WO2020103437A1 - 光阑位置检测装置及医用加速器治疗头 - Google Patents

光阑位置检测装置及医用加速器治疗头

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Publication number
WO2020103437A1
WO2020103437A1 PCT/CN2019/091163 CN2019091163W WO2020103437A1 WO 2020103437 A1 WO2020103437 A1 WO 2020103437A1 CN 2019091163 W CN2019091163 W CN 2019091163W WO 2020103437 A1 WO2020103437 A1 WO 2020103437A1
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WO
WIPO (PCT)
Prior art keywords
arc
diaphragm
position detection
displacement sensor
detection device
Prior art date
Application number
PCT/CN2019/091163
Other languages
English (en)
French (fr)
Inventor
唐子明
郭召
杨跃明
Original Assignee
西安大医集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西安大医集团股份有限公司 filed Critical 西安大医集团股份有限公司
Priority to US16/979,907 priority Critical patent/US11380454B2/en
Publication of WO2020103437A1 publication Critical patent/WO2020103437A1/zh

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
    • 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
    • A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
    • 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
    • A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
    • A61N5/1043—Scanning the radiation beam, e.g. spot scanning or raster scanning
    • 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
    • A61N5/1048—Monitoring, verifying, controlling systems and methods
    • A61N5/1064—Monitoring, verifying, controlling systems and methods for adjusting radiation treatment in response to monitoring
    • A61N5/1065—Beam adjustment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
    • 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
    • A61N5/1048—Monitoring, verifying, controlling systems and methods
    • 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
    • A61N5/1077—Beam delivery systems
    • A61N5/1078—Fixed beam systems

Definitions

  • the present disclosure relates to the technical field of medical equipment, and in particular to a diaphragm position detection device and a medical accelerator treatment head.
  • the diaphragm of the medical accelerator treatment head is driven by a motor, and the output dose of X-rays is controlled by the opening and closing of the diaphragm. Therefore, in order to accurately control the movement of the treatment head diaphragm, it is necessary to detect the specific position of the treatment head diaphragm in real time.
  • the diaphragm In order to reduce the penumbra of X-ray radiation, the diaphragm is required to move at any angle, and its inner surface is tangent to the X-ray, so the diaphragm usually moves in an arc.
  • an encoder In order to detect the position of the diaphragm that moves in an arc, an encoder is often used in the related art. A chip is integrated inside the encoder, which can convert the angular displacement into an electrical signal, and then the position of the diaphragm can be obtained.
  • An embodiment of the present disclosure provides an aperture position detection device. Use the following technical solutions:
  • an embodiment of the present disclosure provides an aperture position detection device for detecting position information of an aperture-moving aperture, including a connector, a conversion mechanism, and a displacement sensor, where the connector is fixed to the aperture
  • the input end of the conversion mechanism is connected to the connecting member, and when the connecting member makes an arc-shaped movement with the diaphragm, the conversion mechanism converts the arc-shaped movement of the connecting member into a linear movement
  • the displacement sensor is connected to the output end of the conversion mechanism and is used for detecting displacement information of the linear movement of the output end of the conversion mechanism.
  • the conversion mechanism includes a linear guide extending in the first direction and a sliding member that can slide along the linear guide, the sliding member is provided with a first sliding groove and a second sliding groove along the second direction, The end of the connecting member extends into the first sliding groove, the displacement sensor is connected to the second sliding groove, and the second direction is perpendicular to the first direction.
  • the distance that the first chute extends in the second direction is greater than or equal to the displacement in the second direction when the connecting rod moves in an arc shape.
  • an end of the connecting portion is sleeved with a bearing, and an outer wall of the bearing abuts an inner wall of the first sliding groove extending in the second direction.
  • the bearing is a rolling bearing.
  • the displacement sensor includes a variable resistance slide rail and an extension shaft, the variable resistance slide rail extends in the second direction, and the first end of the extension shaft can slide along the variable resistance The rail slides, and the second end is connected to the second sliding groove of the sliding member.
  • the conversion mechanism includes a connecting rod and a slider, one end of the connecting rod is hinged to the connecting member, and the other end is hinged to the slider, and the slider is connected to the displacement sensor.
  • the displacement sensor is a linear displacement sensor.
  • the diaphragm position detection device of the embodiment of the present disclosure includes a connecting member, a conversion mechanism, and a displacement sensor.
  • the connecting member is fixed on the diaphragm, and then performs arc-shaped movement with the diaphragm.
  • the input end of the conversion mechanism is connected to the connection piece, and when the connection piece makes an arc motion with the diaphragm, the conversion mechanism can convert the arc movement of the connection piece into a linear motion, and further, a displacement sensor connected to the output end of the conversion mechanism
  • the displacement information of the linear movement of the output end of the conversion mechanism can be directly detected. In this way, the displacement information detected by the displacement sensor can obtain the position information of the diaphragm to realize the detection of the position of the diaphragm.
  • the arc motion of the diaphragm is converted into a linear motion at the output end of the conversion mechanism, and then a displacement sensor can be used for detection.
  • the basic principle of the displacement sensor is a sliding resistor, which does not contain devices such as chips that are not resistant to X-ray irradiation, so it can adapt to high-dose irradiation and is not easy to damage.
  • the displacement sensor has higher detection accuracy than the encoder.
  • an embodiment of the present disclosure further provides a medical accelerator treatment head, including at least one diaphragm, the diaphragm performs arc-shaped movement, and further includes the above-mentioned diaphragm position detection device.
  • it also includes a motor, a rotating gear and an arc gear ring, wherein the rotating gear is connected to the diaphragm, and under the drive of the motor, the rotating gear can be arc-shaped along the arc gear ring motion.
  • an arc-shaped ring gear mounting base is also included, and the arc-shaped ring gear is mounted on the arc-shaped ring gear mounting base.
  • the linear guide of the diaphragm position detection device is fixed on the arc ring gear mounting seat.
  • the medical accelerator treatment head provided by the embodiment of the present disclosure, because the diaphragm performs arc-shaped movement, therefore, after the above-mentioned diaphragm position detection device is included, the position information of the diaphragm can be effectively detected, and it can adapt to large dose irradiation, which is not easy Damaged, and high detection accuracy.
  • FIG. 1 is a schematic structural diagram of a diaphragm position detection device according to an embodiment of the present disclosure
  • Embodiment 1 of a diaphragm position detection device according to an embodiment of the present disclosure
  • Embodiment 3 is a partial structural schematic diagram of Embodiment 1 of a diaphragm position detection device according to an embodiment of the present disclosure
  • FIG. 4 is one of the three-dimensional structural schematic diagrams of the diaphragm position detection device of the embodiment of the present disclosure in the case of two diaphragms;
  • FIG. 5 is a second schematic structural view of the diaphragm position detection device of the embodiment of the present disclosure in the case of two diaphragms;
  • Embodiment 2 is a schematic structural diagram of Embodiment 2 of an aperture position detection device according to an embodiment of the present disclosure.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise stated, “plurality” means two or more.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a removable Connect, or connect integrally.
  • connection should be understood in specific situations.
  • the detection accuracy of the encoder itself is not high, and the measurement of X-rays during the treatment of the medical accelerator treatment head is large, which will cause great interference to the transmission of the chip signal inside the encoder, further reducing the accuracy of detection
  • the chip is used for a long time under a large dose of radiation, which is easy to damage.
  • the diaphragm position detection device provided by the embodiment of the present disclosure is used to detect the position information of the diaphragm 1 performing arc-shaped movement, as shown in FIGS. 1 and 2, and the diaphragm position of the embodiment of the present disclosure
  • the detection device includes a connecting member 2, a conversion mechanism 3 and a displacement sensor 4, the connecting member 2 is fixed on the diaphragm 1, the input end of the conversion mechanism 3 is connected to the connecting member 2, when the connecting member 2 follows the diaphragm 1 to make an arc
  • the conversion mechanism 3 converts the arc motion of the connecting member 2 into a linear motion, and the displacement sensor 4 is connected to the output end of the conversion mechanism 3 for detecting displacement information of the linear motion of the output end of the conversion mechanism 3.
  • the diaphragm position detection device of the embodiment of the present disclosure includes a connecting member 2, a conversion mechanism 3 and a displacement sensor 4, and the connecting member 2 is fixed on the diaphragm 1, which will follow the light
  • the stop 1 performs an arc-shaped movement.
  • the input end of the conversion mechanism 3 is connected to the connecting member 2, and when the connecting member 2 makes an arc-shaped movement with the diaphragm 1, the conversion mechanism 3 can convert the arc-shaped movement of the connecting member 2 into a linear movement, and furthermore, to the conversion mechanism 3
  • the displacement sensor 4 connected to the output end of the sensor can directly detect the displacement information of the linear movement of the output end of the conversion mechanism 3, so that the displacement information detected by the displacement sensor 4 can obtain the position information of the diaphragm 1 to realize the position of the diaphragm 1 Detection.
  • the arc motion of the diaphragm 1 is converted into a linear motion at the output end of the conversion mechanism 3, and then the displacement sensor 4 can be used for detection.
  • the basic principle of the displacement sensor 4 is a sliding resistor, which does not contain devices such as chips that are not resistant to X-ray irradiation, so it can adapt to high-dose irradiation and is not easily damaged. And the displacement sensor 4 has higher detection accuracy than the encoder.
  • the conversion mechanism 3 can have multiple implementations, and the example introduces two specific implementations:
  • the conversion mechanism 3 includes a linear guide 31 extending in the first direction and a slide 32 that can slide along the linear guide 31.
  • a first chute 33 and a second chute 34 are provided along the second direction.
  • the end of the connecting member 2 cooperates to extend into the first chute 33.
  • the displacement sensor 4 is connected to the second chute 34.
  • One direction is vertical.
  • the force pushing the slider 32 can be decomposed into mutually perpendicular force in the first direction and force in the second direction, wherein the force in the second direction
  • the free end of the connecting member 2 slides in the second direction in the first sliding slot 33, and the force in the first direction causes the connecting member 2 to push the inner wall of the first sliding slot 33 extending in the second direction, thereby making the sliding member 32 Perform a linear slide in the first direction.
  • the arc motion of the connector 2 can be converted into a linear slide.
  • the displacement sensor 4 is connected to the second chute 34 to facilitate the displacement sensor 4 to detect the distance information of the linear slide and obtain the position information of the diaphragm 1.
  • the linear guide 31 can guide and limit the sliding of the slide 32.
  • the connection between the displacement sensor 4 and the output end of the conversion mechanism 3 is in the form of cooperation with the chute, which is convenient for assembly, and the second chute 34 can make the displacement sensor 4 related Avoid moving parts.
  • the distance that the first sliding groove 33 extends in the second direction is greater than or equal to the displacement in the second direction when the connecting member 2 moves in an arc shape. In this way, the distance that the connecting member 2 moves in the second direction is smaller than the distance that the first chute extends in the second direction, so that the movement of the connecting member 2 is not hindered.
  • the movement of the connecting member 2 is an arc-shaped movement, when the end of the connecting rod 2 moves in the first sliding groove 33, it not only slides in the first sliding groove 33 in the second direction, but also rotates at a certain angle. Therefore, in order to reduce the friction between the free end of the connecting member 2 and the first chute 33 and facilitate the transmission of mechanical force, as shown in FIG. 3, the end of the connecting member 2 is sleeved with a bearing 5, and the outer wall of the bearing 5 and the first An inner wall of a sliding groove 33 extending in the second direction abuts.
  • the arrangement of the bearing 5 can well adapt to the sliding and rotation of the end of the connecting member 2 in the first sliding groove 33, reduce friction, facilitate the transmission of force, and ensure the accuracy of detection.
  • the bearing 5 may be a rolling bearing or other bearings, and the embodiment of the present disclosure is not specifically limited.
  • the specific structure of the displacement sensor 4 is shown in FIGS. 2 and 3.
  • the displacement sensor 4 includes a variable resistance slide 41 and an extension shaft 42.
  • the variable resistance slide 41 extends in the second direction and extends beyond the first end of the shaft 42 It can slide along the variable resistance sliding rail 41, and the second end is fixedly connected to the second sliding groove 34 of the sliding member 32. In this way, when the slider 32 moves linearly, it will pull the extension shaft 42 to slide along the variable resistance sliding rail 41, so that the resistance value changes, and then the information of the linear displacement can be detected.
  • the displacement sensor 4 can be directly mounted on the arc ring gear 8, as shown in FIGS. 1 and 2 on the sensor mounting base 10, and the sensor mounting base 10 is mounted on the arc ring gear 8.
  • the displacement sensor 4 may be a linear displacement sensor or other displacement sensors that can realize this function, and this embodiment is not specifically limited.
  • the conversion mechanism 3 is another implementation manner. Specifically, as shown in FIG. 6, the conversion mechanism 3 includes a connecting rod 35 and a slider 36, and the connecting rod One end of 35 is hinged with the connector 2 and the other end is hinged with the slider 36, and the slider 36 is connected with the displacement sensor 4. In this way, since the length of the connecting rod 35 is fixed, when the connecting member 2 moves in an arc, the distance between the connecting member 2 and the slider 36 gradually changes, and then the connecting rod 35 will push the slider 36 to slide linearly.
  • the above solution constitutes a crank slider mechanism, which can also convert the arc motion of the connecting rod 2 into a linear motion, thereby facilitating the displacement sensor 4 to detect the displacement information of the linear motion of the output end of the conversion mechanism 3, and thereby obtaining the position of the diaphragm 1 information.
  • the sliding of the slider 36 also requires a corresponding sliding rail structure 37.
  • the slider 36 is pushed by the connecting rod 35 and slides linearly along the sliding rail structure 37.
  • other components of the diaphragm position detection device of this embodiment such as the connector 2 and the displacement sensor 4, are similar to the first embodiment, and only need to be adaptively installed.
  • an embodiment of the present disclosure also provides a medical accelerator treatment head, which includes at least one diaphragm 1, the diaphragm 1 moves in an arc shape, and further includes the diaphragm position detection device mentioned in the foregoing embodiment.
  • the medical accelerator treatment head provided by the embodiment of the present disclosure, since the diaphragm 1 performs an arc-shaped movement, therefore, after including the above-mentioned diaphragm position detection device, the position information of the diaphragm 1 can be effectively detected, and can be adapted to high-dose irradiation , Not easy to damage, and high detection accuracy.
  • the medical accelerator treatment head of the disclosed embodiment further includes a motor 6, a rotating gear 7 and an arc ring gear 8, wherein the rotating gear 7 is connected to the diaphragm 1, and under the drive of the motor 6, the rotating gear 7 can be along the arc ring gear 8 Do arc-shaped movements.
  • the diaphragm 1 needs to move in an arc along the curved ring gear 8
  • the slider 32 of the diaphragm position detection device needs to slide along the linear guide 31
  • the extension axis of the displacement sensor 4 42 needs to slide along the variable resistance sliding rail 41
  • the above-mentioned similar guide rail mechanisms need to be fixed to ensure the movement of the corresponding moving parts thereon, therefore, referring to FIG. 1, FIG. 4 and FIG. 5, it also includes a curved ring gear mounting seat 9. In this way, the arc-shaped ring gear 8 can be installed on the arc-shaped ring gear mounting base 9.
  • the linear guide 31 of the diaphragm position detection device can be fixed on the arc ring gear mounting base 9; the variable resistance slide rail 41 of the displacement sensor 4 can also be fixed on the arc ring gear mounting base 9.
  • the variable resistance slide rail 41 of the displacement sensor 4 may also be fixed on the end surface of the arc ring gear 8.
  • the variable resistance slide rail 41 of the displacement sensor 4 may be fixed on the sensor installation Seat 10. The final purpose of the layout of the linear guide rail 31 and the variable resistance slide rail 41 is to be relatively fixed with the arc ring gear 8 to ensure the normal movement of the moving parts in the entire mechanism.
  • the diaphragm position detection device of the embodiment of the present disclosure can detect the position information of multiple diaphragms 1 at a time.
  • the diaphragm position detection device of the embodiment of the present disclosure can detect the position information of multiple diaphragms 1 at a time.
  • the diaphragm position detection device of the embodiment of the present disclosure can detect the position information of multiple diaphragms 1 at a time.
  • the connecting rod 2 can penetrate the diaphragm 1 and have bearings 5 at both ends .
  • the two arc-shaped ring gears 8 have tracks matching with the bearings 5 at both ends of the connecting member 2; correspondingly, two arc-shaped ring gears 8
  • Two rotary gears 7 are provided on both sides of the stop 1, and the two rotary gears 7 are respectively matched with the two arc-shaped ring gears 8. In this way, the diaphragm 1 moves more smoothly along the arc ring gear 8 during the arc movement.

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Abstract

一种光阑位置检测装置及医用加速器治疗头，涉及医疗设备技术领域，能够适应大剂量辐照，不易损坏，且检测精度高。一种光阑位置检测装置，用于检测做弧形运动的光阑（1）的位置信息，包括连接件（2）、转换机构（3）和位移传感器（4），其中，连接件（2）固定在光阑（1）上，转换机构（3）的输入端与连接件（2）连接，当连接件（2）随光阑（1）做弧形运动时，转换机构（3）将连接件（2）的弧形运动转换为直线运动，位移传感器（4）与转换机构（3）的输出端连接，用于检测转换机构（3）的输出端直线运动的位移信息。

Description

光阑位置检测装置及医用加速器治疗头
本公开要求于2018年11月20日提交至国家知识产权局、公开号为201811386598.7、发明名称为“一种光阑位置检测装置及医用加速器治疗头”的中国专利公开的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及医疗设备技术领域，尤其涉及一种光阑位置检测装置及医用加速器治疗头。
背景技术
医用加速器治疗头的光阑由电机驱动，通过光阑的打开和闭合，来控制X射线的输出剂量。因此，为了精确地控制治疗头光阑运动，需要实时地检测治疗头光阑的具体位置。
为减小X射线的辐射半影，要求光阑运动在任意角度，其内表面均与X射线相切，所以光阑通常做弧线运动。为了可以检测做弧形运动的光阑的位置，相关技术中常采用编码器来实现。编码器内部集成有芯片，可以将角位移转换成电信号，进而可以获取光阑的位置。
发明内容
本公开的实施例提供一种光阑位置检测装置。采用如下技术方案：
一方面，本公开实施例提供一种光阑位置检测装置，用于检测做弧形运动的光阑的位置信息，包括连接件、转换机构和位移传感器，所述连接件固定在所述光阑上，所述转换机构的输入端与所述连接件连接，当所述连接件随所述光阑做弧形运动时，所述转换机构将所述连接件的弧形运动转换为直线运动，所述位移传感器与所述转换机构的输出端连接，用于检测所述转换机构的输出端直线运动的位移信息。
可选地，转换机构包括沿第一方向延伸的直线导向件以及可沿所述直线导向件滑动的滑动件，所述滑动件上沿第二方向开设有第一滑槽和第二滑槽，所述连接件的端部配合伸入所述第一滑槽内，所述位移传感器与所述第二滑槽连接，所述第二方向与所述第一方向垂直。
可选地，所述第一滑槽沿所述第二方向延伸的距离大于或等于所述连接杆弧形运动时在所述第二方向上的位移。
可选地，所述连接部的端部套设有轴承，所述轴承的外壁与所述第一滑槽沿第二方向延伸的内壁抵靠。
可选地，所述轴承为滚动轴承。
可选地，所述位移传感器包括可变电阻滑轨和伸出轴，所述可变电阻滑轨沿所述第二方向延伸，所述伸出轴的第一端可沿所述可变电阻滑轨滑动，第二端与所述滑动件的所述第二滑槽连接。
可选地，所述转换机构包括连杆和滑块，所述连杆的一端与所述连接件铰接，另一端与所述滑块铰接，所述滑块与所述位移传感器连接。
可选地，所述位移传感器为直线位移传感器。
本公开实施例的光阑位置检测装置，由于包括连接件、转换机构和位移传感器，连接件固定在所述光阑上，进而会随光阑进行弧形运动。转换机构的输入端与连接件连接，且当连接件随光阑做弧形运动时，转换机构可以将连接件的弧形运动转换为直线运动，进而，与转换机构的输出端连接的位移传感器可以直接检测转换机构的输出端直线运动的位移信息，这样，通过位移传感器检测到的位移信息，可以获取光阑的位置信息，实现光阑位置的检测。相比相关技术，将光阑的弧线运动转换成了转换机构的输出端的直线运动，进而可以采用位移传感器来实现检测。其中，位移传感器的基本原理为滑变电阻，其内部不包含芯片等不耐X射线辐照的器件，因此能够适应大剂量辐照，不易损坏。且位移传感器相比编码器，检测精度高。
另一方面，本公开实施例还提供一种医用加速器治疗头，包括至少一个光阑，所述光阑做弧形运动，还包括上述的光阑位置检测装置。
可选地，还包括电机、旋转齿轮和弧形齿圈，其中，所述旋转齿轮与所述光阑连接，在电机的驱动下，所述旋转齿轮可沿所述弧形齿圈做弧形运动。
可选地，还包括弧形齿圈安装座，所述弧形齿圈安装于所述弧形齿圈安装座上。
可选地，所述光阑位置检测装置的直线导向件固定在所述弧形齿 圈安装座上。
本公开实施例提供的医用加速器治疗头，由于光阑做弧形运动，因此，包括了上述的光阑位置检测装置后，可以有效检测光阑的位置信息，且能够适应大剂量辐照，不易损坏，且检测精度高。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例和相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例的光阑位置检测装置的结构示意图；
图2为本公开实施例的光阑位置检测装置的实施例一的结构示意图；
图3为本公开实施例的光阑位置检测装置的实施例一的局部结构示意图；
图4为本公开实施例的光阑位置检测装置的在两个光阑的情况下的立体结构示意图之一；
图5为本公开实施例的光阑位置检测装置的在两个光阑的情况下的立体结构示意图之二；
图6为本公开实施例的光阑位置检测装置的实施例二的结构示意图。
附图标记：
1-光阑；2-连接件；3-转换机构；31-直线导向件；32-滑动件；33-第一滑槽；34-第二滑槽；35-连杆；36-滑块；37-滑轨结构；4-位移传感器；41-可变电阻滑轨；42-伸出轴；5-轴承；6-电机；7-旋转齿轮；
8-弧形齿圈；9-弧形齿圈安装座；10-传感器安装座。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例， 而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
相关技术中编码器本身的检测精度不高，且医用加速器治疗头在工作时X射线的计量较大，这样会对编码器内部的芯片信号的传输造成很大的干扰，进一步降低了检测的准确性，且芯片长期在大剂量的辐照下使用，很容易损坏。
为此，一方面，本公开实施例提供的光阑位置检测装置，如图1和图2所示，用于检测做弧形运动的光阑1的位置信息，本公开实施例的光阑位置检测装置包括连接件2、转换机构3和位移传感器4，连接件2固定在光阑1上，转换机构3的输入端与连接件2连接，当连接件2随光阑1做弧形运动时，转换机构3将连接件2的弧形运动转换为直线运动，位移传感器4与转换机构3的输出端连接，用于检测转换机构3的输出端直线运动的位移信息。
本公开实施例的光阑位置检测装置，如图1和图2所示，由于包括连接件2、转换机构3和位移传感器4，连接件2固定在所述光阑1上，进而会随光阑1进行弧形运动。转换机构3的输入端与连接件2连接，且当连接件2随光阑1做弧形运动时，转换机构3可以将连接件2的弧形运动转换为直线运动，进而，与转换机构3的输出端连接的位移传感器4可以直接检测转换机构3的输出端直线运动的位移信息，这样，通过位移传感器4检测到的位移信息，可以获取光阑1的位置信息，实现光阑1位置的检测。相比相关技术，将光阑1的弧线 运动转换成了转换机构3的输出端的直线运动，进而可以采用位移传感器4来实现检测。其中，位移传感器4的基本原理为滑变电阻，其内部不包含芯片等不耐X射线辐照的器件，因此能够适应大剂量辐照，不易损坏。且位移传感器4相比编码器，检测精度高。
转换机构3可以有多种实现方式，示例的介绍两种具体的实现方式：
实施例一
本实施例的光阑位置检测装置，如图1和图2所示，转换机构3包括沿第一方向延伸的直线导向件31以及可沿直线导向件31滑动的滑动件32，滑动件32上沿第二方向开设有第一滑槽33和第二滑槽34，连接件2的端部配合伸入第一滑槽33内，位移传感器4与第二滑槽34连接，第二方向与第一方向垂直。
这样，当连接件2随光阑1进行弧形运动时，推动滑动件32的力可以分解为互相垂直的沿第一方向的力和沿第二方向的力，其中，沿第二方向的力使连接件2的自由端在第一滑槽33内沿第二方向滑动，而沿第一方向的力使连接件2推动第一滑槽33沿第二方向延伸的内壁，进而使滑动件32进行沿第一方向的直线滑动。进而可以将连接件2的弧线运动转换为直线滑动。同时，位移传感器4与第二滑槽34连接，以方便位移传感器4检测该直线滑动的距离信息，得到光阑1的位置信息。其中直线导向件31可以引导和限位滑动件32的滑动。
需要说明的是，通过设置第二滑槽34，使位移传感器4与转换机构3的输出端的连接方式为与滑槽配合的形式，方便装配，且第二滑槽34可以使位移传感器4的相关活动部件避免卡顿。
为了保证连接件2沿第一滑槽33滑动时，不会碰到第一滑槽33沿第一方向延伸的内壁，而导致阻挡连接件2的正常运动。第一滑槽33沿第二方向延伸的距离大于或等于连接件2弧形运动时在第二方向上的位移。这样，连接件2沿第二方向运动的距离小于第一滑槽沿第二方向延伸的距离，不会使连接件2的运动被阻碍。
由于连接件2的运动为弧形运动，连接杆2的端部在第一滑槽33内运动时，不仅会沿第二方向在第一滑槽33内滑动，还会有一定角度的转动，因此，为了减小连接件2的自由端与第一滑槽33的摩擦，便 于机构力的传递，如图3所示，连接件2的端部套设有轴承5，轴承5的外壁与第一滑槽33沿第二方向延伸的内壁抵靠。轴承5的设置可以很好的适应连接件2的端部在第一滑槽33内的滑动及转动，减小摩擦，便于力的传递，保证检测的准确性。
这里，轴承5可以为滚动轴承，还可以为其他轴承，本公开实施例不作具体限定。
位移传感器4的具体结构如图2和图3所示，位移传感器4包括可变电阻滑轨41和伸出轴42，可变电阻滑轨41沿第二方向延伸，伸出轴42的第一端可沿可变电阻滑轨41滑动，第二端与滑动件32的第二滑槽34固定连接。这样，当滑动件32直线运动时，会拉动伸出轴42沿可变电阻滑轨41滑动，使电阻值出现变化，进而可以检测到直线位移的信息。
进一步的，位移传感器4可以直接安装在弧形齿圈8上，可以如图1和图2所示的安装在传感器安装座10上，而传感器安装座10安装在弧形齿圈8上。
这里，位移传感器4可以为直线位移传感器，也可以为其他可实现本功能的位移传感器，本实施例不作具体限定。
实施例二
本实施例的光阑位置检测装置与实施例一的区别在于，转换机构3为另外一种实现方式，具体的，如图6所示，转换机构3包括连杆35和滑块36，连杆35的一端与连接件2铰接，另一端与滑块36铰接，滑块36与位移传感器4连接。这样，由于连杆35的长度为固定的，当连接件2进行弧形运动时，连接件2与滑块36之间的距离逐渐变化，进而连杆35会推动滑块36直线滑动。即，上述方案构成曲柄滑块机构，也可以将连接杆2的弧线运动转换为直线运动，进而方便位移传感器4检测转换机构3的输出端直线运动的位移信息，进而得到光阑1的位置信息。
需要说明的是，参照图6，滑块36的滑动也需要对应的滑轨结构37，滑块36被连杆35推动，沿滑轨结构37直线滑动。当然，本实施例的光阑位置检测装置的其他部件，例如连接件2和位移传感器4等部件和实施例一类似，只需要进行适应性的配合安装即可。
另一方面，本公开实施例还提供一种医用加速器治疗头，包括至少一个光阑1，光阑1做弧形运动，还包括上述实施例提及的光阑位置检测装置。
本公开实施例提供的医用加速器治疗头，由于光阑1做弧形运动，因此，包括了上述的光阑位置检测装置后，可以有效检测光阑1的位置信息，且能够适应大剂量辐照，不易损坏，且检测精度高。
需要说明的是，光阑1做弧形运动是为了更好的进行治疗，其实现的方式有多种，一般的，如图1、图4和图5所示，为一种实现方式，本公开实施例的医用加速器治疗头还包括电机6、旋转齿轮7和弧形齿圈8，其中，旋转齿轮7与光阑1连接，在电机6的驱动下，旋转齿轮7可沿弧形齿圈8做弧形运动。
在本实施例的医用加速器治疗头中，光阑1需要沿弧形齿圈8进行弧形运动，光阑位置检测装置的滑动件32需要沿直线导向件31滑动，位移传感器4的伸出轴42需要沿可变电阻滑轨41滑动，上述这些类似的导轨机构需要固定才能保证其上对应的运动部件的运动，因此，参照图1、图4和图5，还包括弧形齿圈安装座9，这样，弧形齿圈8可以安装于弧形齿圈安装座9上。当然，类似的，光阑位置检测装置的直线导向件31可以固定在弧形齿圈安装座9上；位移传感器4的可变电阻滑轨41也可以固定在弧形齿圈安装座9上。参照图1，为了方便布局，也可以将位移传感器4的可变电阻滑轨41固定在弧形齿圈8的端面上，当然，可以将位移传感器4的可变电阻滑轨41固定在传感器安装座10上。以上的直线导轨31和可变电阻滑轨41的布局方式最终目的都是与弧形齿圈8相对固定，以保证整个机构中的运动部件的正常运动。
另外，在实际的结构中，光阑1往往有多个，为了可以简化结构、方便布局，本公开实施例的光阑位置检测装置可以一次检测多个光阑1的位置信息。例如，如图1所示，光阑1为两个，分别与弧形齿圈8的两端配合，这样两个光阑1共用一个弧形齿圈8和一个直线导向件31，对应的其他部件(例如滑动件32和位移传感器4)均为两个。以两个光阑1的情况为例，为了方便布局，且使光阑1的运动更加平稳，如图4和图5所示，连接杆2可以贯穿光阑1，且两端都具有轴承5， 对应的弧形齿圈8也为两个，且两个弧形齿圈8上均具有与连接件2两端的轴承5配合的轨道；相应的，可以对应两个弧形齿圈8在光阑1的两侧设置两个旋转齿轮7，且两个旋转齿轮7分别与两个弧形齿圈8配合。这样，使光阑1沿弧形齿圈8进行弧线运动的过程中更加平稳。
以上仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以权利要求所述的保护范围为准。

Claims (12)

  1. 一种光阑位置检测装置，用于检测做弧形运动的光阑的位置信息，其特征在于，包括连接件、转换机构和位移传感器，其中，所述连接件固定在所述光阑上，所述转换机构的输入端与所述连接件连接，当所述连接件随所述光阑做弧形运动时，所述转换机构将所述连接件的弧形运动转换为直线运动，所述位移传感器与所述转换机构的输出端连接，用于检测所述转换机构的输出端直线运动的位移信息。
  2. 根据权利要求1所述的光阑位置检测装置，其特征在于，所述转换机构包括沿第一方向延伸的直线导向件以及可沿所述直线导向件滑动的滑动件，其中，所述滑动件上沿第二方向开设有第一滑槽和第二滑槽，所述连接件的端部配合伸入所述第一滑槽内，所述位移传感器与所述第二滑槽连接，所述第二方向与所述第一方向垂直。
  3. 根据权利要求2所述的光阑位置检测装置，其特征在于，所述第一滑槽沿所述第二方向延伸的距离大于或等于所述连接杆弧形运动时在所述第二方向上的位移。
  4. 根据权利要求2所述的光阑位置检测装置，其特征在于，所述连接件的端部套设有轴承，所述轴承的外壁与所述第一滑槽沿第二方向延伸的内壁抵靠。
  5. 根据权利要求4所述的光阑位置检测装置，其特征在于，所述轴承为滚动轴承。
  6. 根据权利要求2～5中任一项所述的光阑位置检测装置，其特征在于，所述位移传感器包括可变电阻滑轨和伸出轴，所述可变电阻滑轨沿所述第二方向延伸，所述伸出轴的第一端可沿所述可变电阻滑轨滑动，第二端与所述滑动件的所述第二滑槽连接。
  7. 根据权利要求1所述的光阑位置检测装置，其特征在于，所述转换机构包括连杆和滑块，所述连杆的一端与所述连接件铰接，另一端与所述滑块铰接，所述滑块与所述位移传感器连接。
  8. 根据权利要求1所述的光阑位置检测装置，其特征在于，所述位移传感器为直线位移传感器。
  9. 一种医用加速器治疗头，包括至少一个光阑，所述光阑做弧形运动，其特征在于，包括权利要求1～8中任一项所述的光阑位置检测装置。
  10. 根据权利要求9所述的医用加速器治疗头，其特征在于，还包括电机、旋转齿轮和弧形齿圈，其中，所述旋转齿轮与所述光阑连接，在所述电机的驱动下，所述旋转齿轮可沿所述弧形齿圈做弧形运动。
  11. 根据权利要求10所述的医用加速器治疗头，其特征在于，还包括弧形齿圈安装座，所述弧形齿圈安装于所述弧形齿圈安装座上。
  12. 根据权利要求11所述的医用加速器治疗头，其特征在于，所述光阑位置检测装置的直线导向件固定在所述弧形齿圈安装座上。
PCT/CN2019/091163 2018-11-20 2019-06-13 光阑位置检测装置及医用加速器治疗头 WO2020103437A1 (zh)

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