CN219071877U

CN219071877U - Position calibration device of radiotherapy equipment

Info

Publication number: CN219071877U
Application number: CN202223274235.9U
Authority: CN
Inventors: 张福; 曹学国
Original assignee: Jiangsu Ruier Medical Science & Technology Co ltd
Current assignee: Jiangsu Ruier Medical Science & Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-26
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a position calibration device of radiation therapy equipment, which comprises a rotary disk, a plurality of collimators, a driving mechanism, a scale with graduations, a reading head and a control module, wherein the rotary disk is arranged on the rotary disk; a plurality of collimators are arranged on the rotary disk, and the drive mechanism drives the rotary disk to rotate; the graduated scale is an annular ring, the outer part is carved with graduations in a coding form, and when the driving mechanism drives the rotating disk to do rotary motion along the axis of the rotating disk, the rotating disk drives the graduated scale to do synchronous motion along with the rotor of the driving mechanism; the scale reading head is fixed on radiotherapy equipment and is arranged on the outer side of a scale with scales, the reading head emits laser, scales of the scale with scales are irradiated to encode and reflect the laser to photosensitive components inside the reading head, the photosensitive components convert the laser with the encoded scales into position information and send the position information to the control module, and errors caused by micro deformation of a transmission component are reduced.

Description

Position calibration device of radiotherapy equipment

Technical Field

The utility model belongs to the technical field of radiosurgery robot equipment, and particularly relates to a position calibration device of radiotherapy equipment.

Background

The radiosurgery robot system is special equipment for radiosurgery treatment, is mainly used for accurate radiotherapy of whole body solid tumors, combines advanced technologies such as multi-mode image guidance, modern robots, miniaturized linear accelerators and the like, realizes accurate radiotherapy under the accurate image guidance, and treats tumors of different sizes in large-dose and low-fraction (1 to 5 times).

A radiosurgery robot system adopts a plurality of non-coplanar high-dose small-field irradiation beams in a spherical treatment space, so that accelerator treatment beams can be projected to a target area of a patient in different directions at different positions on the spherical surface so as to reach optimal treatment dose distribution and obtain the best treatment effect. Wherein each treatment requires the use of multiple different aperture fields to achieve a treatment planning dose distribution. The multiple different aperture portal illumination for each fraction treatment is achieved by changing the different aperture secondary collimator in the linac. The accurate and rapid movement of the secondary collimators with different apertures to the beam position is a key step in the treatment process of the collimation system. However, during the movement process of treatment, due to the limitation of the material technology, part of the components can deform, such as the torsional rigidity of devices like a coupler is small, the elastic deformation quantity is large, the position of the collimator is deviated, and the treatment effect can be influenced.

Disclosure of Invention

In order to solve the technical problems, the utility model discloses a position calibration device of radiotherapy equipment, which realizes the accurate position adjustment control of the quick switching of a collimator by feeding back the position deviation in real time and correcting the position deviation.

The complete technical scheme of the utility model comprises the following steps:

a position calibration device of radiotherapy equipment comprises a rotary disk, a plurality of collimators, a driving mechanism, a scale with graduations, a coding translation module and a control module;

the rotary disc is provided with a plurality of collimators, and the driving mechanism drives the rotary disc to rotate;

the scale with the scales is an annular ring, scales in a coding form are carved on the outer part of the rotary disk, and when the rotary disk is driven by the driving mechanism to do rotary motion along the axis of the rotary disk, the scale with the scales is driven by the rotary disk to do synchronous motion along with the rotor of the driving mechanism;

the scale coding translation module is fixed on the radiotherapy equipment and arranged on the outer side of a scale with scales, the coding translation module emits laser, the scales of the scale with scales are irradiated to be coded and reflected to photosensitive components in the coding translation module, and the photosensitive components convert the laser with the coded scales into position information and send the position information to the control module.

Further, in the process that the driving mechanism drives the rotating disc to rotate, different collimators are driven to be under the beam holes.

Further, the scale with scales is fixed on the upper side of the rotating disc through screws.

Further, the scale with scales is a steel annular ring.

Further, the distance between the scale coding translation module and the scale outer ring with scales is 0.55mm.

Further, the roundness of rotation of the graduated scale is less than 0.08 when the graduated scale is installed.

Further, the position calibration device further comprises an anti-falling mechanism, the anti-falling mechanism is arranged below the collimator and comprises a plurality of anti-falling fixing blocks which are rotationally symmetrical with the central axis of the position calibration device, the number of the anti-falling fixing blocks is the same as that of the collimator, gaps are reserved among the anti-falling fixing blocks, and the anti-falling mechanism can rotate around the central axis of the position calibration device, so that the anti-falling fixing blocks or gaps between the anti-falling fixing blocks are arranged below the collimator.

Further, the anti-falling mechanism is further provided with a position sensor, and the position sensor can sense whether the anti-falling fixed block is positioned under the collimator or not and output corresponding signals.

The utility model has the advantages compared with the prior art that: the graduated scale and the coding translation module can directly measure the rotation position value of the rotating disk, realize accurate control and reduce errors caused by miniature deformation of transmission components such as a drive mechanism coupler and the like due to loading of the collimator.

Drawings

FIG. 1 is a schematic diagram of a position calibration device according to the present utility model.

Fig. 2 is a bottom view of the position calibration device of the present utility model.

In the figure: 1-rotary disk, 2-collimator, 3-actuating mechanism, 4-scale, 5-coding translation module, 6-anti-drop mechanism.

Detailed Description

The present utility model will be described in detail with reference to the following examples and drawings, but it should be understood that the examples and drawings are only for illustrative purposes and are not intended to limit the scope of the present utility model in any way. All reasonable variations and combinations that are included within the scope of the inventive concept fall within the scope of the present utility model.

As shown in fig. 1, a position calibration device of a radiotherapy apparatus includes a rotary disk 1, a plurality of collimators 2, a driving mechanism 3, a scale 4 with graduations, a code translation module 5, an anti-falling mechanism 6, and a control module.

The driving mechanism 3 is located above the position calibration device and is connected with the rotating disc 1, the driving mechanism 3 can adopt a stepping motor or any other component capable of driving the rotating disc 1 to rotate, the rotating disc 1 is provided with a plurality of collimators 2, and the driving mechanism 3 drives the rotating disc 1 to rotate so as to drive the secondary collimators with different apertures to the beam position.

The graduated scale 4 surrounds the upper side of the rotary disk 1 and is fixed by a screw, and the inner diameter size of the graduated scale can be larger than the outer diameter size of the rotary disk. When the driving mechanism drives the rotating disk to do rotary motion along the axis of the rotating disk, the rotating disk drives the scale with scales to do synchronous motion along with the rotor of the driving mechanism. The scale with the graduation is a steel annular ring, and the outer part is carved with the graduation in a coding form.

The scale code translation module is fixed on the radiotherapy equipment, is arranged outside the scale with scales, is 0.55mm away from the outer ring of the scale with scales, can be a grating scale reading head, emits laser, illuminates scale codes of the scale with scales after being reflected by the prism, reflects the laser with the scale codes to photosensitive components in the code translation module, and converts the laser with the code scales into position information in Endat2.2 format for communication to the control module.

The speed of the code translation module for reading the position of the scale with the graduation is 25 microseconds, so that real-time position monitoring feedback can be realized. In order to ensure that the code translation module can correctly read the scale code on the graduated scale, the rotation roundness of the graduated scale during installation is less than 0.08, and the distance between the code translation module and the graduated scale is 0.55+/-0.15 mm.

When the position calibration device is used, firstly, position calibration is carried out, the position value of the graduated scale is used as the theoretical value of the preset position, the driving mechanism is recorded as the initial theoretical value of the driving mechanism when the position value of the graduated scale accords with the theoretical value, and the position calibration is completed. Then the driving mechanism drives the rotary disk to rotate, collimators with different apertures are respectively brought under the beam holes to carry out radiation treatment, at the moment, the scale coding translation module reads the scale positions with scales in real time, and the scale position reading with scales and the theoretical position threshold range are judged; when the position of the scale with scales deviates from the theoretical position by a certain range, the control module sends a correction command to the driving mechanism, and the current position is moved to an ideal position range to correct the angle deviation, so that the position control is realized.

The anti-falling mechanism 6 is arranged below the collimator 2 and comprises a plurality of anti-falling fixing blocks which are rotationally symmetrical relative to the central axis of the position calibration device, the number of the anti-falling fixing blocks is the same as that of the collimators, gaps are reserved among the anti-falling fixing blocks, the anti-falling mechanism 6 can rotate around the central axis of the position calibration device, the anti-falling fixing blocks or the gaps between the anti-falling fixing blocks are arranged below the collimators, the anti-falling mechanism 6 is also provided with a position sensor, and the anti-falling mechanism can sense whether the anti-falling fixing blocks are positioned under the collimators or not and output corresponding signals. During normal operation, each anti-drop fixed block of the anti-drop mechanism rotates to the position right below the collimator, and the collimator is prevented from dropping to the ground when the locking of the collimator fails. When the collimators are replaced, the anti-falling fixed blocks are rotated between adjacent collimators, the collimators can be detached and replaced from a gap between the anti-falling fixed blocks, and the position sensor judges the positions of the anti-falling fixed blocks and outputs corresponding signals.

The above applications are only some of the embodiments of the present application. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the inventive concept.

Claims

1. The position calibration device of the radiotherapy equipment is characterized by comprising a rotary disk, a plurality of collimators, a driving mechanism, a scale with graduations, a coding translation module and a control module;

2. The position calibration device of claim 1, wherein the drive mechanism drives the different collimators under the beam holes during rotation of the rotating disc.

3. A position calibration device for a radiation therapy apparatus according to claim 2, wherein the graduated scale is fixed to the upper side of the rotating disc by means of screws.

4. A position calibration device for a radiation therapy apparatus according to claim 3, wherein the graduated scale is a steel annular ring.

5. A position calibration device for a radiation therapy apparatus according to claim 1, wherein the scale code translation module is spaced from the graduated scale outer ring by 0.55mm.

6. A position calibration device for a radiation therapy apparatus according to claim 5, wherein the roundness of rotation of the graduated scale when mounted is less than 0.08.

7. The position calibration device of claim 1, further comprising an anti-drop mechanism disposed below the collimator, the anti-drop mechanism comprising a plurality of anti-drop fixing blocks rotationally symmetrically disposed about a central axis of the position calibration device, the number of the anti-drop fixing blocks being the same as the number of the collimators, and the plurality of anti-drop fixing blocks leaving a gap, the anti-drop mechanism being capable of rotating about the central axis of the position calibration device such that the anti-drop fixing blocks or the gaps therebetween appear below the collimator.

8. The position calibration device of claim 7, wherein the anti-drop mechanism is further provided with a position sensor capable of sensing whether the anti-drop fixed block is located directly below the collimator and outputting a corresponding signal.