherical radiotherapy) have greatly improved the precision and efficacy of radiotherapy. These advanced treatment technologies have placed higher demands on the performance of radiotherapy equipment. Performance indicators such as the mechanical isocenter accuracy of the accelerator, the consistency between the mechanical isocenter and the radiation beam isocenter, the consistency between the light field and the radiation field, the motion accuracy of the tungsten gate and multi-leaf collimator, the symmetry and uniformity of the radiation beam, and the stability of the random gantry angle changes, as well as the accuracy of their detection, have become key factors in ensuring treatment effectiveness.

[0003] However, common isocenter detectors currently available on the market have design limitations. Their measurement plates are equipped with only a single rotational axis, enabling rotation and measurement only along the gantry's rotational direction, and not along the oscillation direction of the radiation head. This design limits their detection range, restricting them to the testing requirements of conventional (single-plane gantry rotation) accelerators. 4π radiotherapy devices, due to their unique treatment modalities and complex motion mechanisms, require precise measurement in multiple directions. Existing isocenter detectors are unable to achieve this function and therefore fail to meet the testing requirements of 4π radiotherapy devices. This not only restricts the promotion and application of 4π radiotherapy technology but also affects the comprehensiveness and accuracy of radiotherapy equipment performance testing.

[0004] Therefore, how to solve the problem that the existing isocenter detector cannot meet the detection requirements of 4π radiotherapy equipment is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide an isocenter detection device for a 4π spherical radiotherapy accelerator, which can meet the detection requirements of 4π radiotherapy equipment.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An isocenter detection device for a 4π spherical radiotherapy accelerator, for installation at the front end of a treatment couch, comprising:

[0008] Fixed base, detachable and set on the treatment bed;

[0009] The measuring plate is rotatably connected to the fixed base via a rotating mechanism, and the measuring plate is suspended and extends out of the front end of the treatment bed. The measuring plate rotates around the gantry rotation axis and the radiation head swing axis, and the axes of the gantry rotation axis and the radiation head swing axis are perpendicular to each other in the plane;

[0010] The clamping device is arranged on the measuring plate and is used for clamping and releasing the dose absorbing material on the measuring plate.

[0011] Preferably, the fixed base includes a fixed sleeve and a base bracket, the fixed sleeve is sleeved on the treatment bed, and the base bracket and the fixed sleeve are connected by an adjusting bolt.

[0012] Preferably, the rotating mechanism includes a rotating frame, a first connecting member and a second connecting member, the rotating frame is rotatably connected to the base bracket through the first connecting member, and the rotating frame is rotatably connected to the measuring plate through the second connecting member, the first connecting member is used to control the rotating frame to rotate along the direction of the frame rotation axis, and the second connecting member is used to control the measuring plate to rotate along the direction of the radiation head swing axis.

[0013] Preferably, the rotating frame is a U-shaped structure, the second connecting members are provided on both sides of the rotating frame, and the second connecting members are connected to the measuring plate via an angle plate.

[0014] Preferably, the first connecting member and the second connecting member are both bearings, and the bearings include a bearing seat, a deep groove ball bearing and a rotating shaft, and the rotating shaft is rotatably arranged on the bearing seat through the deep groove ball bearing.

[0015] Preferably, the rotating mechanism further includes a first positioning mechanism for limiting the position of the rotating frame and a second positioning mechanism for limiting the position of the measuring plate.

[0016] Preferably, the first positioning mechanism and the second positioning mechanism both include positioning pins and several positioning holes. The positioning pins are movably arranged on the base bracket and the rotating frame. The several positioning holes are circumferentially arranged on the rotating frame and the angle plate. The positioning pins are pluggable and arranged on the positioning holes.

[0017] Preferably, the measuring plate includes a first measuring plate and a second measuring plate, the first measuring plate is provided with a slot for mounting the second measuring plate, the contact surfaces of the first measuring plate and the second measuring plate are separated from each other and have a gap for inserting a film, both sides of the first measuring plate are rotatably connected to the rotating frame through an angle plate, the centers of the first measuring plate and the second measuring plate overlap and are both provided with measuring holes.

[0018] Preferably, the first measuring plate and the second measuring plate are both transparent organic glass plates.

[0019] Preferably, four clamping devices are provided and distributed at the four corners of the measuring plate. The clamping device includes a connecting bracket and a clamping bolt movably provided on the connecting bracket. One end of the connecting bracket is connected to the bottom of the measuring plate, and the other end of the connecting bracket is connected to the clamping bolt.

[0020] The isocenter detection device for a 4π spherical radiotherapy accelerator provided by the present invention is used to be installed at the front end of a treatment bed, so that the relative position of the detection device and the treatment equipment is fixed and stable, which is convenient for operators to perform detection operations. The device includes a fixed base, a measuring plate and a clamping device. The fixed base is detachably arranged on the treatment bed. The detachable design allows the fixed base to be quickly replaced and installed according to different models of treatment beds, thereby enhancing the versatility and adaptability of the device. The measuring plate is rotatably connected to the fixed base through a rotating mechanism, and the measuring plate is suspended and extends out of the front end of the treatment bed, ensuring that there is no obstruction between the measuring plate and the accelerator light field at all detection angles, thereby improving the accuracy and reliability of the measurement. The measuring plate rotates around the gantry rotation axis and the radiation head swing axis. The axes of the gantry rotation axis and the radiation head swing axis are perpendicular to each other in the plane. The measuring plate can move around two mutually perpendicular rotation axes, so that it can be perpendicular to the beam direction of the radiation head at any angle in the spherical space, thereby meeting the detection requirements of conventional accelerators and 4π spherical radiotherapy accelerators, significantly improving the applicability of the detection device. The clamping device is provided on the measuring plate. The clamping device is used to clamp and release the dose absorbing material on the measuring plate. The clamping device can fix dose absorbing materials such as solid water or organic glass plates of different thicknesses to provide dose building / scattering objects for the film, thereby meeting the needs of different detection items and enhancing the functionality and flexibility of the device.

[0021] The isocenter detection device for a 4π spherical radiotherapy accelerator set up in the above manner uses a dual-rotation axis design of the measuring plate, which ensures that it is always perpendicular to the beam output direction of the radiation head at any angle in the spherical space, meeting the detection requirements of conventional and 4π radiotherapy equipment, and significantly improving the applicability of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the installation of the isocenter detection device for a 4π spherical radiotherapy accelerator provided by the present invention;

[0024] Figure 2This is a schematic structural diagram of the isocenter detection device for a 4π spherical radiotherapy accelerator provided by the present invention;

[0025] Figure 3 for Figure 2 Structural diagram from another perspective;

[0026] Figure 4 This is a schematic structural diagram of the angle plate provided by the present invention;

[0027] Figure 5 for Figure 2 sectional view of

[0028] Figure 6 for Figure 2 A cross-sectional view from another perspective;

[0029] Figure 7 for Figure 2 Schematic diagram of the structure from another perspective.

[0030] Reference numerals:

[0031] 10-treatment bed, 20-film;

[0032] 1-fixed base, 11-fixed sleeve, 12-base bracket, 13-adjusting bolt;

[0033] 2- measuring plate, 21- first measuring plate, 22- second measuring plate, 23- measuring hole;

[0034] 3-rotating mechanism, 31-rotating frame, 32-first connecting piece, 321-first bearing seat, 322-first rotating shaft, 323-first deep groove ball bearing, 324-end cover, 33-second connecting piece, 331-second bearing seat, 332-second rotating shaft, 333-second deep groove ball bearing, 34-angle plate, 35-locating pin, 36-locating hole;

[0035] 4-clamping device, 41-connecting bracket, 42-clamping bolt. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] It should be noted that the directional words such as "front, back, left, right" below are defined based on the drawings in the specification.

[0039] The core of the present invention is to provide an isocenter detection device for a 4π spherical radiotherapy accelerator, which can meet the detection requirements of 4π radiotherapy equipment.

[0040] Please refer to Figure 1 , an isocenter detection device for a 4π spherical radiotherapy accelerator is used to be installed at the front end of a treatment bed 10, so that the relative position of the detection device and the treatment equipment is fixed and stable, which is convenient for the operator to perform detection operations.

[0041] Specifically, the device includes a fixed base 1, a measuring plate 2 and a clamping device 4. The fixed base 1 is detachably mounted on the treatment bed 10. The detachable design allows the fixed base 1 to be quickly replaced and installed according to different models of treatment beds 10, thereby enhancing the versatility and adaptability of the device. The measuring plate 2 is rotatably connected to the fixed base 1 through a rotating mechanism 3, and the measuring plate 2 is suspended from the front end of the treatment bed 10, ensuring that there is no obstruction between the measuring plate 2 and the accelerator light field at all detection angles, thereby improving the accuracy and reliability of the measurement. The measuring plate 2 rotates around the frame rotation axis and the radiation head swing axis. The frame rotation axis and the radiation head swing axis The axes are perpendicular to each other in the plane, and the measuring plate 2 can move around two mutually perpendicular rotation axes so that it can be perpendicular to the beam direction of the radiation head at any angle in the spherical space, thereby meeting the detection requirements of conventional accelerators and 4π spherical radiotherapy accelerators, and significantly improving the applicability of the detection device. The clamping device 4 is provided on the measuring plate 2, and the clamping device 4 is used to clamp and release the dose absorbing material on the measuring plate 2. The clamping device 4 can fix dose absorbing materials such as solid water or organic glass plates of different thicknesses to provide dose building / scattering objects for the film 20, thereby meeting the needs of different detection items and enhancing the functionality and flexibility of the device.

[0042] Among them, both the fixed base 1 and the measuring plate 2 adopt a replaceable structure. By replacing different fixed bases 1, different models of treatment beds 10 can be adapted; by replacing different types of measuring plates 2, the needs of different detection projects can be met, enhancing the versatility and flexibility of the device.

[0043] The isocenter detection device for a 4π spherical radiotherapy accelerator set up in the above manner uses a dual-rotation axis design of the measuring plate 2, so that it is always perpendicular to the beam output direction of the radiation head at any angle in the spherical space, meeting the detection requirements of conventional and 4π radiotherapy equipment, and significantly improving the applicability of the detection device.

[0044] Please refer to Figure 2 The fixed base 1 includes a fixed sleeve 11 and a base bracket 12 . The fixed sleeve 11 is sleeved on the treatment bed 10 . The base bracket 12 is connected to the fixed sleeve 11 through an adjusting bolt 13 .

[0045] It should be noted that the fixed sleeve 11 is designed to fit the structure at the front end of the treatment bed 10. Through the shape and size of its inner wall, it is tightly fitted on the front end of the treatment bed 10, thereby achieving preliminary fixation. The fixed sleeve 11 is fixedly connected to the treatment bed 10 by fixing bolts. By replacing the fixed sleeve 11, the device can be adapted to the treatment bed 10 of different radiotherapy equipment. The base bracket 12 is connected to the fixed sleeve 11 by an adjusting bolt 13. The adjusting bolt 13 passes through the threaded hole on the base bracket 12 and matches the corresponding hole on the fixed sleeve 11. By rotating the adjusting bolt 13, the relative position between the base bracket 12 and the fixed sleeve 11 can be adjusted, thereby achieving precise adjustment of the position and posture of the entire device on the treatment bed 10, so that the fixed base 1 can be firmly installed on the treatment bed 10 and can be flexibly adjusted according to different treatment bed 10 models and testing requirements.

[0046] In one embodiment, the base bracket 12 is connected to the fixed sleeve 11 via three adjustment bolts 13, two of which are located at the front and one at the rear, with the three adjustment bolts 13 arranged in a triangular pattern. By adjusting the height difference between the screw-in heights of the three adjustment bolts 13, the pitch (i.e., front-to-back height) and roll (i.e., left-to-right height) of the base bracket 12 and the connected measuring plate 2 can be adjusted.

[0047] In practical applications, there is no restriction on the number and location of the adjusting bolts 13 connecting the base bracket 12 and the fixing sleeve 11 , and they can be adaptively adjusted according to actual conditions.

[0048] The base bracket 12 has an L-shaped structure, providing a stable support foundation for the entire device. It can effectively distribute and bear the weight of the device, ensuring the stability of the device during installation and use, and reducing measurement errors caused by an unstable center of gravity or loose structure. The L-shaped base bracket 12 can rationally utilize space, making the device installation at the front end of the treatment bed 10 more compact and stable. This not only saves space but also provides sufficient operating space for other components (such as the rotating frame 31 and the measuring plate 2), ensuring the rationality and functionality of the overall layout of the device. The base bracket 12 includes a horizontal plate and a vertical plate that are perpendicular to each other. A reinforcement plate is also provided between the horizontal plate and the vertical plate. The horizontal plate is connected to the fixed sleeve 11 via an adjusting bolt 13, and the vertical plate is connected to the measuring plate 2 via a rotating mechanism 3. The front side refers to the end of the horizontal plate that is closest to the vertical plate, and the rear side refers to the end of the horizontal plate that is farther away from the vertical plate.

[0049] In the above case, the rotating mechanism 3 includes a rotating frame 31, a first connecting member 32, and a second connecting member 33. The rotating frame 31 is rotatably connected to the base bracket 12 through the first connecting member 32, and the rotating frame 31 is rotatably connected to the measuring plate 2 through the second connecting member 33. The first connecting member 32 is used to control the rotation of the rotating frame 31 along the direction of the frame rotation axis, and the second connecting member 33 is used to control the rotation of the measuring plate 2 along the direction of the radiation head swing axis.

[0050] It is understandable that the first connecting member 32 controls the rotation of the rotating frame 31 along the direction of the frame rotation axis, and the second connecting member 33 controls the rotation of the measuring plate 2 along the direction of the radiation head swing axis, so that the measuring plate 2 can always be perpendicular to the radiation head beam direction at any angle in spherical space, thereby meeting the detection requirements of conventional and 4π radiotherapy equipment, significantly improving the applicability and flexibility of the detection device. The measuring plate 2 can freely adjust its position in the two rotation axis directions to ensure that it is always perpendicular to the radiation head beam direction at different detection angles. This precise motion control capability effectively avoids measurement errors caused by the measurement plate 2 not being perpendicular to the radiation beam, improves the accuracy and reliability of detection, and provides more accurate data support for the performance evaluation of radiotherapy equipment. The design of the rotating mechanism 3 makes the motion range and angle adjustment of the measuring plate 2 more flexible, and can adapt to different models of radiotherapy equipment and different detection project requirements. This universal design reduces dependence on specific equipment or detection projects and improves the versatility and economy of the device.

[0051] Among them, through the clear division of labor between the first connecting member 32 and the second connecting member 33, the operator can more intuitively control the movement direction and angle of the measuring plate 2, which simplifies the operation process, reduces the difficulty of operation, makes the detection work more efficient, reduces the measurement error caused by improper operation, and improves the detection efficiency.

[0052] Please refer to Figure 3 and Figure 4 The rotating frame 31 is a U-shaped structure. The second connecting members 33 are provided on both sides of the rotating frame 31 . The second connecting members 33 are connected to the measuring plate 2 through the angle plate 34 .

[0053] It should be noted that the rotating frame 31 adopts a U-shaped structure, which not only provides sufficient mechanical strength and stability to ensure the position accuracy of the measuring plate 2 during the rotation process, but also provides sufficient space for the installation and movement of the measuring plate 2, so that the measuring plate 2 can rotate freely on both sides of the rotating frame 31, thereby enhancing the overall flexibility of the device. The rotating frame 31 specifically includes a bottom plate for connecting to the base bracket 12 and side plates provided at both ends of the bottom plate, and the side plates are connected to the angle plate 34 through a second connecting member 33. The combined design of the rotating frame 31 with a U-shaped structure and the angle plate 34 allows the measuring plate 2 to be flexibly adjusted according to different detection items and equipment models, thereby enhancing the versatility and adaptability of the device, and not only meeting the detection requirements of conventional and 4π radiotherapy equipment, but also being able to adapt to new detection requirements and technological developments that may arise in the future.

[0054] Furthermore, the second connecting member 33 is connected to the measuring plate 2 via an angle disc 34. The design of the angle disc 34 allows the rotation angle of the measuring plate 2 to be precisely controlled and adjusted. The operator can accurately adjust the measuring plate 2 to the desired angular position using the scale or markings on the angle disc 34, ensuring that the measuring plate 2 remains perpendicular to the beam direction of the radiation head at any angle in spherical space. This improves the accuracy and reliability of detection and provides more accurate data support for the performance evaluation of radiotherapy equipment. Furthermore, by connecting the measuring plate 2 via the angle disc 34, the operator can more intuitively observe and adjust the angle of the measuring plate 2, reducing operational complexity and time costs, making the detection process more efficient and improving detection efficiency. This also reduces the operator's skill level requirements, making the device easier to use and maintain.

[0055] Please refer to Figure 5 and Figure 6 The first connecting member 32 and the second connecting member 33 are both bearings. The bearings include a bearing seat, a deep groove ball bearing and a rotating shaft. The rotating shaft is rotatably arranged on the bearing seat through the deep groove ball bearing.

[0056] As will be appreciated, the independent design of the first and second connectors 32, 33 allows the device to adapt to different testing requirements and equipment models. Whether used with conventional radiotherapy equipment or 4π spherical radiotherapy equipment, the device achieves high-quality testing through precise rotational control, enhancing its versatility and adaptability. The rotational motion enabled by the bearing structure enables precise angular adjustment of the measurement plate 2 and rotating frame 31. Operators can easily adjust the measurement plate 2 to the desired angular position based on testing requirements, achieving highly accurate testing. This precise angular adjustment capability is crucial for performance testing of radiotherapy equipment, as it directly impacts the accuracy and reliability of test results. The efficient rotational performance of the bearing structure ensures smoother and faster movement of the measurement plate 2 and rotating frame 31, reducing time delays caused by mechanical adjustments. This design not only improves testing efficiency but also reduces operator workload, making testing more efficient and convenient. The bearing structure also facilitates maintenance and replacement. If a bearing becomes worn or fails, it can be replaced individually without replacing the entire connector, reducing maintenance costs and time.

[0057] In a feasible embodiment, the first connecting member 32 includes a first bearing seat 321, a first rotating shaft 322, a first deep groove ball bearing 323 and an end cover 324. The first bearing seat 321 is fixed to one side of the base bracket 12, and the first rotating shaft 322 is rotatably arranged on the first bearing seat 321 through the first deep groove ball bearing 323. The end cover 324 is arranged at the end of the first bearing seat 321 away from the base bracket 12. The second connecting member 33 includes a second bearing seat 331, a second rotating shaft 332 and a second deep groove ball bearing 333. The second bearing seat 331 is fixed to the outer side of the side plate of the rotating frame 31, and the second rotating shaft 332 is rotatably arranged on the second bearing seat 331 through the second deep groove ball bearing 333, and the base bracket 12 and the side plate are respectively provided with through holes for the first rotating shaft 322 and the second rotating shaft 332 to pass through. The first bearing seat 321 and the second bearing seat 331 provide stable support structures for the first rotating shaft 322 and the second rotating shaft 332 respectively. The first bearing seat 321 and the second bearing seat 331 can be firmly fixed on the base bracket 12 and the rotating frame 31 respectively, and the end cover 324 can prevent dust and impurities from entering the interior of the bearing, thereby protecting the normal operation of the bearing.

[0058] Among them, deep groove ball bearings have the characteristics of low friction coefficient and high load capacity. They can effectively reduce friction and energy loss during rotation, while reducing wear between mechanical parts. This not only improves the operating efficiency of the device, but also reduces maintenance costs, ensuring the long-term and stable operation of the device.

[0059] On the basis of the above embodiment, the rotating mechanism 3 further includes a first positioning mechanism for limiting the position of the rotating frame 31 and a second positioning mechanism for limiting the position of the measuring plate 2 .

[0060] It should be noted that by providing a first positioning mechanism and a second positioning mechanism, each used to limit the position of the rotating frame 31 and the measuring plate 2, precise positional control of the rotating frame 31 and the measuring plate 2 is achieved. This ensures that the measuring plate 2 accurately remains at the desired angle and position during the inspection process, thereby improving the accuracy and reliability of the inspection. The design of the positioning mechanism makes it easier for the operator to adjust the rotating frame 31 and the measuring plate 2 to the desired position and secure them using the positioning mechanism. This simplifies the operation process, reduces operational difficulty, improves inspection efficiency, and also reduces measurement errors caused by improper operation.

[0061] Please refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The first positioning mechanism and the second positioning mechanism both include a positioning pin 35 and a plurality of positioning holes 36. The positioning pin 35 is movably arranged on the base bracket 12 and the rotating frame 31. The plurality of positioning holes 36 are circumferentially arranged on the rotating frame 31 and the angle plate 34. The positioning pin 35 is pluggable and arranged in the positioning hole 36.

[0062] It is understood that both the first and second positioning mechanisms utilize a design comprising positioning pins 35 and a plurality of positioning holes 36. The positioning holes 36 are circumferentially distributed on the rotating frame 31 and the angle disc 34, enabling precise angular positioning of the rotating frame 31 and the measuring plate 2, ensuring that the measuring plate 2 accurately remains at the desired angular position during the testing process. By providing multiple positioning holes 36, the device can adapt to a variety of testing requirements. Different positioning holes 36 correspond to different angles, and the operator can select the appropriate angle based on the specific test item. By selecting different positioning holes 36, the measuring plate 2 can be easily adjusted to a specific angle, thereby improving the accuracy and reliability of the test and enhancing the versatility and flexibility of the device.

[0063] The positioning pin 35 is removably inserted into the positioning hole 36, allowing the operator to quickly adjust the angle of the measuring plate 2 according to different testing requirements. This flexible angle adjustment capability not only meets the needs of various testing projects but also improves the versatility and adaptability of the device, enabling it to adapt to different models of radiotherapy equipment and different testing scenarios. The design of the positioning pin 35 and positioning hole 36 makes angle adjustment and maintenance of the measuring plate 2 more convenient. If angle adjustment or maintenance is required, the operator can quickly remove the positioning pin 35, make the necessary adjustments or maintenance, and then reinsert it into the positioning hole 36, improving the maintenance efficiency of the device.

[0064] The first connector 32 and the first positioning mechanism cooperate to control the rotating frame 31 to rotate 360° around the rotation axis of the radiotherapy device in 45° (or other specified angle) increments. The second connector 33 and the second positioning mechanism cooperate to control the measurement plate 2 to rotate 360° around the radiation head swing axis in 30° (or other specified angle) increments about the centerline of the two bearings.

[0065] As a preferred embodiment, the measuring plate 2 includes a first measuring plate 21 and a second measuring plate 22. The first measuring plate 21 is provided with a slot for mounting the second measuring plate 22. The contact surfaces of the first measuring plate 21 and the second measuring plate 22 are separated from each other and have a gap for inserting the film 20. Both sides of the first measuring plate 21 are rotatably connected to the rotating frame 31 via an angle plate 34. The centers of the first measuring plate 21 and the second measuring plate 22 overlap and are both provided with a measuring hole 23.

[0066] It should be noted that the measurement plate 2 consists of a first measurement plate 21 and a second measurement plate 22. The first measurement plate 21 is provided with a slot for mounting the second measurement plate 22. This split design allows the measurement plate 2 to be flexibly adjusted and replaced according to different testing requirements. For example, different types of first and second measurement plates 21, 22 can be replaced depending on the test project, thereby meeting diverse testing needs. The contact surfaces of the first and second measurement plates 21, 22 are separated from each other, forming a gap for inserting the film 20. This ensures that the film 20 can be accurately placed within the measurement plate 2 and avoids measurement errors caused by inaccurate positioning of the film 20. The gap also facilitates the insertion and removal of the film 20, improving operational convenience. The first and second measurement plates 21, 22 overlap in center and are both equipped with a measurement hole 23. This ensures that the measurement plate 2 is aligned during rotation, ensuring that the measurement hole 23 is always located at the center of the radiation beam. This alignment not only improves measurement accuracy but also reduces measurement errors caused by positional deviation.

[0067] Furthermore, both sides of the first measurement plate 21 are rotatably connected to the rotating frame 31 via angle discs 34, enabling precise rotational adjustment of the measurement plate 2 around the radiation head's swing axis. The use of angle discs 34 further improves the precision and stability of rotation, ensuring the positional accuracy of the measurement plate 2 at various angles, thereby enhancing detection accuracy.

[0068] In the above case, the first measurement plate 21 and the second measurement plate 22 are both transparent organic glass plates.

[0069] It will be appreciated that both the first measurement plate 21 and the second measurement plate 22 are made of transparent organic glass. This material has a high degree of transparency, allowing for clear observation of the film 20, marking lines, and other detection elements within. This visual design allows the operator to visually check the placement of the film 20, the accuracy of the markings, and the position of the radiation beam during the detection process, thereby improving the accuracy and reliability of the detection. Furthermore, the transparent organic glass plate has a low scattering effect during detection of radiotherapy equipment and does not significantly interfere with the radiation beam. This characteristic ensures the clarity and consistency of the radiation beam during detection, reduces measurement errors caused by material scattering, and improves the accuracy of the detection results.

[0070] Furthermore, the plexiglass plates can be etched with surface marking lines, embedded with metal marking balls, or placed with marking holes at arbitrary or specific locations. The plexiglass plates are interchangeable, and by replacing the plexiglass plates with different markings, the measurement requirements of different testing projects can be met. Coordinate paper can be clamped between the two plexiglass plates to check the accuracy of the radiotherapy equipment's laser positioner indications, the positioning accuracy of the tungsten gate and multi-leaf collimator, and the various motion axes of the radiotherapy equipment. Film 20 can also be clamped and filmed to complete testing and adjustment of items such as radiation beam performance indicators, light field consistency, and mechanical-radiation field center position consistency.

[0071] The organic glass plate is relatively light, which reduces the overall weight of the measuring plate 2 and facilitates installation, adjustment and maintenance by operators. The organic glass plate is relatively low in cost and easy to obtain, which reduces the manufacturing cost of the measuring plate 2.

[0072] Please refer to Figure 7 There are four clamping devices 4, which are distributed at the four corners of the measuring plate 2. The clamping device 4 includes a connecting bracket 41 and a clamping bolt 42 movably provided on the connecting bracket 41. One end of the connecting bracket 41 is connected to the bottom of the measuring plate 2, and the other end of the connecting bracket 41 is connected to the clamping bolt 42.

[0073] It should be noted that four clamping devices 4 are provided, distributed at the four corners of the measurement plate 2. This layout ensures that the dose-absorbing material (such as solid water or a plexiglass sheet) is evenly and stably clamped on the measurement plate 2. The symmetrical distribution of the four clamping devices 4 provides stable support, preventing material tilting or loosening due to uneven clamping, thereby improving the stability and reliability of the test. The clamping device 4 includes a connecting bracket 41 and a clamping bolt 42 movably mounted on the connecting bracket 41. By rotating the clamping bolt 42, the clamping tightness can be flexibly adjusted to accommodate dose-absorbing materials of varying thicknesses and shapes. This allows the operator to quickly adjust the clamping device 4 according to specific testing requirements, ensuring that the dose-absorbing material is securely fixed to the measurement plate 2.

[0074] Before actual measurement, the device must be installed and positioned:

[0075] Insert the fixed base 1 into the front end of the treatment bed 10 and tighten the fixing bolts to firmly secure the fixed base 1 to the treatment bed 10. Return the positions of the rotating frame 31 and the measuring plate 2 to zero, positioning the measuring plate 2 at the zero measurement position. Adjust the adjustment bolts 13 for the position of the treatment bed 10 and the posture of the fixed base 1 so that the rotation axis of the rotating frame 31 coincides with the accelerator's gantry rotation axis (or its marking line), and the rotation axis of the measuring plate 2 coincides with the accelerator's radiation head swing axis (or its marking line). After positioning is completed, carry out corresponding measurements according to different inspection items.

[0076] For example, the mechanical motion accuracy and repeatability of the moving parts such as the treatment couch 10, the gantry, and the radiation head, as well as the positional consistency between the mechanical isocenter and the radiation beam isocenter, are tested:

[0077] During measurement, a coordinate paper or film 20 is clamped in the measuring plate 2, and the position of the coordinate paper is adjusted so that its center crosshairs coincide with the crosshairs of the measuring plate 2, or the film 20 is adjusted so that it is located at the desired position. When the treatment bed 10, the frame, or the radiation head and other components are rotated to different angles, the light field projection is observed or the radiation field film 20 is photographed. By observing the changes in the projection position of the light field crosshairs on the coordinate paper or analyzing the changes in the position of the radiation field in the photographed film 20, the mechanical motion deviation and repeatability of the moving components such as the treatment bed 10, the frame, and the radiation head in different motion dimensions, as well as the position consistency of the mechanical isocenter and the radiation beam isocenter, are calculated to identify whether the equipment has problems such as mechanical looseness and positioning error, and adjust the corresponding moving components.

[0078] For example, the accuracy and repeatability of the tungsten gate and multi-leaf collimator are tested:

[0079] A coordinate paper or film 20 is clamped in the measuring plate 2, and the position of the coordinate paper is adjusted so that its center crosshairs coincide with the crosshairs of the measuring plate 2, or the film 20 is adjusted so that it is located at the desired position. The tungsten gate or multi-leaf collimator is controlled to move to different mechanical positions respectively. The positioning accuracy and repeatability of the tungsten gate and multi-leaf collimator are detected by observing the projection position of the light field of the tungsten gate or multi-leaf collimator on the coordinate paper or photographing and analyzing the radiation field film 20.

[0080] Exemplary verification of the consistency of the light field of a tungsten gate and a multi-leaf collimator:

[0081] A film 20 is clamped in the measuring plate 2, and marks are made on the film 20 according to the light field indication. The beam is emitted and the film 20 is photographed. The deviation between the light field and the radiation field is analyzed by the film 20 analysis software.

[0082] Exemplary, inspection radiation beam performance indicators:

[0083] A film 20 is clamped in the measuring plate 2, and the film 20 is adjusted to be in the desired position. The tungsten gate or multi-leaf collimator forms a specific radiation field, and the film 20 is photographed after the beam is emitted. The radiation beam performance index is analyzed through the film 20 analysis software.

[0084] For example, the radiation beam performance indicators and the stability of the movement of the tungsten gate and multi-leaf collimator relative to the angular position changes of the random frame or the radiation head are tested:

[0085] During measurement, a coordinate paper or film 20 is clamped in the measuring plate 2, and the position of the coordinate paper is adjusted so that its center cross line coincides with the cross line of the measuring plate 2, or the film 20 is adjusted so that it is in the desired position. The frame and the radiation head are rotated to different angular positions, and the rotating frame 31 and the measuring plate 2 are rotated at the same time so that they are perpendicular to the beam direction of the radiation head. By measuring and analyzing the changes in the light field or radiation field of the tungsten gate and the multi-leaf collimator at the same field position at different frame and radiation head movement angles, the consistency of the movement of the tungsten gate and the multi-leaf collimator with the frame and radiation head is tested; by analyzing the films 20 shot at different angular positions of the same field, the stability of the radiation beam performance indicators with the angular changes of the frame and radiation head can also be analyzed.

[0086] Exemplary, check and adjust the indication accuracy of the laser positioning device:

[0087] During measurement, a coordinate paper is inserted into the measuring plate 2 and the position of the coordinate paper is adjusted so that its center crosshairs coincide with the crosshairs of the measuring plate 2. By rotating the measuring plate 2 to a specific angle, the indication accuracy of the laser locator can be adjusted according to the center crosshair mark on the surface of the measuring plate 2 or the coordinate paper.

[0088] In summary, the isocenter detection device for a 4π spherical radiotherapy accelerator provided by the present invention introduces a radiation head swing direction movement axis perpendicular to the gantry rotation movement axis for the measurement plate 2, so that the measurement plate 2 can rotate not only around the gantry rotation axis, but also around the radiation head swing axis, so that the measurement plate 2 can always remain perpendicular to the radiation head beam direction at any angle in the spherical space, thereby meeting the detection requirements of conventional radiotherapy equipment and 4π spherical radiotherapy equipment at the same time; this device is fixed to the front end of the treatment bed 10, and the measurement plate 2 is partially suspended in the air, ensuring that the measurement plate 2 is perpendicular to the radiation head beam direction at all detection angles in the spherical space. There is no obstruction between the device and the accelerator light field, thus ensuring high accuracy of the measurement results; the fixed base 1 and the measuring plate 2 of the device both adopt a replaceable structure. By replacing different fixed bases 1, the device can adapt to a variety of different models of treatment beds 10; and by replacing different types of measuring plates 2, the diverse needs of different detection items can be met; in addition, the device is also specially designed with a clamping device 4, which can fix a certain thickness of solid water or organic glass plate and other dose absorbing materials on the measuring plate 2 to provide the necessary dose construction and scattering objects for the film 20, thereby meeting the measurement needs of different detection items.

[0089] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] The above describes in detail the isocenter detection device for a 4π spherical radiotherapy accelerator provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An isocenter detection device for a 4π spherical radiotherapy accelerator, for installation at the front end of a treatment bed (10), characterized in that: include: A fixed base (1) detachably mounted on the treatment bed (10); A measuring plate (2) is rotatably connected to the fixed base (1) via a rotating mechanism (3), and the measuring plate (2) is suspended and extends out of the front end of the treatment bed (10). The measuring plate (2) rotates around the frame rotation axis and the radiation head swing axis, and the axes of the frame rotation axis and the radiation head swing axis are perpendicular to each other in a plane; A clamping device (4) is provided on the measuring plate (2), and the clamping device (4) is used to clamp and release the dose absorbing material on the measuring plate (2).

2. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 1, characterized in that: The fixed base (1) comprises a fixed sleeve (11) and a base bracket (12); the fixed sleeve (11) is sleeved on the treatment bed (10); and the base bracket (12) and the fixed sleeve (11) are connected via an adjusting bolt (13).

3. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 2, characterized in that: The rotating mechanism (3) comprises a rotating frame (31), a first connecting member (32) and a second connecting member (33); the rotating frame (31) is rotatably connected to the base bracket (12) via the first connecting member (32); the rotating frame (31) is rotatably connected to the measuring plate (2) via the second connecting member (33); the first connecting member (32) is used to control the rotating frame (31) to rotate along the direction of the frame rotation axis; the second connecting member (33) is used to control the measuring plate (2) to rotate along the direction of the radiation head swing axis.

4. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 3, characterized in that: The rotating frame (31) is a U-shaped structure, the second connecting member (33) is provided on both sides of the rotating frame (31), and the second connecting member (33) is connected to the measuring plate (2) via an angle plate (34).

5. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 4, characterized in that: The first connecting member (32) and the second connecting member (33) are both bearings, and the bearings include a bearing seat, a deep groove ball bearing, and a rotating shaft, and the rotating shaft is rotatably arranged on the bearing seat through the deep groove ball bearing.

6. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 5, characterized in that: The rotating mechanism (3) further comprises a first positioning mechanism for limiting the position of the rotating frame (31) and a second positioning mechanism for limiting the position of the measuring plate (2).

7. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 6, characterized in that: The first positioning mechanism and the second positioning mechanism both comprise a positioning pin (35) and a plurality of positioning holes (36); the positioning pin (35) is movably arranged on the base bracket (12) and the rotating frame (31); the plurality of positioning holes (36) are circumferentially arranged on the rotating frame (31) and the angle plate (34); and the positioning pin (35) is pluggable and arranged in the positioning hole (36).

8. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 7, characterized in that: The measuring plate (2) comprises a first measuring plate (21) and a second measuring plate (22), the first measuring plate (21) being provided with a slot for mounting the second measuring plate (22), the contact surfaces of the first measuring plate (21) and the second measuring plate (22) being separated from each other and having a gap for inserting a film, the two sides of the first measuring plate (21) being rotatably connected to the rotating frame (31) via the angle disc (34), the centers of the first measuring plate (21) and the second measuring plate (22) being overlapped and both being provided with a measuring hole (23).

9. The isocenter detection device for a 4π spherical radiotherapy accelerator according to claim 8, characterized in that: The first measurement plate (21) and the second measurement plate (22) are both transparent organic glass plates.

10. The isocenter detection device for a 4π spherical radiotherapy accelerator according to any one of claims 1 to 9, characterized in that: Four clamping devices (4) are provided and distributed at the four corners of the measuring plate (2). The clamping device (4) includes a connecting bracket (41) and a clamping bolt (42) movably arranged on the connecting bracket (41). One end of the connecting bracket (41) is connected to the bottom of the measuring plate (2), and the other end of the connecting bracket (41) is connected to the clamping bolt (42).

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