WO2022134083A1 - Appareil d'étalonnage pour collimateur multilame et accélérateur annulaire - Google Patents

Appareil d'étalonnage pour collimateur multilame et accélérateur annulaire Download PDF

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Publication number
WO2022134083A1
WO2022134083A1 PCT/CN2020/139659 CN2020139659W WO2022134083A1 WO 2022134083 A1 WO2022134083 A1 WO 2022134083A1 CN 2020139659 W CN2020139659 W CN 2020139659W WO 2022134083 A1 WO2022134083 A1 WO 2022134083A1
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WIPO (PCT)
Prior art keywords
imaging device
portal imaging
calibration
leaf grating
electronic portal
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PCT/CN2020/139659
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English (en)
Chinese (zh)
Inventor
郭召
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西安大医集团股份有限公司
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Priority to PCT/CN2020/139659 priority Critical patent/WO2022134083A1/fr
Publication of WO2022134083A1 publication Critical patent/WO2022134083A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy

Definitions

  • the embodiments of the present application relate to the field of radiotherapy, and in particular, to a multi-leaf grating calibration device and a ring accelerator.
  • Circular accelerators can obtain higher precision and more efficient image acquisition, which is an important development direction of a new generation of medical linear accelerators.
  • Domestic and foreign medical linear accelerator suppliers generally take the ring accelerator as the main research and development direction in the new generation of products.
  • quality assurance is required, especially the calibration of the multi-leaf grating of the treatment head, which is an important basis for ensuring treatment safety and treatment accuracy.
  • the EPID Electronic Portal Imaging Device
  • the image of the field shape formed by the treatment head on the isocenter plane is collected away from the isocenter plane.
  • the imaging accuracy and imaging quality of the field shape are degraded, mainly due to the blurring of the image and the increase of the penumbra. It is necessary to deduce the field shape formed by the treatment head on the isocenter plane through a complex algorithm, and the error is large.
  • the warranty requires that the calibration reference of the multi-leaf grating of the treatment head must be accurate. This makes the EPID of a ring accelerator unusable for accurate calibration of multi-leaf gratings.
  • a water tank is often used to calibrate the multi-leaf grating of the treatment head.
  • the calibration accuracy is high, but the operation is cumbersome, requires high medical personnel, and requires high internal space of the annular accelerator, especially for the annular accelerator with a large field.
  • a larger water tank needs to be placed inside the annular accelerator, and the inner space of the annular accelerator is required to be large enough, usually the diameter needs to reach more than 950mm.
  • one of the technical problems solved by the embodiments of the present application is to provide a multi-leaf grating calibration device and a ring accelerator, which can conveniently and accurately calibrate the multi-leaf grating of the treatment head.
  • a multi-leaf grating calibration device includes: a support body arranged on a rack; a lift mechanism connected to the support body at one end; an electronic portal imaging device connected to the other end of the lift mechanism; the lift mechanism drives the electron beam
  • the field imaging device is raised and lowered, so that the electronic portal imaging device is in different working positions; the working positions include: a calibration state position and a treatment state position.
  • the support body is provided with a groove for accommodating the lifting mechanism; the lifting mechanism is arranged in the groove.
  • the lift mechanism comprises a scissor lift mechanism.
  • the scissor lift mechanism includes: a support plate, a scissor assembly, a first guide rail and a second guide rail; one side of the support plate is provided with the electronic portal imaging device, and the opposite side is provided with the electronic portal imaging device.
  • One side is provided with the first guide rail; one end of the scissor assembly is connected to the first guide rail, and the other end of the scissor assembly is connected to the second guide rail; the scissor assembly is a multi-stage scissor fork assembly; the second guide rail is fixed on the bottom of the groove.
  • the scissor assembly when the electronic portal imaging device is in the calibration state position, the scissor assembly is in an extended state, and the electronic portal imaging device is lifted to an isocenter plane for multi-leaf grating.
  • the scissor assembly When the electronic portal imaging device is in the treatment state position, the scissor assembly is in a compressed state, and the electronic portal imaging device is placed in the groove of the support body.
  • the calibration device further includes: a driving mechanism, the driving mechanism is disposed on the second guide rail and connected to the scissors assembly, for driving the scissors assembly to move upward or descending movement; the drive mechanism is driven by a motor screw.
  • a boss is formed on the inner wall of the groove in the circumferential direction, and when the electron portal imaging device is in a treatment state position, the support plate abuts against the boss.
  • At least one positioning pin is provided on the contact surface of the boss and the support plate, the support plate is provided with a positioning hole corresponding to the at least one positioning pin, and the electron beam field When the imaging device is in the treatment state position, the positioning pin is inserted into the corresponding positioning hole, and the support plate abuts against the boss.
  • a lift guide mechanism is provided between the bottom surface of the groove and the support plate.
  • the calibration apparatus further includes: a position detection device, a main body of the position detection device is disposed in the support body, and a detection end of the position detection device is connected to the electronic portal imaging device , the position detection device is used for detecting the position of the electronic portal imaging device.
  • the connecting wire of the electronic portal imaging device is placed in a drag chain.
  • an auxiliary shielding plate is provided at a position corresponding to the groove on the back of the support body.
  • a ring accelerator includes: the multi-leaf grating calibration device, the treatment head, and the gantry according to the first aspect of the embodiments of the present application; the calibration The device and the treatment head are arranged in the frame; the calibration device is opposite to the treatment head.
  • the multi-leaf grating calibration device provided by the embodiment of the present application includes a support body disposed on a frame; a lifting mechanism connected with one end of the support body; an electronic portal imaging device connected with the other end of the lifting mechanism; The lifting mechanism drives the electronic portal imaging device to ascend and descend, so that the electronic portal imaging device is in different working positions; the working positions include: a calibration state position and a treatment state position.
  • the elevating mechanism drives the electronic portal imaging device to be in a calibrated position
  • the electronic portal imaging device captures an image of the shape of the portal formed by the treatment head on the isocenter plane, and the image can objectively and accurately characterize the treatment head
  • the shape of the field formed on the isocenter plane can truly reflect the quality and accuracy of the shape of the field formed by the treatment head on the isocenter plane, and provide accurate and real data for the calibration of the multi-leaf grating of the treatment head, which can be convenient and accurate.
  • the multi-leaf grating of the treatment head is calibrated, thereby improving the accuracy, reliability and convenience of the multi-leaf grating calibration.
  • FIG. 1 shows a first schematic diagram of the three-dimensional structure of the multi-leaf grating calibration device in the quality assurance mode according to the embodiment of the present application
  • FIG. 2 shows a schematic diagram of a first viewing angle of the multi-leaf grating calibration device in the quality assurance mode according to the embodiment of the present application
  • FIG. 3 is a schematic diagram showing a second viewing angle of the multi-leaf grating calibration device in the quality assurance mode according to the embodiment of the present application;
  • FIG. 4 shows a cross-sectional view of the calibration device of the multi-leaf grating according to the embodiment of the present application from a second viewing angle in a quality assurance mode
  • FIG. 5 shows a cross-sectional view of the calibration device of the multi-leaf grating according to the embodiment of the present application in the second viewing angle in the working mode;
  • FIG. 6 is a schematic diagram showing the positioning of the support plate in the calibration device of the multi-leaf grating according to the embodiment of the present application;
  • FIG. 7 shows a schematic three-dimensional structure diagram of the multi-leaf grating calibration device in the working mode according to the embodiment of the present application
  • Fig. 8 shows the second schematic diagram of the three-dimensional structure of the calibration device of the multi-leaf grating according to the embodiment of the present application in the quality assurance mode
  • FIG. 9 shows a first schematic diagram of an application scenario of a calibration device for a multi-leaf grating according to an embodiment of the present application
  • FIG. 10 shows a second schematic diagram of an application scenario of the multi-leaf grating calibration device according to the embodiment of the present application.
  • Support body 11. Electronic portal imaging device; 12. Imaging area of electronic portal imaging device; 13. Support plate; 14. Boss; 15. Groove; 16. Auxiliary shielding plate; 17. Contact surface; 18, locating pin; 19, first link; 20, second link; 21, third link; 22, fourth link; 23, positioning hole; 24, drive motor; 25, first fixed hinge; 26, the first living hinge; 27, the first guide rail; 28, the second fixed hinge; 29, the second living hinge; 30, the screw rod; 31, the second guide rail; 32, the antenna type lifting column; 34. Treatment head.
  • the accelerator involved in the embodiments of the present application may include a gantry, a treatment couch, a treatment head disposed on the gantry, and a modulator and a control system connected in communication with the treatment head.
  • the treatment head realizes the conversion of electron beams into X-rays under the control of the modulator and the control system, and irradiates the tumor lesion area to kill tumor cells in the tumor lesion area.
  • the rack may be a drum-type rack.
  • the treatment head includes an X-ray generating device and a collimator.
  • the collimator can be a multi-leaf grating, and the multi-leaf grating is used to generate a field that meets the requirements.
  • the field refers to the area and shape of the X-ray irradiation, which defines a range of the ray irradiation.
  • the X-ray generating device may include an electron gun that emits electron beams, an accelerator tube that accelerates the electron beam, a microwave system that provides the accelerator tube with radio frequency power required to establish an acceleration field, and a radiation system that converts the electron beams to X-rays and equalizes the output, etc. .
  • the X-ray emitted by the X-ray generating device is irradiated to the tumor lesion area through the field generated by the multi-leaf grating.
  • the accelerator also includes an electronic portal imaging device arranged on the gantry.
  • the electronic portal imaging device is usually arranged directly opposite the treatment head, that is, the plane where the electronic portal imaging device is located and the axis of the beam emitted by the treatment head vertical.
  • the electronic portal imaging device includes a flat panel circuit and a flat panel effective detection unit communicatively connected with the flat panel circuit, and the electronic portal imaging device is used to perform dose verification and portal verification on the treatment head. For example, before using an accelerator to treat a patient, a treatment plan needs to be developed, and the treatment plan includes at least one irradiation field and a radiation dose corresponding to each irradiation field.
  • the radiation beam emitted by the controlled treatment head is directly irradiated on the electronic portal imaging device, and the electronic portal imaging device can detect the radiation field formed by the radiation beam and the shape of the corresponding radiation field in the treatment plan. Whether it is consistent, that is, the field verification, and respond.
  • the radiation beam emitted by the control treatment head passes through the target area of the patient and then is projected onto the electronic portal imaging device.
  • the electronic portal imaging device can detect the radiation dose and treatment of the radiation beam. Whether the corresponding radiation dose in the plan is consistent, that is, dose verification, and respond.
  • the radiation emitted by the treatment head is conformed by the multi-leaf grating to form the shape of the tumor and irradiate on the tumor area to kill the tumor cells while avoiding irradiating important tissues and organs around the tumor. Therefore, the conformal calibration of the multi-leaf grating is very important. important.
  • the ring accelerator adopts isocenter treatment
  • the electron portal imaging device is arranged far from the isocenter plane of the ring accelerator. Compared with the image formed by the electronic portal imaging device on the isocenter plane, the image quality of the image formed by the electronic portal imaging device is degraded, mainly due to the blurring of the image and the increase of the penumbra.
  • images acquired by the electron portal imaging device at locations far from the isocenter plane cannot be used to accurately calibrate the multi-leaf grating of the treatment head of the ring accelerator.
  • an electronic portal imaging device is required to collect images on the isocenter plane.
  • the image can objectively and accurately represent the shape of the portal formed by the treatment head on the isocenter plane, and can truly reflect the formation of the treatment head on the isocenter plane.
  • the quality and precision of the field shape provide accurate and real data for the calibration of the multi-leaf grating.
  • an embodiment of the present application provides a calibration device for a multi-leaf grating.
  • the elevating mechanism in the calibration device drives the electronic portal imaging device to rise, so that the electronic portal imaging device is in a calibrated position, that is, the electronic portal image.
  • the device is located on the isocenter plane of the annular accelerator, and the electron portal imaging device can collect images of the shape of the portal of the treatment head on the isocenter plane.
  • the multi-leaf grating calibration equipment includes: a support body 10 arranged on the frame 33; a lifting mechanism connected with the support body 10 at one end; an electronic portal imaging device 11 connected with the other end of the lifting mechanism; the lifting mechanism drives the electronic portal image
  • the device 11 is lifted up and down, so that the electronic portal imaging device 11 is in different working positions; the working positions include: a calibration state position and a treatment state position.
  • the electronic portal imaging device collects an image of the shape of the portal formed by the treatment head on the isocenter plane, and the image can objectively and accurately represent the treatment head in the isocenter.
  • the shape of the radiation field formed by the plane can truly reflect the quality and accuracy of the shape of the radiation field formed by the treatment head on the isocenter plane, provide accurate and real data for the calibration of the multi-leaf grating of the treatment head, and can easily and accurately adjust the treatment head.
  • the multi-leaf grating is calibrated, thereby improving the accuracy, reliability and convenience of multi-leaf grating calibration.
  • the rack 33 may be a ring rack, a drum rack, a C-arm rack, a cantilever rack, a semi-arc rack, or a robotic arm rack, or the like.
  • a ring rack is taken as an example for description.
  • the plane where the imaging area 12 of the electronic portal imaging device 11 is located is perpendicular to the axis of the radiation beam emitted by the treatment head 34 , that is, the imaging area 12 of the electronic portal imaging device 11 is facing the radiation beam emitted by the treatment head 34 .
  • the electron portal imaging device 11 is located in a high radiation area.
  • the support body 10 may include a shielding support body for shielding the radiation emitted by the treatment head 34 .
  • the shell of the shielding support body is a steel shell, and the steel shell is filled with lead material to block the radiation emitted by the treatment head 34 .
  • the lifting method of the lifting mechanism includes at least one of the following: scissor lift, telescopic lift of sleeve, pull-out lift, hydraulic lift, pneumatic lift, manual lift, and the like.
  • the warranty mode can be understood as the mode in which the multi-leaf grating calibration equipment of the treatment head calibrates the multi-leaf grating.
  • the electronic portal imaging device 11 can be in the calibration state position to calibrate the multi-leaf grating of the treatment head.
  • the working mode can be understood as the mode in which the calibration equipment of the multi-leaf grating performs dose verification and field verification on the treatment head.
  • the electronic portal imaging device 11 can be in the treatment state position to perform dose verification and portal verification on the treatment head.
  • the support body 10 is provided with a groove 15 for accommodating the lifting mechanism; the lifting mechanism is arranged in the groove 15 .
  • a downwardly concave groove 15 can be provided in the middle of the support body 10 , and the shape of the groove 15 can be square, rectangular, circular, oval, or the like. Thereby, the lifting mechanism can be accommodated through the groove provided on the support body.
  • the lift mechanism comprises a scissor lift mechanism.
  • the scissor lift mechanism can be understood as a mechanism that achieves lift through the expansion and contraction of cross-connected links. In this way, the electronic portal imaging device can be raised and lowered through the scissor lift mechanism, so that the electronic portal imaging device can be raised and lowered to the isocenter plane.
  • the scissor lift mechanism includes: a support plate 13, a scissor assembly, a first guide rail 27 and a second guide rail 31; one side of the support plate 13 is provided with the electronic portal imaging device 11, and the opposite side is provided with the electronic portal imaging device 11. One side is provided with a first guide rail 27; one end of the scissor fork assembly is connected to the first guide rail 27, and the other end of the scissor fork assembly is connected to the second guide rail 31; the scissor fork assembly is a multi-stage scissor fork assembly; Bottom of slot 15.
  • the electron portal imaging device 11 is fixed on the upper surface of the support plate 13 .
  • the first guide rail 27 is provided on the lower surface of the support plate 13 .
  • the support plate 13 is made of tungsten alloy, which can effectively supplement and shield the radiation emitted by the treatment head, and further prevent the radiation emitted by the treatment head from leaking to the external environment and causing harm to the environment.
  • the bottom of the groove 15 can be the bottom surface of the groove 15 which is recessed downward and is provided in the middle of the support body 10 .
  • the multi-stage scissor assembly may be a two-stage scissor assembly.
  • the secondary scissor assembly includes a cross-connected first link 19 and a second link 20, and a cross-connected third link 21 and a fourth link 22; the first end of the first link 19 is fixed by the first link
  • the hinge 25 is rotatably connected with the first guide rail 27, and the first end of the second link 20 is rotatably connected with the first guide rail 27 through the first living hinge 26; the second ends of the first link 19 and the second link 20 are respectively connected with The first ends of the third link 21 and the fourth link 22 are rotatably connected; the second end of the fourth link 22 is rotatably connected to the second guide rail 31 through the second fixed hinge 28 , and the second end of the third link 21 It is rotatably connected with the second guide rail 31 through the second living hinge 29 .
  • the first fixed hinge 25 can be understood as a hinge that cannot move relative to the first guide rail 27
  • the first living hinge 26 can be understood as a hinge that moves relative to the first guide rail 27
  • the second fixed hinge 28 can be understood as a hinge that cannot move relative to the first guide rail 27
  • the hinge for moving the second guide rail 31 , the second living hinge 29 can be understood as a hinge moving relative to the second guide rail 31 .
  • only four links including the cross-connected first link 19 and the second link 20, and the cross-connected third link 21 and the fourth link 22 are used as the two-stage scissor assembly.
  • the multi-stage scissor assembly will be described in detail.
  • this embodiment is not limited thereto, and the multi-stage scissor assembly may be a three-stage scissor assembly, a four-stage scissor assembly, or the like.
  • the first living hinge 26 connected to the first end of the second link 20 is on the first guide rail 27 along the first level.
  • the second living hinge 29 connected with the second end of the third link 21 moves along the first horizontal direction on the second guide rail 31 .
  • the first horizontal direction can be understood as the horizontal movement direction that makes the multi-stage scissors assembly rise, and the first horizontal direction can be horizontal to the left.
  • the second living hinge 29 to which the second end of the rod 21 is connected moves along the second horizontal direction on the second guide rail 31 .
  • the second horizontal direction can be understood as a horizontal movement direction that makes the multi-stage scissor assembly descend
  • the second horizontal direction can be horizontal to the right
  • both the first guide rail 27 and the second guide rail 31 are guide rail pairs.
  • the calibration device further includes: a driving mechanism, the driving mechanism is disposed on the second guide rail 31, connected to the scissors assembly, and used to drive the scissors assembly to perform ascending or descending motion; the driving mechanism is a motor wire rod drive.
  • the driving mechanism includes: a screw rod 30 , which is rotatably connected with the second living hinge 29 ; and a driving motor 24 , which is rotatably connected with the screw rod 30 .
  • the scissor assembly when the electronic portal imaging device 11 is in the calibration state position, the scissor assembly is in an extended state, and the electronic portal imaging device 11 is lifted to the isocenter plane to calibrate the multi-leaf grating;
  • the scissor assembly When the portal imaging device 11 is in the treatment state position, the scissor assembly is in a compressed state, and the electronic portal imaging device 11 is placed in the groove 15 of the support body 10 .
  • the electronic portal imaging device 11 when the electronic portal imaging device 11 is in the calibration state position, the plane where the support plate 13 is located is the isocenter plane, and the electronic portal imaging device 11 collects the image of the portal shape formed by the treatment head 34 on the isocenter plane, so as to Used to calibrate multileaf gratings.
  • the electronic portal imaging device 11 captures an image of the shape of the portal formed by the treatment head 34 on the isocenter plane
  • the image is identified to obtain the actual size of the shape of the portal formed by the treatment head 34 on the isocenter plane.
  • the actual size is compared with the expected size of the field shape formed by the treatment head 34 on the isocenter plane to obtain the deviation data between the actual size and the expected size.
  • the treatment head is 34 multi-leaf gratings for calibration. Specifically, when the electronic portal imaging device 11 is in the treatment state position, the scissor assembly places the electronic portal imaging device 11 in the groove 15 of the support body 10 , and the electronic portal imaging device 11 rotates with the frame 33 .
  • the treatment head 34 performs field verification and dose verification.
  • the drive mechanism receives the calibration signal of the multi-leaf grating, the drive mechanism drives the scissors assembly to move upward, and the scissors assembly drives the electronic portal imaging device 11 to ascend to the circular accelerator.
  • the electronic portal imaging device 11 acquires an image of the shape of the portal formed by the treatment head 34 on the isocenter plane, so as to be used for calibrating the multi-leaf grating.
  • the drive motor 24 receives the calibration signal of the multi-leaf grating, and the drive motor 24 drives the lead screw 30 to rotate along the first direction, and drives the second living hinge 29 to move along the first horizontal direction,
  • the scissors assembly drives the electronic portal imaging device 11 fixed on the support plate 13 to rise to the isocenter plane, and the electronic portal imaging device 11 collects the radiation field formed by the treatment head 34 on the isocenter plane. Shaped image for use in calibrating multileaf gratings.
  • the electronic portal imaging device collects the image of the shape of the field formed by the treatment head on the isocenter plane, which can objectively and accurately represent the shape of the field formed by the treatment head on the isocenter plane, and can truly reflect the shape of the field formed by the ring treatment head.
  • the quality and precision of the field shape formed by the center plane provide accurate and real data for the calibration of the multi-leaf grating, which can easily and accurately calibrate the multi-leaf grating, thereby improving the accuracy, reliability and reliability of the multi-leaf grating calibration. Convenience.
  • the driving mechanism drives the scissors assembly to perform a descending motion
  • the scissors assembly drives the electronic portal imaging device 11 to descend from the isocenter plane to the groove 15 of the support body 10 .
  • the drive motor 24 drives the screw rod 30 to rotate along the second direction, and drives the second living hinge 29 to move along the second horizontal direction, so as to drive the scissor assembly to perform a downward movement
  • the fork assembly drives the electron portal imaging device 11 fixed on the support plate 13 to descend from the isocenter plane to the groove 15 of the support body 10 . In this way, when the electron portal imaging device descends from the isocenter plane into the groove of the support body, the treatment head can be subjected to field verification and dose verification without affecting the treatment space of the annular accelerator.
  • the industrial shape of the ring accelerator is provided with a touch screen or button, and the multi-leaf grating is calibrated by clicking the touch screen or button.
  • the user can click the calibration control on the touch screen, or press the calibration button or the calibration button, and the drive motor 24 can receive the calibration signal of the multi-leaf grating.
  • the electronic portal imaging device 11 rises from the groove 15 of the support body 10 to the isocenter plane, and collects the radiation formed by the treatment head 34 on the isocenter plane.
  • Field-shaped images for use in calibrating the multi-leaf raster of the treatment head 34 After the calibration of the multi-leaf grating is completed, the electronic portal imaging device 11 descends from the isocenter plane into the groove 15 of the support body 10 , and performs portal verification and dose verification on the treatment head 34 .
  • the multi-stage scissor assembly includes a two-stage scissor assembly. If the drive motor 24 receives the calibration signal of the multi-leaf grating, the drive motor 24 The driving screw 30 rotates clockwise to drive the second living hinge 29 to move horizontally to the left, so as to drive the secondary scissor assembly to move upward, and the secondary scissor assembly drives the electron beam fixed on the support plate 13
  • the imaging device 11 is raised to the isocenter plane, and the electronic portal imaging device 11 captures an image of the shape of the portal formed by the treatment head 34 on the isocenter plane, so as to calibrate the multi-leaf grating of the treatment head 34 .
  • the drive motor 24 drives the screw rod 30 to rotate in the counterclockwise direction, and drives the second living hinge 29 to move horizontally to the right, so as to drive the secondary scissor assembly to move downward, and the secondary scissor assembly
  • the electron portal imaging device 11 fixed on the upper surface of the support plate 13 is driven to descend from the isocenter plane into the groove 15 of the support body 10 .
  • auxiliary shielding plates 16 are provided at positions corresponding to the grooves on the back of the support body 10 .
  • the back of the support body 10 can be the bottom view of the support body 10
  • the auxiliary shielding plate 16 is made of tungsten alloy
  • the shape of the auxiliary shielding plate 16 can be rectangular, square, circular or oval. Therefore, by arranging the auxiliary shielding plate at the position corresponding to the groove on the back of the support body, the radiation emitted by the treatment head can be supplemented and shielded, and the radiation emitted by the treatment head can be further prevented from leaking to the external environment and causing harm to the environment.
  • a boss 14 is formed on the inner wall of the groove 15 in the circumferential direction.
  • the support plate 13 abuts against the boss 14 .
  • the boss 14 may be a ring-shaped block or composed of a plurality of separate geometric blocks, the shape of the boss 14 may be square, rectangle, ellipse or circle, etc., and the material of the boss may be lead material or tungsten alloy etc.
  • the abutment of the support plate 13 and the boss 14 can be understood as when the electron portal imaging device 11 is in the treatment state position, the surface formed by the circumferential direction of the inner wall of the groove 15 and the boss 14 is in contact with the lower surface of the support plate 13 . Therefore, when the electronic portal imaging device is in the treatment state position, the support plate abuts the boss, which can effectively fix the supporting plate and the electronic portal imaging device, and prevent the supporting plate and the electronic portal imaging device from loosening when the frame rotates.
  • At least one positioning pin 18 is provided on the contact surface 17 of the boss 14 and the support plate 13 , and the support plate 13 is provided with a positioning hole 23 corresponding to the at least one positioning pin 18 .
  • the electronic portal imaging device When the 11 is in the treatment state position, the positioning pin 18 is inserted into the corresponding positioning hole 23 , and the support plate 13 abuts against the boss 14 .
  • At least one positioning pin is arranged on the contact surface of the boss and the support plate, and a positioning hole corresponding to the at least one positioning pin is arranged on the support plate, which can effectively Fix the support plate and the electronic portal imaging device to further avoid the deflection of the supporting plate and the electronic portal imaging device when the frame is rotated, resulting in loss of accuracy.
  • four cylindrical positioning pins 18 are provided on the contact surface 17 of the boss 14 and the support plate 13 .
  • the support plate 13 is provided with circular positioning holes 23 corresponding to the four positioning pins 18 .
  • FIG. 7 when the electron portal imaging device 11 is in the treatment state position, the surface formed by the circumferential direction of the inner wall of the groove 15 and the boss 14 is in contact with the lower surface of the support plate 13 , and the electron portal imaging device 11 It is fixed to the upper surface of the support plate 13 .
  • a lift guide mechanism is provided between the bottom surface of the groove 15 and the support plate 13 .
  • the lifting guide mechanism includes multiple groups of antenna-type lifting columns 32 .
  • the lift guide mechanism includes two sets of antenna lift columns 32 .
  • the two sets of antenna-type lifting columns 32 can be extended and retracted with the scissor assembly.
  • the antenna-type lifting column 32 is multi-stage hollow cylindrical, with small gaps, and moves along the axial direction between the stages, which mainly play a guiding role, so as to avoid the positional deviation of the electronic portal imaging device 11 during the lifting process, resulting in the electronic portal The position of the video device 11 is wrong. Therefore, by arranging a lifting guide mechanism between the bottom surface of the groove and the support plate, the accuracy of the position of the electronic portal imaging device can be effectively ensured.
  • the calibration apparatus further includes: a position detection device, the main body of the position detection device is disposed in the support body 10 , and the detection end of the position detection device is connected to the electronic portal imaging device 11 , and the position detection device is used for The position of the electron portal imaging device 11 is detected.
  • the position detection device includes a pull-rope sensor, and the wire rope of the pull-rope sensor is fixedly connected to the electronic portal imaging device 11 .
  • the function of the pull cord sensor is to convert mechanical movement into electrical signals that can be measured, recorded or transmitted.
  • the pull cord sensor consists of a stretchable stainless steel cord wrapped around a threaded hub that is connected to a precision rotary sensor, which can be incremental, absolute (independent), hybrid or conductive Plastic rotary potentiometers, synchronizers or resolvers.
  • a precision rotary sensor which can be incremental, absolute (independent), hybrid or conductive Plastic rotary potentiometers, synchronizers or resolvers.
  • the main body of the pull cord sensor is installed in the support body 10 , and the pull cord is tied to the electronic portal imaging device 11 .
  • the linear movement of the pulling rope is aligned with the movement axis of the electronic portal imaging device 11 .
  • the drawstring stretches and contracts as the movement occurs.
  • An internal spring keeps the tension of the drawstring constant.
  • the threaded hub drives the rotation of the precision rotation sensor, which outputs an electrical signal proportional to the distance the cable moves.
  • the displacement, direction or velocity of the electron portal imaging device 11 can be obtained by measuring the output signal. Thereby, the
  • the connecting wire of the electronic portal imaging device 11 is placed in the drag chain.
  • the first end of the drag chain is fixedly connected with the electronic portal imaging device 11
  • the second end of the drag chain is fixedly connected with the support body 10 .
  • a ring accelerator includes: the multi-leaf grating calibration device according to the first aspect of the embodiment of the present application, the treatment head 34 and the frame 33 ; the calibration device and the treatment head 34 are arranged in the frame 33 ; the calibration device is opposite to the treatment head 34 .
  • the electronic portal imaging device collects an image of the shape of the portal formed by the treatment head on the isocenter plane, and the image can objectively and accurately represent the treatment head in the isocenter.
  • the shape of the radiation field formed by the plane can truly reflect the quality and accuracy of the shape of the radiation field formed by the treatment head on the isocenter plane, provide accurate and real data for the calibration of the multi-leaf grating of the treatment head, and can easily and accurately adjust the treatment head.
  • the multi-leaf grating is calibrated, thereby improving the accuracy, reliability and convenience of multi-leaf grating calibration.
  • the calibration equipment of the multi-leaf grating of the ring accelerator is arranged on the ring frame of the ring accelerator.
  • the treatment head 34 of the ring accelerator is facing the plane where the imaging area 12 of the electron portal imaging device 11 is located, that is, the plane where the imaging area 12 of the electron portal imaging device 11 is located and the ring accelerator
  • the axis of the radiation beam emitted by the treatment head 34 is vertical.
  • the drive mechanism receives the calibration signal of the multi-leaf grating of the annular accelerator, the drive mechanism drives the scissors assembly to move upward, and the scissors assembly drives the electronic portal imaging device 11 to rise to the isocenter plane of the annular accelerator, The electronic portal imaging device 11 acquires images of the shape of the portal formed by the treatment head 34 on the isocenter plane, so as to be used for calibrating the multi-leaf grating of the treatment head 34 of the ring accelerator.
  • the driving mechanism drives the scissors assembly to move downward, and the scissors assembly drives the electronic portal imaging device 11 to descend from the isocenter plane to the groove 15 of the support body 10 , the electron portal imaging device 11 rotates with the annular gantry, and performs portal verification and dose verification on the treatment head 34 of the annular accelerator.
  • first,” “second,” “the first,” or “the second” as used in various embodiments of this application may modify various elements regardless of order and/or importance , but these expressions do not limit the corresponding parts.
  • the above expressions are only used for the purpose of distinguishing an element from other elements.
  • the first user equipment and the second user equipment represent different user equipments, although both are user equipments.
  • a first element could be termed an element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Radiation-Therapy Devices (AREA)

Abstract

La présente invention concerne un appareil d'étalonnage pour un collimateur multilame, et un accélérateur annulaire. L'appareil d'étalonnage comprend : un support (10) disposé sur un bâti (33) ; un mécanisme de levage dont une extrémité est reliée au support (10) ; et un dispositif d'imagerie à portail d'électrons (11) relié à l'autre extrémité du mécanisme de levage, le mécanisme de levage amenant le dispositif d'imagerie à portail d'électrons (11) à se déplacer vers le haut et vers le bas, de sorte que le dispositif d'imagerie à portail d'électrons (11) est situé à différentes positions de travail, les positions de travail comprenant une position d'état d'étalonnage et une position d'état de traitement. Lorsque le mécanisme de levage entraîne le dispositif d'imagerie à portail d'électrons (11) pour le placer dans la position d'état d'étalonnage, un collimateur multilame peut être étalonné de manière commode, rapide et précise, et par conséquent la précision, la fiabilité et la commodité de l'étalonnage du collimateur multilame sont améliorées.
PCT/CN2020/139659 2020-12-25 2020-12-25 Appareil d'étalonnage pour collimateur multilame et accélérateur annulaire WO2022134083A1 (fr)

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CN102526885A (zh) * 2010-09-30 2012-07-04 西门子公司 用于校准多叶式准直器的方法
US20120241638A1 (en) * 2011-03-23 2012-09-27 Elekta Ab (Publ) Apparatus for the extension and retraction of a peripheral device
CN102256434A (zh) * 2011-06-23 2011-11-23 山东新华医疗器械股份有限公司 同源双能igrt医用电子直线加速器
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