WO2016161923A1 - 一种用于放射治疗设备的光栅装置及其控制方法及放射治疗设备 - Google Patents

一种用于放射治疗设备的光栅装置及其控制方法及放射治疗设备 Download PDF

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Publication number
WO2016161923A1
WO2016161923A1 PCT/CN2016/078419 CN2016078419W WO2016161923A1 WO 2016161923 A1 WO2016161923 A1 WO 2016161923A1 CN 2016078419 W CN2016078419 W CN 2016078419W WO 2016161923 A1 WO2016161923 A1 WO 2016161923A1
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Prior art keywords
grating
blade
initial position
blades
grating blade
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PCT/CN2016/078419
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English (en)
French (fr)
Inventor
姚毅
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苏州雷泰医疗科技有限公司
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Priority to US15/552,571 priority Critical patent/US10569103B2/en
Publication of WO2016161923A1 publication Critical patent/WO2016161923A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • 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
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
    • 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
    • A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
    • 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
    • A61N5/1045—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2505/00—Evaluating, monitoring or diagnosing in the context of a particular type of medical care
    • A61B2505/05—Surgical care
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/70—Means for positioning the patient in relation to the detecting, measuring or recording means
    • A61B5/704—Tables
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0626—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
    • A61N2005/1092—Details
    • 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
    • A61N2005/1092—Details
    • A61N2005/1095—Elements inserted into the radiation path within the system, e.g. filters or wedges

Definitions

  • the present invention relates to a grating device for a radiation therapy apparatus, a control method therefor, and a radiation therapy apparatus.
  • Radiation medical equipment is widely used, and the grating blade device for fitting the shape of the lesion and defining the radiation field has been greatly developed, including the structural shape and arrangement of the blade, and the accuracy of fitting the field is continuously improved, but
  • the precise position control of the grating blades driven by the motor is difficult to grasp.
  • the motor drive system itself has a natural defect, such as screw transmission error, motor instability, etc., thus resulting in a fitting shot.
  • the accuracy of the field cannot be further improved, and the verification of the equipment is complicated and difficult.
  • an object of the present invention is to provide a grating device, a control method thereof, and a radiation diagnosis and treatment device which are simple in inspection and can improve the accuracy of field projection.
  • a grating device for a radiation therapy device comprising a grating blade and a driving device thereof, further comprising:
  • a tail position controller for monitoring whether the end of the grating blade reaches a preset zero position, that is, an initial position
  • the front end position controller is configured to monitor whether the front end of the grating blade reaches the intermediate position.
  • the front ends of the two sets of grating blades are projected into two parallel straight lines, and the intermediate position is two sets of gratings. A straight line equidistant from the front end of the blade.
  • the tail position controller and the front end position controller can simultaneously verify the tail position and the intermediate position of the single grating blade, and measure the time from the tail position to the intermediate position and/or the total rotation of the motor at any time.
  • Number since the distance between the end position and the intermediate position is determined to be constant and can be accurately measured, therefore, the system is accurate Verification and control of a certain grating blade to a certain specified position, because the grating blade can be easily verified and controlled one by one, it can effectively overcome the transmission error and performance instability brought by different grating blade driving systems. The error can even be checked once before each fitting of the field, and then precise control can be achieved based on the latest measured actual parameters.
  • the grating device for the radiotherapy apparatus is further provided with a central controller, and the central controller is respectively connected with the driving device, the tail position controller and the front end position controller, and the central control The device receives the data from the tail position controller and the front end position controller, and makes a judgment according to the determination and sends a control command to the driving device, and the driving device controls the grating blade to move or stop.
  • a front end position sensor is disposed at a front end of the grating blade, that is, a free end, and the front end position sensor is triggered when the front ends of the corresponding two grating blades of the two sets of grating blades touch.
  • the front end of the grating blade that is, the free end
  • the position corresponding to the intermediate line on the grating device are respectively provided with matching front end position sensors, and when the front end of a certain grating blade reaches the intermediate line, the front end position sensor is triggered.
  • a front end of each of the grating blades of the grating device is provided with a transverse through hole, a movable part of the front end position sensor is disposed in the through hole, and a fixing part of the front end position sensor is disposed on the grating
  • the front end of the grating blade is located at exactly Said the middle line.
  • the front end position controller includes:
  • a driving component disposed on the grating body and driving the limiting rod to perform a horizontal telescopic movement
  • Two limiting rods can be horizontally stretched independently along the middle line, respectively corresponding to two sets of grating blades of the grating device;
  • the front end position sensor is disposed on the limiting rod and faces the front end of the grating blade.
  • the front end position sensor corresponds to all the grating blades one by one, when a certain grating blade Touching its corresponding front end position sensor Thereafter, the front end position sensor is triggered, and the front end of the grating blade is now located on the intermediate line.
  • the present invention also provides a control method for a grating device for a radiotherapy apparatus, the control method including but not limited to the following conditions:
  • Initial position verification when the tail controller independently sets the initial position sensor for each piece of grating blade, the initial position verification method is to independently check the initial position of each grating blade based on the detection data of each initial position sensor. Or controlling some or all of them to return to the initial position simultaneously or separately; when each set of grating blades is only provided with an initial position sensor, the initial position verification method is to first drive all the grating blades away from the initial position, and then first The grating blades to be verified are moved to the initial position until the initial position sensor is triggered, the initial position mark is made, the initial position verification of the first grating blade is completed, and then the grating blade is driven away from the initial position, and then the same The program verifies the initial position of the second grating blade until the verification of the initial position of all the grating blades is completed;
  • the intermediate position check is performed by setting the intermediate position sensor at the intermediate position according to claim 1, first driving all the grating blades away from the intermediate position, and then moving the first grating blade to be verified to the middle. The position moves until the intermediate position sensor is triggered, the intermediate position mark is made, the intermediate position check of the first grating blade is completed, then the grating blade is driven away from the intermediate position, and then the second grating blade is verified according to the same procedure. Intermediate position until the verification of the intermediate position of all grating blades is completed;
  • the precise positioning of the grating blade and the precise positioning of the grating blade include the following steps: the first step, the initial position verification and the intermediate position verification are completed, and the distance L between the initial position and the intermediate position is known or actually measured; Step, driving a grating blade to move from the initial position to the intermediate position or from the intermediate position to the initial position, recording the running time T or the number of motor revolutions S; in the third step, returning the grating blade to the initial position, the mark is zero In the fourth step, the grating blade is moved from the initial position to the intermediate position, and the time t or the number of revolutions s is recorded.
  • control method further includes, but is not limited to, the following conditions:
  • Front end position check the front end position, that is, when one of the two sets of grating blades is in the initial position, the end face of the grating blade near the intermediate position, that is, the end of the free end
  • the position is the front end position of the grating blade corresponding to the grating blade in the other set of grating blades, that is, the extreme position at which a certain grating blade can move forward
  • the front end position verification method is at the front end of the grating blade That is, the free end is provided with a front end position sensor, which first drives a certain set of grating blades or a single grating blade of another group corresponding to the grating blade to be verified back to the initial position, and then the first grating blade to be verified is directed
  • the front end position moves until the front end position sensor is triggered, the front end position mark is made, the front end position check of the first grating blade is completed, and then the front end position of the second grating blade is verified according to the same procedure
  • control method further includes, but is not limited to, the following conditions:
  • the present invention also provides a radiation therapy apparatus comprising a large frame and an accelerator disposed on the large frame, and further comprising the above-described grating device.
  • 1 to 2 are schematic views of the present invention.
  • FIG. 3 is a schematic view of an embodiment of the present invention.
  • a grating device 10 for a radiation therapy device comprising a grating blade 1 and its driving device 2, further comprising:
  • a tail position controller 5 for monitoring whether the tail end of the grating blade 1 reaches a preset zero position, that is, an initial position
  • the front end position controller 6 is configured to monitor whether the front end of the grating blade 1 reaches the intermediate position.
  • the front ends of the two sets of the grating blades 1 are projected as two parallel straight lines, and the intermediate position is A straight line equidistant from the front ends of the two sets of grating blades.
  • the radiotherapy apparatus generally comprises a large frame 7, an accelerator 8, a grating device 10 and a treatment bed 20.
  • the light-limiting tube holder 9 and the light-limiting tube 91 are optional devices, and are required to be used according to the treatment of patients.
  • the shape and size of the lesion control the relative motion of the grating blades 1 on both sides of the grating device, and the front ends cooperate to fit the shape of the lesion to form a window to control the accelerator beam field, as shown in FIG.
  • the tail position controller 5 and the front end position controller 6 can simultaneously check the tail end position and the intermediate position of the single grating blade 1 and measure the time when a certain grating blade 1 reaches the intermediate position from the tail end position and/or at any time.
  • the total number of revolutions of the motor since the distance between the end position and the intermediate position is determined and can be accurately measured, therefore, the system accurately verifies and controls a certain grating blade 1 to reach a precisely specified position. Since the calibration and control of the grating blades 1 can be conveniently realized, the error caused by the transmission error and the performance instability caused by the different grating blade driving systems can be effectively overcome, and even before each fitting of the shooting field Make a check and then achieve precise control based on the latest measured actual parameters.
  • control system can be implemented by using various control systems in the prior art, or a central controller can be provided in the grating device for the radiotherapy apparatus, the central controller and the driving device 2,
  • the tail end position controller 5 and the front end position controller 6 are respectively connected, and the central controller receives the data transmitted from the tail end position controller 5 and the front end position controller 6, and makes a judgment and drive according to the same.
  • the device issues a control command, and the drive device 2 controls the grating blade 1 to move or stop.
  • the end position controller 5 and the front end position controller 6 can detect whether the front end and the tail end of the grating blade 1 reach a certain position by using an electromagnetic sensor, a micro switch, a photoelectric sensor, etc., for example, a grating leaf can be used.
  • a baseline sensor is provided at the end of the chip end, and a sensor or a detection switch can be provided for each of the grating blades.
  • the initial position verification method is to independently check the initial position of each grating blade or control them in accordance with the detection data of each initial position sensor.
  • the initial position verification method is to first drive all the grating blades away from the initial position, and then the first one to be verified.
  • the grating blade moves to the initial position until the initial position sensor is triggered, the initial position mark is made, the initial position verification of the first grating blade is completed, then the grating blade is driven away from the initial position, and then the second program is verified according to the same procedure.
  • the initial position of the grating blades until the verification of the initial position of all the grating blades is completed.
  • the intermediate position The verification method is to set an intermediate position sensor (such as an infrared sensor, a laser sensor, etc.) in the middle position, first drive all the grating blades away from the intermediate position, and then move the first grating blade to be verified to the intermediate position until Trigger the intermediate position sensor, mark the middle position, complete the first light
  • the intermediate position of the grid blade is verified, after which the grating blade is driven away from the intermediate position, and then the intermediate position of the second grating blade is verified according to the same procedure until the verification of the intermediate position of all the grating blades is completed;
  • the precise positioning of the grating blade and the precise positioning of the grating blade include the following steps: the first step, the initial position verification and the intermediate position verification are completed, and the distance L between the initial position and the intermediate position is known or actually measured; Step, driving a grating blade to move from the initial position to the intermediate position or from the intermediate position to the initial position, recording the running time T or the number of motor revolutions S; in the third
  • Front end position check the so-called front end position, that is, when one of the two sets of grating blades is in the initial position, the end face of the grating blade near the intermediate position is the free end end face.
  • the position of the front end of the grating blade corresponding to the grating blade in another set of grating blades that is, the extreme position at which a certain grating blade can move forward
  • the method of verifying the front end position is in the grating blade
  • the front end ie the free end, is provided with a front end position sensor, which first drives a certain set of grating blades or a single set of grating blades corresponding to the grating blades to be verified back to the initial position, and then the first grating to be verified
  • the blade moves to the front end position until the front end position sensor is triggered, the front end position mark is made, the front end position check of the first grating blade is completed, and then the front end position of the second grating blade is verified according to
  • Grating blade moving speed check or motor parameter check including the following steps: First step, complete initial position check and intermediate position check, and know or actually measure the distance between the initial position and the intermediate position L
  • the second step is to drive a certain grating blade to move from the initial position to the intermediate position or from the intermediate position to the initial position, and record the running time T or the number of motor revolutions S; in the third step, the measured running time T or the motor is turned The number S is compared with the previously stored running time T or the number of motor revolutions S.
  • the prompts are the same, if different, Including at least one of the following steps: one of the prompts is different; the second is to perform the above steps after the training or maintenance; the third is to store the newly measured running time T or the number of motor revolutions S, instead of the original parameters
  • the front end position sensor may be disposed on both sides of the middle position of the two sets of grating blades, and the red sensor or the laser sensor or the like is used, that is, the two sets of grating blades share a set of intermediate position sensors, and the intermediate positions of each of the grating blades need to be verified one by one. It is also possible to provide an intermediate position detecting device on each of the grating blades, for example, a front end position sensor (such as an electromagnetic sensor or a micro switch) is provided at the front end, that is, the free end of the grating blade 1, when the corresponding two grating blades of the two sets of grating blades are The front end position sensor is triggered after the front end touches. This allows multiple grating blades to be verified simultaneously.
  • a front end position sensor such as an electromagnetic sensor or a micro switch
  • the present invention also provides a control method for a grating device for a radiotherapy apparatus, the control method including but not limited to the following conditions:
  • Initial position verification when the tail controller independently sets the initial position sensor for each piece of grating blade, the initial position verification method is to independently check the initial position of each grating blade based on the detection data of each initial position sensor. Or controlling some or all of them to return to the initial position simultaneously or separately; when each set of grating blades is only provided with an initial position sensor, the initial position verification method is to first drive all the grating blades away from the initial position, and then first The grating blades to be verified are moved to the initial position until the initial position sensor is triggered, the initial position mark is made, the initial position verification of the first grating blade is completed, and then the grating blade is driven away from the initial position, and then the same The program verifies the initial position of the second grating blade until the verification of the initial position of all the grating blades is completed.
  • the intermediate position check is performed by setting the intermediate position sensor at the intermediate position according to claim 1, first driving all the grating blades away from the intermediate position, and then moving the first grating blade to be verified to the middle. The position moves until the intermediate position sensor is triggered, the intermediate position mark is made, the intermediate position check of the first grating blade is completed, then the grating blade is driven away from the intermediate position, and then the second grating blade is verified according to the same procedure. The intermediate position until the verification of the intermediate position of all the grating blades is completed.
  • the precise positioning of the grating blade and the precise positioning of the grating blade include the following steps: the first step, the initial position verification and the intermediate position verification are completed, and the distance L between the initial position and the intermediate position is known or actually measured; Step, driving a grating blade to move from the initial position to the intermediate position or from the intermediate position to the initial position, recording the running time T or the number of motor revolutions S; in the third step, returning the grating blade to the initial position, the mark is zero In the fourth step, the grating blade is moved from the initial position to the intermediate position, and the time t or the number of revolutions s is recorded.
  • control method further includes, but is not limited to, the following conditions:
  • Front end position check the front end position, that is, when one of the two sets of grating blades is in the initial position, the end face of the grating blade near the intermediate position, that is, the end of the free end
  • the position is the front end position of the grating blade corresponding to the grating blade in the other set of grating blades, that is, the extreme position at which a certain grating blade can move forward
  • the front end position verification method is at the front end of the grating blade That is, the free end is provided with a front end position sensor, which first drives a certain set of grating blades or a single grating blade of another group corresponding to the grating blade to be verified back to the initial position, and then the first grating blade to be verified is directed
  • the front end position moves until the front end position sensor is triggered, the front end position mark is made, the front end position check of the first grating blade is completed, and then the front end position of the second grating blade is verified according to the same procedure
  • control method further includes, but is not limited to, the following conditions:
  • the front end position control device may further have a scheme of, for example, respectively providing a front end position sensor at a front end of the grating blade, that is, a free end, and a position corresponding to the intermediate line on the grating device, when a certain grating blade is used.
  • the front end position sensor is triggered when the front end reaches the middle line.
  • a lateral through hole may be disposed at a front end of each of the grating blades of the grating device, and a movable member of the front end position sensor is disposed in the through hole, and a fixing member of the front end position sensor is disposed on the grating
  • the front end of the grating blade is located at exactly Said the middle line.
  • a front end position controller is disposed on the bracket of the grating device, including:
  • a driving component 61 is disposed on the grating body and drives the limiting rod to perform a horizontal telescopic movement
  • Two limiting rods 62 can be horizontally stretched independently along the middle line, respectively corresponding to two sets of grating blades of the grating device; for example, when the grating blade on the left side is to be verified, the limiting rod on the right side of the driving is moved to
  • the grating blade active area is substantially in that the limiting rod is located on the other side of the intermediate line such that the front end of the front end position sensor is located on the intermediate line, and when the grating blade moves toward the intermediate line and reaches the intermediate line, the corresponding blade is triggered.
  • the other limit bar corresponds to another set of grating blades and works the same way.
  • the front end position sensor is disposed on the limiting rod 62 and faces the side of the front end of the grating blade. After the limit lever 62 is completely moved to the working area of the grating blade, the front end position sensor has a one-to-one correspondence with all the grating blades, and when a certain grating blade touches its corresponding front end position sensor, the front end position sensor is triggered, and The front end of the grating blade is now located on the intermediate line.
  • limiting rods In order to reduce the length of the single limiting rod 62, four limiting rods can be arranged in pairs from opposite sides, and each pair of limiting rods is combined, which is equivalent to one limiting rod.
  • the utility model has the advantages of simple structure, no need to modify the grating blade, low production cost, and can verify the verification of a certain group of grating blades or a single working blade, and the efficiency is higher.
  • the present invention also provides a radiotherapy apparatus comprising a large frame and an accelerator disposed on the large frame, and further comprising the above-described grating device, as shown in FIG.

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Abstract

一种用于放射治疗设备的光栅装置（10），同时设置尾端位置控制器（5）和前端位置控制器（6）可以同时校验单一光栅叶片（1）的尾端位置及中间位置，以及随时测量某一光栅叶片（1）从尾端位置到达中间位置的时间和/或电机的总转数，由于尾端位置和中间位置之间的距离是确定不变的，并可精确测量的，因此可以精确验证和控制某一光栅叶片（1）到达某一精确指定的位置，由于可以方便的实现对光栅叶片（1）的逐一校验和控制，因此可以有效克服不同光栅叶片（1）驱动系统带来的传动误差和性能不稳定带来的误差，甚至可以在每次拟合射野前做一次校验，然后根据最新测得的实际参数来实现精确的控制。

Description

一种用于放射治疗设备的光栅装置及其控制方法及放射治疗设备 技术领域
本发明涉及一种用于放射治疗设备的光栅装置及其控制方法及放射治疗设备。
背景技术
放射医疗设备应用广泛，其中用于拟合病灶形状、限定射线射野的光栅叶片装置得到很大的发展，包括叶片的结构形状及其排布，拟合射野的精度在不断的提高，但是在现有技术中，由电机驱动的光栅叶片的精确位置控制难以掌握，一方面电机驱动系统本身就带有天然的欠缺，如螺杆的传递误差、电机的不稳定性等，因此导致拟合射野的精度无法进一步得到提升，设备的校验也很复杂困难。
发明内容
为解决上述问题，本发明的目的在于提供一种检验简单，可以提高射野拟合精度的光栅装置及其控制方法及放射诊疗设备。
为达到上述目的，本发明的技术方案是：
一种用于放射治疗设备的光栅装置，包括光栅叶片及其驱动装置，还包括：
尾端位置控制器，用于监控光栅叶片尾端是否到达预设的零位，即初始位置；
前端位置控制器，用于监控光栅叶片前端是否到达中间位置，当两组光栅叶片均处于初始位置时，两组光栅叶片的前端投影为两条平行的直线，所述中间位置是与两组光栅叶片前端等距的一条直线。
同时设置尾端位置控制器和前端位置控制器可以同时校验单一光栅叶片的尾端位置及中间位置，以及随时测量某一光栅叶片从尾端位置到达中间位置的时间和/或电机的总转数，由于尾端位置和中间位置之间的距离是确定不变的，并可精确测量的，因此，本系统为精确 验证和控制某一光栅叶片到达某一精确指定的位置，由于可以方便的实现对光栅叶片的逐一校验和控制，因此可以有效克服不同光栅叶片驱动系统带来的传动误差和性能不稳定带来的误差，甚至可以在每次拟合射野前做一次校验，然后根据最新测得的实际参数来实现精确的控制。
进一步的，所述用于放射治疗设备的光栅装置还设有中央控制器，所述中央控制器与所述驱动装置、所述尾端位置控制器及前端位置控制器分别连接，所述中央控制器接收所述尾端位置控制器及前端位置控制器传来的数据，并据此做出判断及向驱动装置发出控制指令，由驱动装置控制所述光栅叶片移动或停止。
进一步的，在光栅叶片的前端即自由端设置前端位置传感器，当两组光栅叶片中对应的两个光栅叶片的前端碰触后触发前端位置传感器。
进一步的，在光栅叶片的前端即自由端以及在光栅装置上对应于中间线的位置分别设置相互匹配的前端位置传感器，当某一片光栅叶片的前端到达中间线时，触发所述前端位置传感器。
进一步的，所述光栅装置的每片光栅叶片的前端设置有一个横向贯通的通孔，所述前端位置传感器的活动部件设置于所述通孔中，所述前端位置传感器的固定部件设置在光栅叶片一侧或两侧的光栅叶片的支架上，当某一片光栅叶片上的前端位置传感器的活动部件与所述固定部件处于同一直线上并触发前端位置传感器时，该光栅叶片的前端正好位于所述中间线上。
进一步的，所述前端位置控制器包括：
驱动部件，设置于所述光栅本体上，驱动限位杆做水平伸缩运动；
两个限位杆，可独立沿所述中间线水平伸缩，分别对应于光栅装置的两组光栅叶片；
前端位置传感器，设于限位杆上并面向光栅叶片前端的一侧，当限位杆完全移动到光栅叶片工作区后，所述前端位置传感器与所有光栅叶片一一对应，当某一片光栅叶片碰触到其对应的前端位置传感器 后，触发该前端位置传感器，并且该光栅叶片的前端此时位于所述中间线上。
本发明还提供一种用于放射治疗设备的光栅装置的控制方法，所述控制方法包括但不限于以下工况：
初始位置校验，当尾端控制器为每一片光栅叶片均独立设有初始位置传感器时，初始位置校验的方法是根据每一个初始位置传感器的检测数据独立校验每个光栅叶片的初始位置或控制它们中的一部分或全部同时或分别回归初始位置；当每组光栅叶片只设置一个初始位置传感器时，初始位置校验的方法是，先将所有光栅叶片驱动离开初始位置，然后将第一个需要校验的光栅叶片向初始位置移动，直到触发初始位置传感器，做好初始位置标记，完成第一个光栅叶片的初始位置校验，之后将该光栅叶片驱动离开初始位置，然后按照相同的程序校验第二个光栅叶片的初始位置，直到完成所有的光栅叶片的初始位置的校验；
中间位置校验，中间位置校验的方法是，在权利要求1所述的中间位置设置中间位置传感器，先将所有光栅叶片驱动离开中间位置，然后将第一个需要校验的光栅叶片向中间位置移动，直到触发中间位置传感器，做好中间位置标记，完成第一个光栅叶片的中间位置校验，之后将该光栅叶片驱动离开中间位置，然后按照相同的程序校验第二个光栅叶片的中间位置，直到完成所有的光栅叶片的中间位置的校验；
光栅叶片精确定位，光栅叶片精确定位的方法包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，让该光栅叶片回归初始位置，此时标记为零；第四步，让该光栅叶片从初始位置开始向中间位置移动，同时记录时间t或转数s，此时该光栅叶片的实时位置即实际移动距离为I＝Lt/T或I＝Ls/S，当I等于预设的数值或需要的数值时即该光栅叶片到达目标 位置，即可停止移动。
进一步的，所述控制方法还包括但不限于以下工况：
前端位置校验，所谓前端位置，即，当两组光栅叶片中某一组光栅叶片中的某一片光栅叶片处于初始位置时，该光栅叶片的靠近中间位置一侧的端面即自由端端面所在的位置，就是另一组光栅叶片中的对应于该光栅叶片的光栅叶片的前端位置，即某一光栅叶片能够向前移动的极限位置，所述前端位置校验的方法是，在光栅叶片的前端即自由端设置前端位置传感器，先将某一组光栅叶片或待校验的光栅叶片对应位置的另一组的单一光栅叶片驱动回到初始位置，然后将第一个需要校验的光栅叶片向前端位置移动，直到触发前端位置传感器，做好前端位置标记，完成第一个光栅叶片的前端位置校验，然后按照相同的程序校验第二个光栅叶片的前端位置，直到完成所有的光栅叶片的前端位置的校验。
进一步的，所述控制方法还包括但不限于以下工况：
光栅叶片移动速度校验或电机参数校验，包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，将测得的运行时间T或电机转数S与之前存储的运行时间T或电机转数S进行比较，如果相同则提示相同，如不同，则包括以下步骤中的至少一种步骤：其一提示不同；其二进行调教或维修后重新上述步骤；其三是将新测得运行时间T或电机转数S进行存储，取代原有参数纳入实时位置的技术公式I＝Lt/T或I＝Ls/S当中。
本发明还提供一种放射治疗设备，包括大机架和设于大机架上的加速器，还包括上述的光栅装置。
附图说明
图1到图2是本发明的示意图。
图3是本实用新型的一种实施方式的示意图。
图中数字和字母所表示的相应部件名称：
1、光栅叶片 2、驱动装置 4、适配器 5、尾端位置控制器 6、前端位置控制器 7、大机架 8、加速器 9、限光筒支架 91、限光筒 10光栅装置 20、治疗床 61、驱动部件 62、限位杆
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细的说明。
如图1和图2所示的一种实施方式，展示了一种用于放射治疗设备的光栅装置10，包括光栅叶片1及其驱动装置2，还包括：
尾端位置控制器5，用于监控光栅叶片1尾端是否到达预设的零位，即初始位置；
前端位置控制器6，用于监控光栅叶片1前端是否到达中间位置，当两组光栅叶片1均处于初始位置时，两组光栅叶片1的前端投影为两条平行的直线，所述中间位置是与两组光栅叶片前端等距的一条直线。
在图2中，放射治疗设备一般包括大机架7、加速器8、光栅装置10和治疗床20，限光筒支架9及限光筒91属于可选装置，在治疗病患时，需要先根据病灶的形状和大小控制光栅装置两侧的光栅叶片1相对运动，其前端共同配合对病灶形状进行拟合，形成一个窗口以控制加速器射线射野，如图1中所示。同时设置尾端位置控制器5和前端位置控制器6可以同时校验单一光栅叶片1的尾端位置及中间位置，以及随时测量某一光栅叶片1从尾端位置到达中间位置的时间和/或电机的总转数，由于尾端位置和中间位置之间的距离是确定不变的，并可精确测量的，因此，本系统为精确验证和控制某一光栅叶片1到达某一精确指定的位置，由于可以方便的实现对光栅叶片1的逐一校验和控制，因此可以有效克服不同光栅叶片驱动系统带来的传动误差和性能不稳定带来的误差，甚至可以在每次拟合射野前做一次校验，然后根据最新测得的实际参数来实现精确的控制。
在实际应用中，控制系统可以采用现有技术中的多种控制系统来实现，也可在用于放射治疗设备的光栅装置设置中央控制器，所述中央控制器与所述驱动装置2、所述尾端位置控制器5及前端位置控制器6分别连接，所述中央控制器接收所述尾端位置控制器5及前端位置控制器6传来的数据，并据此做出判断及向驱动装置发出控制指令，由驱动装置2控制所述光栅叶片1移动或停止。
在实际应用中，尾端位置控制器5及前端位置控制器6可以采用电磁传感器、微动开关、光电传感器等器件检测光栅叶片1前端和尾端是否到达某一特定位置，例如，可以光栅叶片尾端初始位置设置一个基准线传感器，也可以对应每一片光栅叶片设置一个传感器或检测开关。当尾端控制器为每一片光栅叶片均独立设有初始位置传感器时，初始位置校验的方法是根据每一个初始位置传感器的检测数据独立校验每个光栅叶片的初始位置或控制它们中的一部分或全部同时或分别回归初始位置；当每组光栅叶片只设置一个初始位置传感器时，初始位置校验的方法是，先将所有光栅叶片驱动离开初始位置，然后将第一个需要校验的光栅叶片向初始位置移动，直到触发初始位置传感器，做好初始位置标记，完成第一个光栅叶片的初始位置校验，之后将该光栅叶片驱动离开初始位置，然后按照相同的程序校验第二个光栅叶片的初始位置，直到完成所有的光栅叶片的初始位置的校验。
为了校验某一光栅叶片1是否到达中间位置，以及从初始位置到达中间位置需要的时间或者驱动电机的转数，需要设置检测光栅叶片到达中间位置的检测装置，初始位置和中间位置都是确定的位置，因此初始位置和中间位置之间的距离可以预先测量并存储于设备的控制器中，为了检测光栅叶片是否到达中间位置，也可以采用各种传感器及微动开关，举例说明，中间位置校验的方法是，在中间位置设置中间位置传感器(如红外传感器、激光传感器等)，先将所有光栅叶片驱动离开中间位置，然后将第一个需要校验的光栅叶片向中间位置移动，直到触发中间位置传感器，做好中间位置标记，完成第一个光 栅叶片的中间位置校验，之后将该光栅叶片驱动离开中间位置，然后按照相同的程序校验第二个光栅叶片的中间位置，直到完成所有的光栅叶片的中间位置的校验；接下来对光栅叶片精确定位，光栅叶片精确定位的方法包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，让该光栅叶片回归初始位置，此时标记为零；第四步，让该光栅叶片从初始位置开始向中间位置移动，同时记录时间t或转数s，此时该光栅叶片的实时位置即实际移动距离为I＝Lt/T或I＝Ls/S，当I等于预设的数值或需要的数值时即该光栅叶片到达目标位置，即可停止移动。
本发明提供的技术方案还可以解决以下技术问题：
1、前端位置校验，所谓前端位置，即，当两组光栅叶片中某一组光栅叶片中的某一片光栅叶片处于初始位置时，该光栅叶片的靠近中间位置一侧的端面即自由端端面所在的位置，就是另一组光栅叶片中的对应于该光栅叶片的光栅叶片的前端位置，即某一光栅叶片能够向前移动的极限位置，所述前端位置校验的方法是，在光栅叶片的前端即自由端设置前端位置传感器，先将某一组光栅叶片或待校验的光栅叶片对应位置的另一组的单一光栅叶片驱动回到初始位置，然后将第一个需要校验的光栅叶片向前端位置移动，直到触发前端位置传感器，做好前端位置标记，完成第一个光栅叶片的前端位置校验，然后按照相同的程序校验第二个光栅叶片的前端位置，直到完成所有的光栅叶片的前端位置的校验。
2、光栅叶片移动速度校验或电机参数校验，包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，将测得的运行时间T或电机转数S与之前存储的运行时间T或电机转数S进行比较，如果相同则提示相同，如不同， 则包括以下步骤中的至少一种步骤：其一提示不同；其二进行调教或维修后重新上述步骤；其三是将新测得运行时间T或电机转数S进行存储，取代原有参数纳入实时位置的技术公式I＝Lt/T或I＝Ls/S当中。
前端位置传感器可以设置在两组光栅叶片的中间位置的两侧，使用红传感器或激光传感器等，即两组光栅叶片共用一组中间位置传感器，每片光栅叶片的中间位置需要逐一校验。也可以每片光栅叶片上设置中间位置检测装置，比如在光栅叶片1的前端即自由端设置前端位置传感器(如电磁传感器或微动开关)，当两组光栅叶片中对应的两个光栅叶片的前端碰触后触发前端位置传感器。这样就可以同时校验多片光栅叶片了。
本发明还提供一种用于放射治疗设备的光栅装置的控制方法，所述控制方法包括但不限于以下工况：
初始位置校验，当尾端控制器为每一片光栅叶片均独立设有初始位置传感器时，初始位置校验的方法是根据每一个初始位置传感器的检测数据独立校验每个光栅叶片的初始位置或控制它们中的一部分或全部同时或分别回归初始位置；当每组光栅叶片只设置一个初始位置传感器时，初始位置校验的方法是，先将所有光栅叶片驱动离开初始位置，然后将第一个需要校验的光栅叶片向初始位置移动，直到触发初始位置传感器，做好初始位置标记，完成第一个光栅叶片的初始位置校验，之后将该光栅叶片驱动离开初始位置，然后按照相同的程序校验第二个光栅叶片的初始位置，直到完成所有的光栅叶片的初始位置的校验。
中间位置校验，中间位置校验的方法是，在权利要求1所述的中间位置设置中间位置传感器，先将所有光栅叶片驱动离开中间位置，然后将第一个需要校验的光栅叶片向中间位置移动，直到触发中间位置传感器，做好中间位置标记，完成第一个光栅叶片的中间位置校验，之后将该光栅叶片驱动离开中间位置，然后按照相同的程序校验第二个光栅叶片的中间位置，直到完成所有的光栅叶片的中间位置的校验。
光栅叶片精确定位，光栅叶片精确定位的方法包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，让该光栅叶片回归初始位置，此时标记为零；第四步，让该光栅叶片从初始位置开始向中间位置移动，同时记录时间t或转数s，此时该光栅叶片的实时位置即实际移动距离为I＝Lt/T或I＝Ls/S，当I等于预设的数值或需要的数值时即该光栅叶片到达目标位置，即可停止移动。
进一步的，所述控制方法还包括但不限于以下工况：
前端位置校验，所谓前端位置，即，当两组光栅叶片中某一组光栅叶片中的某一片光栅叶片处于初始位置时，该光栅叶片的靠近中间位置一侧的端面即自由端端面所在的位置，就是另一组光栅叶片中的对应于该光栅叶片的光栅叶片的前端位置，即某一光栅叶片能够向前移动的极限位置，所述前端位置校验的方法是，在光栅叶片的前端即自由端设置前端位置传感器，先将某一组光栅叶片或待校验的光栅叶片对应位置的另一组的单一光栅叶片驱动回到初始位置，然后将第一个需要校验的光栅叶片向前端位置移动，直到触发前端位置传感器，做好前端位置标记，完成第一个光栅叶片的前端位置校验，然后按照相同的程序校验第二个光栅叶片的前端位置，直到完成所有的光栅叶片的前端位置的校验。
进一步的，所述控制方法还包括但不限于以下工况：
光栅叶片移动速度校验或电机参数校验，包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，将测得的运行时间T或电机转数S与之前存储的运行时间T或电机转数S进行比较，如果相同则提示相同，如不同，则包括以下步骤中的至少一种步骤：其一提示不同；其二进行调教或维修后 重新上述步骤；其三是将新测得运行时间T或电机转数S进行存储，取代原有参数纳入实时位置的技术公式I＝Lt/T或I＝Ls/S当中。
在实际应用中，前端位置控制装置还可以有以下方案，例如，在光栅叶片的前端即自由端以及在光栅装置上对应于中间线的位置分别设置相互匹配的前端位置传感器，当某一片光栅叶片的前端到达中间线时，触发所述前端位置传感器。这样，可以先将光栅装置的两组光栅叶片中的一组运行到中间线位置，然后就可以对另一组光栅叶片进行逐一校验了，校验结束，再将另一组光栅叶片运行到中间线位置，然后校验剩下的另一组光栅叶片。也可以将某一片光栅叶片运行到中间线位置，然后校验与它对应的光栅叶片，按照这个办法，逐一校验所有的光栅叶片。实际应用中，可以在光栅叶片前端钻孔，将传感器安装与孔中，当相对应的光栅叶片碰触时，触发该组传感器。
也可以在所述光栅装置的每片光栅叶片的前端设置有一个横向贯通的通孔，所述前端位置传感器的活动部件设置于所述通孔中，所述前端位置传感器的固定部件设置在光栅叶片一侧或两侧的光栅叶片的支架上，当某一片光栅叶片上的前端位置传感器的活动部件与所述固定部件处于同一直线上并触发前端位置传感器时，该光栅叶片的前端正好位于所述中间线上。
为了节约成本，也可以采用如下简单的方案，如图3所示，在光栅装置的支架上设置前端位置控制器，包括：
驱动部件61，设置于所述光栅本体上，驱动限位杆做水平伸缩运动；
两个限位杆62，可独立沿所述中间线水平伸缩，分别对应于光栅装置的两组光栅叶片；如，当要校验左侧的光栅叶片时，驱动右侧的限位杆移动到光栅叶片活动区，其实质是，该限位杆位于中间线的另一侧，使得前端位置传感器的前端位于中间线上，当光栅叶片向中间线移动并到达中间线时，触发该叶片对应的前端位置传感器。另一个限位杆对应于另外一组光栅叶片，工作原理相同。
前端位置传感器，设于限位杆62上并面向光栅叶片前端的一侧， 当限位杆62完全移动到光栅叶片工作区后，所述前端位置传感器与所有光栅叶片一一对应，当某一片光栅叶片碰触到其对应的前端位置传感器后，触发该前端位置传感器，并且该光栅叶片的前端此时位于所述中间线上。
为了减小单个限位杆62的长度，可以采用4个限位杆从两侧相对成对安置，每对限位杆组合在一起，等同一个限位杆。
本方案结构简单，无需改动光栅叶片，制作成本低，并且可以对某一组光栅叶片同时校验或单独某片工作叶片进行校验，效率更高。
本发明还提供一种放射治疗设备，包括大机架和设于大机架上的加速器，还包括上述的光栅装置，如图2所示。
以上所述的仅是本发明的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。

Claims (10)

  1. 一种用于放射治疗设备的光栅装置，包括光栅叶片及其驱动装置，其特征在于，还包括：
    尾端位置控制器，用于监控光栅叶片尾端是否到达预设的零位，即初始位置；
    前端位置控制器，用于监控光栅叶片前端是否到达中间位置，当两组光栅叶片均处于初始位置时，两组光栅叶片的前端投影为两条平行的直线，所述中间位置是与两组光栅叶片前端等距的一条直线。
  2. 根据权利要求1所述的用于放射治疗设备的光栅装置，其特征在于，所述用于放射治疗设备的光栅装置还设有中央控制器，所述中央控制器与所述驱动装置、所述尾端位置控制器及前端位置控制器分别连接，所述中央控制器接收所述尾端位置控制器及前端位置控制器传来的数据，并据此做出判断及向驱动装置发出控制指令，由驱动装置控制所述光栅叶片移动或停止。
  3. 根据权利要求2所述的用于放射治疗设备的光栅装置，其特征在于，在光栅叶片的前端即自由端设置前端位置传感器，当两组光栅叶片中对应的两个光栅叶片的前端碰触后触发前端位置传感器。
  4. 根据权利要求2所述的用于放射治疗设备的光栅装置，其特征在于，在光栅叶片的前端即自由端以及在光栅装置上对应于中间线的位置分别设置相互匹配的前端位置传感器，当某一片光栅叶片的前端到达中间线时，触发所述前端位置传感器。
  5. 根据权利要求4所述的用于放射治疗设备的光栅装置，其特征在于，所述光栅装置的每片光栅叶片的前端设置有一个横向贯通的通孔，所述前端位置传感器的活动部件设置于所述通孔中，所述前端位置传感器的固定部件设置在光栅叶片一侧或两侧的光栅叶片的支架上，当某一片光栅叶片上的前端位置传感器的活动部件与所述固定部件处于同一直线上并触发前端位置传感器时，该光栅叶片的前端正好位于所述中间线上。
  6. 根据权利要求1所述的用于放射治疗设备的光栅装置，其特征在 于，所述前端位置控制器包括：
    驱动部件，设置于所述光栅本体上，驱动限位杆做水平伸缩运动；
    两个限位杆，可独立沿所述中间线水平伸缩，分别对应于光栅装置的两组光栅叶片；
    前端位置传感器，设于限位杆上并面向光栅叶片前端的一侧，当限位杆完全移动到光栅叶片工作区后，所述前端位置传感器与所有光栅叶片一一对应，当某一片光栅叶片碰触到其对应的前端位置传感器后，触发该前端位置传感器，并且该光栅叶片的前端此时位于所述中间线上。
  7. 一种用于放射治疗设备的光栅装置的控制方法，其特征在于，所述控制方法包括但不限于以下工况：
    初始位置校验，当尾端控制器为每一片光栅叶片均独立设有初始位置传感器时，初始位置校验的方法是根据每一个初始位置传感器的检测数据独立校验每个光栅叶片的初始位置或控制它们中的一部分或全部同时或分别回归初始位置；当每组光栅叶片只设置一个初始位置传感器时，初始位置校验的方法是，先将所有光栅叶片驱动离开初始位置，然后将第一个需要校验的光栅叶片向初始位置移动，直到触发初始位置传感器，做好初始位置标记，完成第一个光栅叶片的初始位置校验，之后将该光栅叶片驱动离开初始位置，然后按照相同的程序校验第二个光栅叶片的初始位置，直到完成所有的光栅叶片的初始位置的校验；
    中间位置校验，中间位置校验的方法是，在权利要求1所述的中间位置设置中间位置传感器，先将所有光栅叶片驱动离开中间位置，然后将第一个需要校验的光栅叶片向中间位置移动，直到触发中间位置传感器，做好中间位置标记，完成第一个光栅叶片的中间位置校验，之后将该光栅叶片驱动离开中间位置，然后按照相同的程序校验第二个光栅叶片的中间位置，直到完成所有的光栅叶片的中间位置的校验；
    光栅叶片精确定位，光栅叶片精确定位的方法包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S； 第三步，让该光栅叶片回归初始位置，此时标记为零；第四步，让该光栅叶片从初始位置开始向中间位置移动，同时记录时间t或转数s，此时该光栅叶片的实时位置即实际移动距离为l＝Lt/T或l＝Ls/S，当l等于预设的数值或需要的数值时即该光栅叶片到达目标位置，即可停止移动。
  8. 根据权利要求7所述的用于放射治疗设备的光栅装置的控制方法，其特征在于，所述控制方法还包括但不限于以下工况：
    前端位置校验，所谓前端位置，即，当两组光栅叶片中某一组光栅叶片中的某一片光栅叶片处于初始位置时，该光栅叶片的靠近中间位置一侧的端面即自由端端面所在的位置，就是另一组光栅叶片中的对应于该光栅叶片的光栅叶片的前端位置，即某一光栅叶片能够向前移动的极限位置，所述前端位置校验的方法是，在光栅叶片的前端即自由端设置前端位置传感器，先将某一组光栅叶片或待校验的光栅叶片对应位置的另一组的单一光栅叶片驱动回到初始位置，然后将第一个需要校验的光栅叶片向前端位置移动，直到触发前端位置传感器，做好前端位置标记，完成第一个光栅叶片的前端位置校验，然后按照相同的程序校验第二个光栅叶片的前端位置，直到完成所有的光栅叶片的前端位置的校验。
  9. 根据权利要求7所述的用于放射治疗设备的光栅装置的控制方法，其特征在于，所述控制方法还包括但不限于以下工况：
    光栅叶片移动速度校验或电机参数校验，包括以下步骤：第一步，完成初始位置校验和中间位置校验，并已知或实际测得初始位置到中间位置之间的距离L；第二步，驱动某一光栅叶片从初始位置移动到中间位置或从中间位置移动到初始位置，记录运行时间T或电机转数S；第三步，将测得的运行时间T或电机转数S与之前存储的运行时间T或电机转数S进行比较，如果相同则提示相同，如不同，则包括以下步骤中的至少一种步骤：其一提示不同；其二进行调教或维修后重新上述步骤；其三是将新测得运行时间T或电机转数S进行存储，取代原有参数纳入实时位置的技术公式l＝Lt/T或l＝Ls/S当中。
  10. 一种放射治疗设备，包括大机架和设于大机架上的加速器，其特征在于，还包括权利要求1到3所述的光栅装置。
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