A sealed water tank for end - of - treatment quality assurance during radiotherapy

Abstract

The present application relates to a sealed water tank for terminal quality assurance during radiotherapy, comprising: a water tank assembly, a three-dimensional scanning mechanism and an angle adjustment mechanism. The water tank assembly comprises a tank body and a tank cover, a side incident window is provided on the tank body, and an upper incident window is provided on the tank cover. The three-dimensional scanning mechanism is arranged inside the water tank assembly, driving the probe to move inside the tank body to achieve three-dimensional scanning; the angle adjustment mechanism is arranged outside the water tank assembly, capable of adjusting the angle of the water tank assembly so that the beam ray can be irradiated into the water tank assembly to be detected by the probe. The use of a sealed structure with a built-in waterproof motor meets the requirements for placing the water tank body at different angles. The water tank adopts an electrically driven movable hinge adjustment mechanism, which can automatically adjust the irradiation angle.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a sealed water tank used for terminal QA (Quality Assurance) during radiotherapy. Background Art

[0002] At present, water tanks used for radiotherapy use sensor probes such as ionization chambers to complete ion beam detection at different positions and depths in the water tank to simulate the internal structure of the human body and provide beam doses at different positions and depths, thereby accurately guiding treatment plans.

[0003] Existing water tanks are only suitable for beam terminations for traditional fixed-angle irradiation, and all are open-top structures. The sidewalls of the water tanks are equipped with either a horizontal entrance window or a 45° entrance window positioned at a 45° angle to the horizontal. The motor is located outside the tank, making it unsuitable for placement at various angles. These tanks can only accommodate horizontal, vertical, and 45° irradiation, failing to meet the multi-directional beam measurement requirements of the new ion beam rotating gantry (Gantry) treatment process, severely restricting treatment planning during Gantry treatments.

[0004] In order to solve the problem that the existing water tank cannot meet the beam measurement requirements during multi-angle treatment, it is necessary to develop a sealed water tank for ion beam radiotherapy, so that the water tank can automatically adjust the irradiation angle. The device has a compact structure and high working efficiency. In addition to meeting the traditional treatment angle requirements, it can also meet the beam detection requirements for multi-directional irradiation in Gantry treatment. Summary of the Invention

[0005] In response to the above problems, the purpose of this application is to provide a sealed water tank for terminal quality assurance during radiotherapy. Its three-dimensional scanning mechanism can conveniently and accurately scan and measure the dose distribution parameters of the ion beam radiation field, and the water tank placement angle can be automatically adjusted to meet the beam detection requirements in multi-directional irradiation in Gantry treatment.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] A sealed water tank for terminal QA during radiotherapy, comprising:

[0008] The water tank assembly includes a tank body and a tank cover, the tank body is provided with a side incident window, and the tank cover is provided with an upper incident window;

[0009] A three-dimensional scanning mechanism is provided in the water tank assembly. A probe is provided on the three-dimensional scanning mechanism. The three-dimensional scanning mechanism drives the probe to move within the tank to achieve three-dimensional scanning.

[0010] An angle adjustment mechanism is arranged outside the water tank assembly, and the angle adjustment mechanism is suitable for adjusting the angle of the water tank assembly so that the beam rays from the radiotherapy equipment can irradiate into the water tank assembly to be detected by the probe.

[0011] The box body and the box cover form a sealed space, and a valve is provided on the box body for filling water into the sealed space.

[0012] A sealing assembly is provided on the box body so that the cables for the 3D scanning mechanism can be extended from the inside of the box body in a sealed manner. The sealing assembly includes:

[0013] Multiple gaskets, the cables pass through the inner holes of the multiple gaskets, and gaps are set between the inner holes of the multiple gaskets and the cables;

[0014] Multiple rubber rings, multiple gaskets and multiple rubber rings are staggered and stacked;

[0015] The pressing plate is arranged on the outside of the plurality of gaskets. When the pressing plate squeezes the plurality of gaskets, the plurality of rubber rings extend into the gaps arranged between the inner holes of the plurality of gaskets and the cables to wrap the cables.

[0016] The side incident window is detachably arranged on the box body in a rubber sealing manner, and the upper incident window is detachably arranged on the box cover in a rubber sealing manner.

[0017] The 3D scanning mechanism includes:

[0018] An X-direction driving member extending in the X-direction and fixed on the inner side panel of the water tank body in the X-direction;

[0019] a bottom guide member extending in the X direction and spaced apart from the X-direction driving member in the Z direction;

[0020] A Z-direction driving member, the Z-direction driving member extends in the Z direction, the upper end of the Z-direction driving member is connected to the X-direction driving member, the lower end of the Z-direction driving member is connected to the bottom guide member, and the Z-direction driving member is capable of moving along the X direction;

[0021] A Y-direction driving member, the Y-direction driving member extends in the Y direction, the Y-direction driving member moves along the Z direction under the drive of the slider of the Z-direction driving member, and can move along the Y direction under the drive of the driving mechanism;

[0022] The X direction, the Y direction, and the Z direction are perpendicular to each other.

[0023] The driving mechanism includes:

[0024] A rotating rod extending in the Z direction;

[0025] A gear box is provided with a first bevel gear and a second bevel gear. The second bevel gear is sleeved on a rotating rod. The rotation of the rotating rod drives the second bevel gear to rotate. The rotation of the second bevel gear drives the first bevel gear to rotate. The rotation of the first bevel gear drives the Y-direction driving member to move along the Y direction.

[0026] The angle adjustment mechanism includes:

[0027] a connecting plate connected to the bottom of the water tank assembly;

[0028] A bottom support plate is provided below the connecting plate;

[0029] A fixed hinge, wherein the lower end of the fixed hinge is fixedly connected to the bottom support plate, and the upper end of the fixed hinge is hinged to the connecting plate;

[0030] a movable hinge connected between the connecting plate and the bottom support plate, wherein the movable hinge is configured to change the angle of the connecting plate relative to the bottom support plate by changing its positional relationship;

[0031] A drive assembly and a drive motor, wherein the drive motor drives the movable hinge to change its positional relationship through the drive assembly;

[0032] Therefore, when the incident angle is less than 45 degrees, the driving component drives the water tank component to shift the angle so that the side incident window angle changes from horizontal 0 degrees to 45 degrees. When the incident angle is greater than 45 degrees, the beam rays are selected to be incident from the upper incident window.

[0033] The beam parameters of the irradiation field and depth of the beam rays entering through the side incident window or the upper incident window in water are recorded by the probe.

[0034] The three-dimensional scanning mechanism scans the dose distribution of the beam in water to obtain at least one dose distribution parameter selected from the group consisting of beam half-height width, penumbra, symmetry, flatness, and maximum dose point depth.

[0035] Due to the adoption of the above technical solution, this application has the following advantages:

[0036] The present application provides a sealed water tank for terminal QA during radiotherapy, which adopts a sealed structure with a built-in waterproof motor to meet the requirements of placing the water tank body at different angles.

[0037] The water tank automatically adjusts the irradiation angle using an electrically driven movable hinge adjustment mechanism. The device is compact and efficient, meeting not only the traditional treatment angle requirements but also the beam detection requirements for multi-directional irradiation in Gantry treatments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0039] Figure 1 It is a schematic diagram of the sealed water tank in a horizontal state;

[0040] Figure 2 It is a schematic diagram of the sealed water tank at 40°;

[0041] Figure 3 It is a partial cross-sectional view of the sealed water tank;

[0042] Figure 4 It is a partial cross-sectional view of the sealed water tank with the cover removed;

[0043] Figure 5 It is an overall cross-sectional view of the sealed water tank;

[0044] Figure 6 is a cross-sectional view of a sealing assembly for sealing a cable of a water tank;

[0045] Figure 7 It is a schematic diagram of the 3D scanning assembly of the sealed water tank;

[0046] Figure 8 It is a partial cross-sectional view of the gearbox of the 3D scanning assembly of the sealed water tank;

[0047] Figure 9 It is a cross-sectional view of the gearbox of the 3D scanning assembly of the sealed water tank;

[0048] The symbols in the accompanying drawings represent the following:

[0049] 1 Water tank assembly

[0050] 2 3D scanning mechanism

[0051] 3 Angle adjustment mechanism

[0052] 4 Probes

[0053] 11 Cabinet

[0054] 12. Box cover

[0055] 13 Side incident window

[0056] 14 valves

[0057] 15 Upper entrance window

[0058] 16 Sealing assembly

[0059] 21 X-axis drive element

[0060] 22 Z-direction drive element

[0061] 23 Y-axis driving part

[0062] 24 Bottom guide

[0063] 25 waterproof motor

[0064] 26 Probe tooling

[0065] 31 Motor

[0066] 32 support plate

[0067] 33 connecting plate

[0068] 34 fixed hinge

[0069] 35 Living Hinge

[0070] 36 drive components

[0071] 37 cables

[0072] 161 gasket

[0073] 162 rubber ring

[0074] 163 pressure plate

[0075] 222 Rotating Rod

[0076] 231 Gearbox

[0077] 2311 First bevel gear

[0078] 2312 Second bevel gear DETAILED DESCRIPTION

[0079] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0080] In the 21st century, with the rapid development of nuclear science and accelerator technology, the application of ion beam radiation in the mutation breeding of plants and microorganisms and particle beam cancer treatment is becoming increasingly widespread.

[0081] Particle beam radiotherapy for tumors is one of the primary methods and approaches for treating and controlling tumors. Proton and heavy ion therapy is an advanced technology in radiotherapy, utilizing proton and heavy ion radiation to treat tumors and is currently a highly effective radiotherapy procedure. Compared to traditional radiotherapy, proton and heavy ion therapy represents the highest level of technology and future trends in radiotherapy. Currently, major hospitals are investing in large-scale medical equipment for tumor radiotherapy, such as medical heavy ion accelerators and proton linear accelerators.

[0082] To ensure accurate, planned treatment for patients, thereby improving tumor cure and control rates, beam radiation requires clinical measurement, requiring a surrogate that closely resembles human tissue. Currently, the most widely used 3D water tank for clinical radiation measurement worldwide simulates human tissue for testing, playing a crucial role in radiotherapy.

[0083] In recent years, with the increasing demand for accelerators in radiotherapy, the demand for multi-angle and multi-directional adjustable radiotherapy has increased. In radiotherapy, the Rotating Gantry, which can provide beam radiation at any angle, is the most ideal ion beam therapy terminal delivery system for conformal therapy. To this end, the Rotating Gantry treatment system has been vigorously developed.

[0084] The Ion Beam Rotation Gantry is a cancer accelerator terminal delivery system that utilizes a pencil ion beam to treat tumors. During treatment, it can rotate from 0° to 180° or 0° to 360°, effectively delivering multi-directional tumor treatment while mitigating radiation damage to normal tissues and organs. Since RR Wilson proposed proton beam therapy for tumors in 1946, developed countries have built dedicated ion accelerators designed to provide variable-energy, finely tuned ion beams for conformal treatment of lesions.

[0085] End-to-end QA stands for Quality Assurance. Quality assurance refers to a series of carefully planned systems or regulations that ensure that every step of the entire radiotherapy service process is accurately and safely executed to certain standards.

[0086] Example 1:

[0087] According to an embodiment of the present application, a sealed water tank for terminal QA during radiotherapy includes a water tank assembly, a three-dimensional scanning mechanism, a bottom angle adjustment mechanism, a scanning probe, and the like. A three-dimensional scanning mechanism is provided inside the water tank assembly, and the three-dimensional scanning mechanism drives the scanning probe to move inside the tank. The water tank assembly is provided above the bottom angle adjustment mechanism, and the angle adjustment mechanism can freely adjust the angle of the incident window of the water tank under the drive of the motor. The water tank assembly includes a tank body and a tank cover. The tank body and the tank cover are respectively provided with a detachable incident window, and the inside of the tank body is filled with water; the three-dimensional scanning mechanism is composed of three groups of drives, which can drive the probe to realize three-dimensional scanning in water; the bottom angle adjustment mechanism is driven by the motor, and the angle is continuously adjustable, so that the incident window of the water tank can meet irradiation at different angles.

[0088] A three-dimensional scanning mechanism is installed inside the box body of the water tank mechanism, and a beam incident window is provided on the side of the box body. The bottom of the box body is connected to the connecting plate of the angle adjustment mechanism, and two valves are provided on the side of the box body for filling and draining water. The side panel is provided with a sealing hole for the signal line or the motor power line to pass through the wall to ensure that the cables are transmitted from the inside of the box body without leaking. The box cover is also provided with an incident window, which is a pressure plate of PMMA sheet (PMMA is the abbreviation of polymethyl methacrylate poly (methylmethacrylate)), and is connected to the box cover with a rubber seal. There is a detachable rubber seal between the box body and the box cover. When the probe inside needs to be replaced, open the upper cover for replacement and then reseal the connection. The outside of the incident window is provided with a scale line to facilitate the use of laser for alignment.

[0089] The angle adjustment mechanism consists of a bottom support plate, a connecting plate, a fixed hinge, a movable hinge, a driving assembly and a driving motor.

[0090] The bottom support plate is used to mount the fixed hinge, movable hinge, and drive assembly. The connecting plate is connected to the bottom support plate via the movable and fixed hinges. The water tank assembly is mounted on top of the connecting plate. The connecting plate is connected to the bottom of the water tank via threads. The threads on the entire water tank body are threaded sleeves mounted inside the plexiglass panel, which effectively improve the strength and service life of the connection.

[0091] The bottom support plate can place the entire structure with the water tank installed on an existing three-dimensional treatment bed or a three-dimensional adjustment platform to support the entire water tank. Driven by the drive motor, the slider of the drive assembly of the bottom angle adjustment mechanism moves back and forth, driving the long drive rod to push the movable hinge; the position of the movable hinge changes continuously, and the pitch angle of the connecting plate changes, driving the entire water tank assembly to shift the angle, achieving adjustment of the incident window angle. The angle varies from horizontal 0 degrees to 45 degrees. When the incident angle is required to be greater than 45 degrees, the corresponding incident window is selected as the upper incident window. At the same time, the ionization chamber fixing fixture is installed horizontally so that the ionization chamber receiving surface is parallel to the upper incident window.

[0092] The power and signal cables for the motor, ionization chamber, and other equipment inside the tank are routed through a sealing assembly on the sidewall. The sealing assembly consists of a multi-layered gasket holding a rubber ring. The rubber ring, squeezed by a pressure plate, tightly wraps around the cables, guiding them out of the tank.

[0093] The three-dimensional scanning mechanism includes three-directional driving members and a waterproof motor. The driving members include an X-direction driving member 21, a Y-direction driving member 23, a Z-direction driving member 22 and a bottom guide member 24. The X-direction driving member 21 is horizontally fixed inside the side panel, and a second driving member (Z-direction driving member 22) is provided on the slider of the X-direction driving member 21. Driven by the motor, the slider of the X-direction driving member 21 moves back and forth, driving the Z-direction driving member 22 as a whole to move forward and backward along the X-direction. The upper end of the Z-direction driving member 22 is fixedly connected to the slider seat of the X-direction driving member 21, and the lower end of the Z-direction driving member 22 is connected to the slider of the bottom guide member 24, and the bottom guide member 24 is parallel to the X-direction driving member 21. In this way, the positional accuracy of the Z-direction driving member 22 and the Y-direction driving member 23 can be fully guaranteed.

[0094] Driven by the motor of the Z-drive member 22, the slider of the Z-drive member 22 moves up and down, causing the third drive member (Y-drive member 23) fixed to the slider of the Z-drive member 22 to move up and down as a whole. Driven by the motor of the Y-drive member 23, the rotating rod 222 rotates, causing the bevel gear mounted on the rotating rod 222 to rotate. At this time, the meshing of a pair of bevel gears arranged in the gear box 231 drives the lead screw of the Y-drive member 23 to rotate, thereby driving the slider of the Y-drive member 23 to move under the action of the guide. The slider of the Y-drive member 23 is mounted with a probe fixture 26, and the probe 4 is mounted within the probe fixture 26. The probe 4 can be a detector such as a flat-panel ionization chamber or a finger-type ionization chamber. Under the comprehensive drive of the three-dimensional scanning mechanism, the slider of the Y-drive member 23 can drive the probe 4 to perform three-dimensional position scanning in water. The beam entering through the incident window is recorded, including beam parameters such as different irradiation fields and depths in water.

[0095] Two bevel gears that mesh vertically with each other are provided in the gearbox 231. The bevel gears are connected to the gearbox body through bearings inside the gearbox. The first bevel gear is connected to the lead screw of the Y-axis drive member, and the second bevel gear is sleeved on the rotating rod. The rotating rod is connected to the third motor and is provided on the back of the second drive Z-axis drive member. A sliding key is provided inside the bevel gear inside the gearbox, and the sliding key cooperates with the slide groove of the rotating rod; when the slider of the Z-axis drive moves up and down, it drives the Y-axis drive member and the gearbox fixed on the slider to move up and down as a whole, and the second bevel gear slides up and down relative to the rotating rod. When the third motor drives the rotating rod to rotate, the rotating rod drives the second gear to rotate; under the fitting of the gears, the first gear rotates to drive the Y-axis lead screw to rotate and drive the Y-axis slider to move.

[0096] In order to ensure the accuracy of the driving structure, the driving components and fixing plates of the 3D scanning mechanism are made of metal with good rigidity and light weight. The special-shaped hole structure of the fixing plate greatly reduces the weight while ensuring rigidity.

[0097] The complete water tank also includes various types of ionization chamber probes, computers and corresponding control systems and software.

[0098] Example 2:

[0099] According to one embodiment of the present application, a sealed water tank for terminal QA during radiotherapy is provided, which mainly includes a water tank assembly, a bottom angle adjustment mechanism, a three-dimensional scanning mechanism, a scanning probe, etc. A three-dimensional scanning mechanism is provided inside the water tank assembly, and the three-dimensional scanning mechanism drives the scanning probe to move inside the box. The water tank assembly is provided with a bottom angle adjustment mechanism, and the angle adjustment mechanism can freely adjust the angle of the incident window of the water tank under the drive of a motor. The water tank can automatically adjust the irradiation angle. The device has a compact structure and high working efficiency. In addition to meeting the requirements of traditional fixed treatment angles, it can also meet the beam detection requirements for multi-directional irradiation in Gantry treatment.

[0100] Figure 1 、 Figure 2 、 Figure 3 A schematic diagram showing two different angle states of a sealed water tank for radiotherapy according to an embodiment of the present application is shown. The sealed water tank mainly includes: a water tank assembly 1, a three-dimensional scanning mechanism 2, an angle adjustment mechanism 3, and a probe 4.

[0101] The water tank assembly 1 comprises a tank body 11 and a tank cover 12. The tank body 11 and the tank cover 12 are respectively provided with a detachable side incident window 13 and an upper incident window 15. The interior of the tank body 11 is filled with water.

[0102] The three-dimensional scanning mechanism 2 disposed inside the water tank assembly 1 drives the scanning probe 4 to move inside the tank body 11 .

[0103] Figure 1It is a schematic diagram of the sealed water tank in a horizontal state.

[0104] When in a horizontal position, the water tank can be used for horizontal and vertical irradiation. When irradiating horizontally, it is irradiated from the side incident window 13; when irradiating vertically, it is irradiated from the upper incident window 15. The upper cover can also be opened to irradiate directly from the upper end opening like an existing water tank.

[0105] Figure 2 It is a schematic diagram of the sealed water tank at 40°.

[0106] Irradiation depends on the beam's incident angle. When the beam's incident angle is less than 45°, illumination is achieved through the side incident window 13. When the beam's incident angle is greater than 45°, such as angle a, illumination is achieved through the upper incident window 15. In this case, the angle between the bottom of the housing 11 and the horizontal plane needs to be adjusted, for example, to 90-a degrees. For example, when the incident angle is 70 degrees, the adjustment mechanism can be set to 20 degrees.

[0107] Figure 3 This is a partial cross-sectional view of the sealed water tank. Figure 4 It is a partial cross-sectional view of a sealed water tank with the lid removed. The three-dimensional scanning mechanism 2 is composed of three sets of drives, which can drive the probe 4 to perform three-dimensional scanning in the water; the bottom angle adjustment mechanism 3 is driven by the motor 31 and the overall angle of the water tank can be continuously adjusted, so that the incident window of the water tank 1 can meet the irradiation requirements of different angles.

[0108] A three-dimensional scanning mechanism 2 is installed inside the box body 11 of the water tank assembly 1. A beam incident window 13 is provided on the side of the box body 11. The bottom of the box body 11 is connected to the connecting plate 33 of the angle adjustment mechanism. Two valves 14 are provided on the side of the box body 11 for filling and draining water. A sealing assembly 16 for signal lines or motor power lines to pass through the wall is provided on the side panel to ensure that the cables are transmitted from the inside of the box body 11 and at the same time ensure that the box body 11 is watertight. An incident window 15 is also provided on the box cover 12. The incident window 15 is a pressure plate of PMMA sheet material and is connected to the box cover by rubber sealing. The box body 11 and the box cover 12 are also sealed with a detachable rubber seal. When the probe 4 inside needs to be replaced, the upper cover is opened for replacement and then the connection is resealed. The outside of the incident window is provided with engraved lines to facilitate alignment using laser.

[0109] Figure 5 This is the overall cross-sectional view of the sealed water tank. Figure 5 As shown, the angle adjustment mechanism 3 includes a drive motor 31 , a bottom support plate 32 , a connecting plate 33 , a fixed hinge 34 , a movable hinge 35 and a drive assembly 36 .

[0110] The bottom support plate 32 is used to mount the fixed hinge 34, movable hinge 35, and drive assembly 36. The connecting plate 33 is connected to the bottom support plate 32 via the fixed hinge 34 and movable hinge 35. The water tank assembly 1 is mounted on top of the connecting plate 33. The connecting plate 33 is connected to the bottom of the tank body 11 via threads. The threads on the entire water tank body 11 are threaded sleeves that fit inside the plexiglass panel. The metal threaded sleeves effectively increase the strength and service life of the connection.

[0111] The bottom support plate 32 can place the entire structure with the water tank 1 installed on an existing three-dimensional treatment bed or a three-dimensional adjustment platform to support the entire water tank. The movable hinge 35 of the bottom angle adjustment mechanism 3 is composed of three connecting rods and a fixed seat. Bearings are provided between the connecting rods and between the connecting rods and the fixed seat to effectively ensure connection accuracy and rotation flexibility. The drive assembly 36 is an assembly composed of a slider, a screw and a guide rail. Driven by the drive motor 31, the slider of the drive assembly 36 moves back and forth to push the long drive rod of the movable hinge 35, so that the positional relationship of the entire movable hinge 35 changes, driving the angle of the connecting plate 33 relative to the bottom support plate 32 to change. The pitch angle of the connecting plate can be changed within the range of 0-45°, driving the entire water tank assembly 1 to shift in angle and adjust the angle of the incident window. When the incident angle is required to be greater than 45 degrees, the corresponding incident window is selected as the upper incident window. At the same time, the ionization chamber fixing fixture is installed horizontally relative to the bottom above the slider of the Y-direction driving member 33, so that the ionization chamber beam incident receiving surface is parallel to the upper incident window.

[0112] Figure 6 This is a cross-sectional view of the sealing assembly of the cable that seals the water tank. Figure 6 As shown, the power supply cables and signal cables for the motor, ionization chamber, and other equipment installed inside the tank are led out through the sealing assembly 16 on the side wall of the tank. The sealing assembly 16 is a structure in which a multi-layer gasket 161 clamps a rubber ring 162. Under the pressure of the pressure plate 163, the rubber ring 162 tightly wraps the cable 37. The gasket can be a metal gasket. A certain amount of gap is left between the inner hole of the metal gasket 161 and the cable 37. This gap can ensure that the rubber gasket has room to expand after being squeezed and stressed, effectively ensuring that the rubber ring 162 wraps around the cable 37, providing a good sealing effect. The sealing assembly 16 can lead various cables out of the water tank.

[0113] Figure 7: This is a schematic diagram of the three-dimensional scanning assembly of a sealed water tank. The three-dimensional scanning mechanism 2 includes three-directional drive components and a waterproof motor 25. The drive components include an X-axis drive component 21, a Y-axis drive component 23, a Z-axis drive component 22, and a bottom guide component 24. The X-axis drive component 21 is horizontally fixed inside the side panel of the box body 11. The moving slider of the X-axis drive component 21 is provided with a second drive, namely the Z-axis drive component 22. Driven by the motor 25, the X-axis drive component 21 moves back and forth, driving the Z-axis drive component 23 as a whole to move in the forward and reverse directions along the X direction. The upper end of the Z-axis drive component 22 is fixedly connected to the slider seat of the X-axis drive component 21, and the lower end of 22 is connected to the slider of the bottom guide component 24. The bottom guide component 24 is parallel to the X-axis drive component 21. In this way, the verticality of the Z-axis drive component 22 and the Y-axis drive component 23 can be fully guaranteed, thereby ensuring the positioning accuracy of the probe.

[0114] When the motor 25 of the Z-axis drive 22 drives the slider of the Z-axis drive 22 up and down, the third drive member, the Y-axis drive 23, fixed to the slider of the Z-axis drive 22, moves up and down as a whole. When the Y-axis motor drives the rotating rod 222 to rotate, the second bevel gear mounted on the rotating rod rotates. At this time, a pair of bevel gears in the gearbox 231 engage, with the first bevel gear connected to the leadscrew of the Y-axis drive 23, driving the leadscrew of the Y-axis drive 23 to rotate, thereby driving the slider of the Y-axis drive 23 to move under the guidance of the guide. The movable slider of the Y-axis drive 23 is mounted with a probe fixing fixture 26, which houses a probe 4, such as a flat-plate ionization chamber or a finger-type ionization chamber. The integrated drive of the three directions enables the Y-axis slide to drive the probe 4 to scan the three-dimensional position in water. The beam parameters of the beam entering through the entrance window are recorded at different irradiation fields and depths in water.

[0115] Figure 8 It is a partial cross-sectional view of the gearbox of the 3D scanning assembly of the sealed water tank; Figure 9 This is a cross-sectional view of the gearbox of the 3D scanning component of the sealed water tank. Figure 8 and 9As shown, the gear box 231 is provided with a first bevel gear 2311 and a second bevel gear 2312 that mesh vertically with each other. The first bevel gear 2311 and the second bevel gear 2312 are connected to the housing 11 through bearings in the gear box 231. The first bevel gear 2311 is connected to the lead screw of the Y-axis driving member, and the second bevel gear 2312 is sleeved on the rotating rod 222. The rotating rod 222 is connected to the third motor and is arranged on the back of the Z-axis driving member 22. A sliding key is provided inside the first bevel gear 2311 provided in the gear box 231, and the sliding key cooperates with the sliding groove of the rotating rod 222. When the slider of the Z-axis driving member 22 moves up and down, it drives the Y-axis driving member 22 fixed on the slider and the gear box 231 to move up and down as a whole, and the second bevel gear 2312 provided in the gear box 231 slides up and down relative to the rotating rod 222. When the third motor drives the rotating rod 222 to rotate, the rotating rod 222 drives the second bevel gear 2312 to rotate. Under the fitting of the gears, the first bevel gear 2311 rotates to drive the lead screw of the Y-direction driving member 23 to rotate, and drives the slider of the Y-direction driving member 23 to move.

[0116] To ensure the accuracy of the drive structure, the drive components and the fixing plate of the 3D scanning mechanism 2 are made of metal with good rigidity and light weight. The special-shaped hole structure of the fixing plate greatly reduces the weight while ensuring rigidity.

[0117] In some embodiments, the present invention further includes a three-dimensional water tank motion control system and a data acquisition system, wherein the probe portion includes a flat-plate ionization chamber or a finger-type ionization chamber, both of which are readily available standard products. The water tank, including the three-dimensional water tank motion control system and the data acquisition system, can automatically and rapidly scan the relative dose distribution of radiation in water, such as beam half-height width, penumbra, symmetry, flatness, and maximum dose point depth, and provide corresponding results.

[0118] Example 3:

[0119] According to an embodiment of the present application, a sealed water tank for terminal QA during radiotherapy includes:

[0120] The water tank assembly 1 includes a tank body 11 and a tank cover 12. The tank body 11 is provided with a side incident window 13, and the tank cover 12 is provided with an upper incident window 15.

[0121] The three-dimensional scanning mechanism 2 is disposed in the water tank assembly 1 and drives the probe 4 to move in the tank body 11 to achieve three-dimensional scanning;

[0122] Angle adjustment mechanism 3 , which is arranged outside the water tank assembly 1 , can adjust the angle of the water tank assembly 1 so that the beam ray can be irradiated into the water tank assembly 1 to be detected by the probe 4 .

[0123] The box body 11 and the box cover 12 form a sealed space. A valve 14 is provided on the box body 11 for filling water into the sealed space.

[0124] A sealing assembly 16 is provided on the box body 11 so that the cable 37 for the three-dimensional scanning mechanism can extend from the inside of the box body 11 without leaking.

[0125] The sealing assembly 16 comprises:

[0126] Multiple gaskets 161, cables 37 pass through the inner holes of the multiple gaskets 161, and gaps are set between the inner holes of the multiple gaskets 161 and the cables 37;

[0127] A plurality of rubber rings 162, a plurality of gaskets 161 and a plurality of rubber rings 162 are alternately stacked;

[0128] The pressure plate 163 is arranged on the outside of the multiple gaskets 161. When the pressure plate 163 squeezes the multiple gaskets 161, the multiple rubber rings 162 extend into the gaps set between the inner holes of the multiple gaskets 161 and the cables 37 to wrap the cables 37.

[0129] The side incident window 13 is detachably provided on the box body 11 in a rubber-sealed manner, and the upper incident window 15 is detachably provided on the box cover 12 in a rubber-sealed manner.

[0130] The three-dimensional scanning mechanism 2 includes:

[0131] An X-direction driving member 21, the X-direction driving member 21 extends in the X-direction and is fixed on the inner side panel of the box body 11 of the water tank assembly 1 in the X-direction;

[0132] A bottom guide member 24 extending in the X direction and spaced apart from the X-direction driving member 21 in the Z direction;

[0133] A Z-direction driving member 22 extends in the Z direction, an upper end of the Z-direction driving member 22 is connected to the X-direction driving member 21, and a lower end of the Z-direction driving member 22 is connected to the bottom guide member 24, so that the Z-direction driving member 22 can move along the X direction;

[0134] The Y-direction driving member 23 extends in the Y direction. The Y-direction driving member 23 moves along the Z direction driven by the slider of the Z-direction driving member 22 and can move along the Y direction driven by the driving mechanism.

[0135] The X direction, the Y direction, and the Z direction are perpendicular to each other.

[0136] The driving mechanism includes:

[0137] A rotating rod 222 extending in the Z direction;

[0138] The gear box 232 includes a first bevel gear 2311 and a second bevel gear 2312. The second bevel gear 2312 is sleeved on the rotating rod 222. The rotation of the rotating rod 222 drives the second bevel gear 2312 to rotate. The rotation of the second bevel gear 2312 drives the first bevel gear 2311 to rotate. The rotation of the first bevel gear 2311 drives the Y-direction driving member to move along the Y direction.

[0139] The angle adjustment mechanism 3 includes:

[0140] A connecting plate 33 connected to the bottom of the water tank assembly 1;

[0141] The bottom support plate 32 is provided below the connecting plate 33;

[0142] A fixed hinge 34 , wherein the lower end of the fixed hinge 34 is fixedly connected to the bottom support plate 32 , and the upper end of the fixed hinge 34 is hinged to the connecting plate 33 ;

[0143] a movable hinge 35 connected between the connecting plate 33 and the bottom support plate 32, wherein the movable hinge 35 is configured to change the angle of the connecting plate 33 relative to the bottom support plate 32 by changing its positional relationship;

[0144] The driving assembly 36 and the driving motor 31 , wherein the driving motor 31 drives the movable hinge 35 to change its positional relationship through the driving assembly 36 ;

[0145] When the incident angle is less than 45 degrees, the driving component 36 drives the water tank component 1 to shift the angle so that the angle of the side incident window 13 changes from horizontal 0 degrees to 45 degrees. When the incident angle is greater than 45 degrees, the beam rays are selected to be incident from the upper incident window 15.

[0146] The beam parameters of the irradiation field and depth of the beam rays entering through the side incident window 13 or the upper incident window 15 in water are recorded by the probe 4 .

[0147] The three-dimensional scanning mechanism 2 scans the dose distribution of the beam in water to obtain at least one dose distribution parameter selected from the group consisting of beam half-height width, penumbra, symmetry, flatness, and maximum dose point depth.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealed water tank for terminal quality assurance during radiotherapy, characterized in that: include: A water tank assembly, comprising a tank body and a tank cover, wherein the tank body is provided with a side incident window, and the tank cover is provided with an upper incident window; a three-dimensional scanning mechanism, the three-dimensional scanning mechanism being arranged in the water tank assembly, the three-dimensional scanning mechanism being provided with a probe, the three-dimensional scanning mechanism driving the probe to move within the tank body to achieve three-dimensional scanning, the three-dimensional scanning mechanism comprising: an X-direction driving member extending in the X direction and being fixed to the inner side plate of the tank body in the X direction; a bottom guide member extending in the X direction and being spaced apart from the X-direction driving member in the Z direction; a Z-direction driving member extending in the Z direction, the upper end of the Z-direction driving member being connected to the X-direction driving member, the lower end of the Z-direction driving member being connected to the bottom guide, the Z-direction driving member being capable of moving along the X direction; and a Y-direction driving member extending in the Y direction, the Y-direction driving member being driven by a slider of the Z-direction driving member to move in the Z direction, and being capable of moving in the Y direction under the drive mechanism; wherein the X direction, the Y direction, and the Z direction are perpendicular to each other; An angle adjustment mechanism is provided outside the water tank assembly and is adapted to adjust the angle of the water tank assembly so that beam rays from the radiotherapy device can enter the water tank assembly for detection by the probe. The angle adjustment mechanism includes: a connecting plate connected to the bottom of the water tank assembly; A bottom support plate, arranged below the connecting plate; A fixed hinge, wherein the lower end of the fixed hinge is fixedly connected to the bottom support plate, and the upper end of the fixed hinge is hinged to the connecting plate; a movable hinge connected between the connecting plate and the bottom support plate, wherein the movable hinge is configured to change the angle of the connecting plate relative to the bottom support plate by changing its positional relationship; A drive assembly and a drive motor, wherein the drive motor drives the movable hinge to change its positional relationship through the drive assembly; The pitch angle of the connecting plate changes within the range of 0-45 degrees, driving the entire water tank assembly to shift its angle, thereby adjusting the angle of the incident window. When the incident angle is required to be greater than 45 degrees, the corresponding incident window is selected as the upper incident window. At the same time, the ionization chamber fixing tool is horizontally installed above the slider of the Y-direction drive member relative to the bottom, so that the ionization chamber beam incident receiving surface is parallel to the upper incident window. Therefore, when the incident angle is less than 45 degrees, the drive assembly drives the water tank assembly to shift its angle to achieve a change in the side incident window angle from 0 degrees to 45 degrees from the horizontal. When the incident angle is greater than 45 degrees, the beam rays are selected to be incident from the upper incident window. The beam parameters of the irradiation field and depth in water of the beam rays entering through the side incident window or the upper incident window are recorded by the probe; The three-dimensional scanning mechanism scans the dose distribution of the beam in water to obtain at least one dose distribution parameter selected from the group consisting of beam half-height width, penumbra, symmetry, flatness, and maximum dose point depth.

2. The sealed water tank for terminal quality assurance during radiotherapy according to claim 1, characterized in that: The box body and the box cover enclose a sealed space, and a valve is provided on the box body for filling water into the sealed space.

3. The sealed water tank for terminal quality assurance during radiotherapy according to claim 2, characterized in that: A sealing assembly is provided on the box body so that the cables for the three-dimensional scanning mechanism can be extended from the inside of the box body in a sealed manner. The sealing assembly includes: a plurality of gaskets, wherein the cables pass through inner holes of the plurality of gaskets, and a gap is provided between the inner holes of the plurality of gaskets and the cables; a plurality of rubber rings, wherein the plurality of gaskets and the plurality of rubber rings are alternately stacked; A pressing plate is arranged on the outside of the plurality of gaskets. When the pressing plate squeezes the plurality of gaskets, the plurality of rubber rings extend into the gaps between the inner holes of the plurality of gaskets and the cables to wrap the cables.

4. The sealed water tank for terminal quality assurance during radiotherapy according to claim 1, characterized in that: The side incident window is detachably arranged on the box body in a rubber sealing manner, and the upper incident window is detachably arranged on the box cover in a rubber sealing manner.

5. The sealed water tank for terminal quality assurance during radiotherapy according to claim 1, characterized in that: The driving mechanism comprises: A rotating rod extending in the Z direction; A gear box is provided with a first bevel gear and a second bevel gear, the second bevel gear is sleeved on the rotating rod, the rotation of the rotating rod drives the second bevel gear to rotate, the rotation of the second bevel gear drives the first bevel gear to rotate, and the rotation of the first bevel gear drives the Y-direction driving member to move along the Y direction.

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