阅读说明：本技术 一种多叶准直器叶片零位校准装置 (Blade zero calibration device of multi-blade collimator ) 是由 沙福泰 吴建兴 朱宜生 陈竟飞 陈璞 吴君军 柘江 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种多叶准直器叶片零位校准装置,装置包括安装在多叶准直器基座上的光电开关组件、光路准直组件、叶片组件及叶片驱动控制组件；光电开关组件用于形成一束检测光束并向驱动控制组件反馈校准信号；光路准直组件用于保证检测光束在检测范围内发散误差满足定位精度要求；叶片组件中的多个叶片分别在叶片驱动控制组件的驱动下运动至检测光束进行零位校准。本发明通过光路准直组件将一个光电开关的光路进行分段准直,消除光电开关的光路因长距离传输散射引起的不同位置触发误差,提高了多叶光栅各叶片的零位一致性,同时消除多光电开关触发精度与衰减速度不一致引起的零位误差。(The invention discloses a zero position calibrating device for a blade of a multi-blade collimator, which comprises a photoelectric switch component, a light path collimating component, a blade component and a blade driving control component, wherein the photoelectric switch component, the light path collimating component, the blade component and the blade driving control component are arranged on a base of the multi-blade collimator; the photoelectric switch assembly is used for forming a beam of detection light beam and feeding back a calibration signal to the drive control assembly; the light path collimation assembly is used for ensuring that the divergence error of the detection light beam in the detection range meets the requirement of positioning precision; and a plurality of blades in the blade assembly are respectively driven by the blade driving control assembly to move to the detection light beam for zero calibration. The invention carries out sectional collimation on the light path of a photoelectric switch through the light path collimation component, eliminates the triggering errors of different positions of the light path of the photoelectric switch caused by long-distance transmission scattering, improves the zero position consistency of each blade of the multi-leaf grating, and simultaneously eliminates the zero position error caused by the inconsistency of the triggering precision and the attenuation speed of the multi-photoelectric switch.)

1. A zero calibration device for the blades of a multi-blade collimator is characterized by comprising a multi-blade collimator base, a photoelectric switch assembly, a light path collimation assembly, a blade assembly and a blade drive control assembly;

the photoelectric switch assembly, the light path collimation assembly, the blade assembly and the blade driving control assembly are all arranged on the multi-blade collimator base;

the photoelectric switch assembly is used for forming a beam of detection light and feeding back a calibration signal to the drive control assembly;

the light path collimation assembly is used for ensuring that the divergence error of the detection light beam in the detection range meets the requirement of positioning precision;

and a plurality of blades in the blade assembly move to a detection light beam formed by the photoelectric switch assembly to perform zero calibration under the driving of the blade driving control assembly.

2. The multi-leaf collimator vane zero position calibration device of claim 1, wherein the photoelectric switch assembly includes a photoelectric transmitter, a photoelectric receiver and a photoelectric detection circuit; the photoelectric emitter and the photoelectric receiver are fixedly connected with the multi-blade collimator base and are respectively positioned on two sides of the blade assembly, and the optical axis of the photoelectric emitter is coaxial with the photoelectric sensor of the photoelectric receiver; the photoelectric detection circuit is fixedly connected with the multi-leaf collimator base and is respectively connected with the photoelectric emitter and the photoelectric receiver through cables and optical fibers; after the blade blocks the light path, the photoelectric detection circuit generates a switch signal and sends the switch signal to the blade driving control assembly, and at the moment, the encoder signal of the blade driving motor is the zero position metering value of the blade.

3. The blade zero position calibrating device for multi-leaf collimator of claim 2 wherein the light path collimating assembly includes a collimating guide rail and a plurality of collimating shades, the collimating guide rail is fixedly connected with the base of the multi-leaf collimator, the plurality of collimating shades are respectively fixedly connected with the collimating guide rail at a certain interval, and the collimating holes of the plurality of collimating shades are coaxial with the optical axis of the photoelectric emitter.

4. The multi-leaf collimator vane zero position calibration device of claim 3, wherein the vane assembly comprises a vane upper guide rail, a vane lower guide rail, a plurality of vanes and a limit shade; the lower blade guide rail is fixedly connected with the base of the multi-blade collimator, the upper blade guide rail is fixedly connected with the lower blade guide rail, each blade is fixedly connected with a limiting shading sheet, and the blades slide in the upper blade guide rail and the lower blade guide rail in a single direction.

5. The multi-leaf collimator vane zero position calibration device of claim 4, wherein the vane drive control assembly comprises a lead screw, a motor, a coupling, a motor base, an optical encoder and a motor drive control unit; the motor base is fixedly connected with the multi-leaf collimator base, the motor is fixedly connected with the motor base, the photoelectric encoder is fixedly connected with the motor, the motor is fixedly connected with the lead screw, the lead screw is in spiral transmission connection with the leaves, and the motor driving control unit is fixedly connected with the multi-leaf collimator base.

6. The blade zero position calibrating device for multi-blade collimator of claim 5 wherein the requirement of reducing the debugging time in controlling the precision is satisfied by controlling the number of collimation shades.

Technical Field

The invention relates to the technical field of radiotherapy equipment, in particular to a blade zero position calibration device of a multi-blade collimator.

Background

The multi-leaf collimator forms a polygon close to the projection shape of the tumor by multi-leaf movement according to the projection shape of the tumor under a certain radiation angle, thereby completing conformal radiotherapy. The consistency of the in-place precision and the repeated precision of the blades has great influence on the precision of radiotherapy, and after a plurality of photoelectric switches are adopted to respectively carry out zero calibration on the blades, the positions of the blades are respectively sampled through photoelectric encoders, so that the sampling consistency error of the positions of the photoelectric switches is increased, and meanwhile, the positioning error is also introduced due to the inconsistency of the precision and the attenuation speed of the photoelectric switches.

Disclosure of Invention

In view of the above, the present invention provides a zero calibration device for a leaf of a multi-leaf collimator, which performs sectional collimation on an optical path of a photoelectric switch through a plurality of collimating light sheets, eliminates triggering errors of different positions of the optical path of the photoelectric switch caused by long-distance transmission scattering, improves zero consistency of each leaf of a multi-leaf grating, and simultaneously eliminates zero errors caused by inconsistency of triggering accuracy and attenuation speed of the multi-leaf collimator.

A zero calibration device for the blades of a multi-blade collimator comprises a multi-blade collimator base, a photoelectric switch assembly, a light path collimation assembly, a blade assembly and a blade drive control assembly;

the photoelectric switch assembly, the light path collimation assembly, the blade assembly and the blade driving control assembly are all arranged on the multi-blade collimator base;

the photoelectric switch assembly is used for forming a beam of detection light and feeding back a calibration signal to the drive control assembly;

the light path collimation assembly is used for ensuring that the divergence error of the detection light beam in the detection range meets the requirement of positioning precision;

and a plurality of blades in the blade assembly move to a detection light beam formed by the photoelectric switch assembly to perform zero calibration under the driving of the blade driving control assembly.

Further, the optoelectronic switch assembly includes an optoelectronic transmitter, an optoelectronic receiver, and an optoelectronic detection circuit; the photoelectric emitter and the photoelectric receiver are fixedly connected with the multi-blade collimator base and are respectively positioned on two sides of the blade assembly, and the optical axis of the photoelectric emitter is coaxial with the photoelectric sensor of the photoelectric receiver; the photoelectric detection circuit is fixedly connected with the multi-leaf collimator base and is respectively connected with the photoelectric emitter and the photoelectric receiver through cables and optical fibers; after the blade blocks the light path, the photoelectric detection circuit generates a switch signal and sends the switch signal to the blade driving control assembly, and at the moment, the encoder signal of the blade driving motor is the zero position metering value of the blade.

Furthermore, the light path collimation assembly comprises a collimation guide rail and a plurality of collimation shading sheets, the collimation guide rail is fixedly connected with the multi-leaf collimator base, the plurality of collimation shading sheets are respectively and fixedly connected with the collimation guide rail according to a certain distance, and collimation holes of the plurality of collimation shading sheets are coaxial with the optical axis of the photoelectric emitter.

Further, the blade assembly comprises a blade upper guide rail, a blade lower guide rail, a plurality of blades and a limiting shading sheet; the lower blade guide rail is fixedly connected with the base of the multi-blade collimator, the upper blade guide rail is fixedly connected with the lower blade guide rail, each blade is fixedly connected with a limiting shading sheet, and the blades can slide in one direction in the upper blade guide rail and the lower blade guide rail.

Further, the blade driving control assembly comprises a screw rod, a motor, a coupler, a motor base, a photoelectric encoder and a motor driving control unit; the motor base is fixedly connected with the multi-leaf collimator base, the motor is fixedly connected with the motor base, the photoelectric encoder is fixedly connected with the motor, the motor is fixedly connected with the lead screw, the lead screw is in spiral transmission connection with the leaves, and the motor driving control unit is fixedly connected with the multi-leaf collimator base.

Furthermore, the requirement of reducing debugging time during control precision is met by controlling the number of the collimation shading sheets.

Has the advantages that:

1. the invention adopts a group of photoelectric switches to form a beam of detection light beam to detect the zero positions of a plurality of blades, eliminates device errors introduced by the multi-photoelectric switches, improves the zero position consistency of each blade of the multi-leaf grating, and simultaneously eliminates detection errors caused by inconsistent attenuation speeds of the multi-photoelectric switches.

2. The invention arranges a plurality of collimation shading sheets on the light path of the photoelectric switch, reduces the detection error caused by light path divergence during long-distance detection of the photoelectric switch, and improves the zero-bit consistency of each blade of the multi-blade grating.

Drawings

FIG. 1 is a schematic structural diagram of a blade zero calibration device of a multi-blade collimator according to the present invention.

The device comprises a base 1 of a multi-blade collimator, 2-connecting bolts, 3-lower blade guide rails, 4-upper blade guide rails, 5-blades, 6-limiting shading sheets, 7-photoelectric transmitters, 8-collimating guide rails, 9-collimating shading sheets, 10-photoelectric receivers, 11-photoelectric detection circuits, 12-lead screws, 13-couplers, 14-motors, 15-photoelectric encoders, 16-motor bases and 17-motor drive control units.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

As shown in the attached figure 1, the invention provides a blade zero position calibration device of a multi-blade collimator, which comprises a multi-blade collimator base 1, a photoelectric switch assembly, a light path collimation assembly, a blade assembly and a blade driving control assembly.

Wherein, the multi-blade collimator base 1 is a structural component connected with other components;

the photoelectric switch assembly comprises a photoelectric emitter 7, a photoelectric receiver 10 and a photoelectric detection circuit 11;

the light path collimation assembly comprises a collimation guide rail 8 and a plurality of collimation shading sheets 9;

the blade assembly comprises a blade upper guide rail 4, a blade lower guide rail 3, a plurality of blades 5 and a limiting shading sheet 6;

the blade driving control assembly comprises a screw rod 12, a motor 14, a coupler 13, a motor base 16, a photoelectric encoder 15 and a motor driving control unit 17;

the photoelectric emitter 7 and the photoelectric receiver 10 are fixedly connected with the multi-blade collimator base 1 and are respectively positioned at two sides of the blade 5 group, and the optical axis of the photoelectric emitter 7 is coaxial with the photoelectric sensor of the photoelectric receiver 10. The photoelectric detection circuit 11 is fixedly connected with the multi-blade collimator base 1, is respectively connected with the photoelectric emitter 7 and the photoelectric receiver 10 through cables and optical fibers, detects the receiving and transmitting signals, and sends the signals to the blade driving control assembly through cables.

The collimating guide rail 8 is fixedly connected with the multi-leaf collimator base 1, the collimating shade sheets 9 are respectively and fixedly connected with the collimating guide rail 8 according to a certain distance, and collimating holes of the collimating shade sheets 9 are coaxial with an optical axis of the photoelectric emitter 7;

the lower blade guide rail 3 is fixedly connected with the multi-blade collimator base 1, the upper blade guide rail 4 is fixedly connected with the lower blade guide rail 3, each blade 5 is fixedly connected with a limiting shading sheet 6, and the blades can slide in one direction in the upper blade guide rail 4 and the lower blade guide rail 3;

the motor base 16 is fixedly connected with the multi-leaf collimator base 1, the motor 14 is fixedly connected with the motor base 16, the photoelectric encoder 15 is fixedly connected with the motor 14, the motor 14 is fixedly connected with the lead screw 12, the lead screw 12 is in spiral transmission connection with the leaf 5, and the motor drive control unit 17 is fixedly connected with the multi-leaf collimator base 1.

The working principle is as follows: when the blade is subjected to zero calibration, the photoelectric emitter 7 and the photoelectric receiver 10 are firstly opened, a detection light beam is formed between the photoelectric emitter 7 and the photoelectric receiver 10, the detection light beam emitted by the photoelectric emitter 7 is received by the photoelectric receiver 10 after passing through the collimation holes of the plurality of collimation shading sheets 9, and the collimation holes ensure that the light beam is not scattered. The motor 14 drives the screw rod 12 to rotate under the control of the motor drive control unit 17, and finally drives the blade 5 to unidirectionally slide towards the detection light beams in the blade upper guide rail 4 and the blade lower guide rail 3, when the blade 5 moves to the position of the detection light beams and shields the detection light beams, the photoelectric receiver 10 cannot detect the emission signals of the photoelectric emitter 7, the photoelectric encoder detects the change of pulses, the displacement of the blade is accurately measured and controlled, and zero calibration of a plurality of blades 5 is realized.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.