Collimation aperture variable collimation device and varying method thereof

Abstract

The invention discloses a collimating device with a variable collimating aperture, which comprises: a collimating body, on which there are at least two groups of final collimators, a driving device for driving the collimating device to move, and A control device; a pre-collimation body is arranged outside the collimation body, and a group of pre-collimation devices with the same distribution law as the radiation source are arranged on the pre-collimation body; the collimation body and the pre-collimation body can be axially connected as In one body, the collimator is rotatably arranged on a horizontally movable support, and the collimator and the pre-collimator are axially connected and separated through the support. The invention also discloses a method for changing the collimation aperture, which controls the separation of the collimation body and the pre-collimation body through the controller, and rotates the pre-collimation body to make the pre-collimation device and one group of final collimators on the collimation body Correspondingly, the two are butt-connected and integrated, which can improve the focusing accuracy of the rays of the radiation source, and conveniently realize variable collimation aperture.

Description

technical field [0001] The invention relates to a collimation device with variable collimation aperture and a conversion method thereof, which are used in radiation devices for rotary radiation therapy and belong to the field of physical therapy devices. Background technique [0002] The existing γ-ray radiation devices are medical and physical therapy devices. The early devices are generally fixed radiation devices. The radiation source is fixed in the source body and irradiated to the lesion of the patient after being collimated by a collimator. However, since static rays need to pass through the healthy tissue of the human body and enter the lesion, long-term use will damage the healthy tissue of the human body. [0003] In view of this, CN1087551A discloses a stereotactic rotatable focusing radiation device. The stereotactic radiation therapy device adopts the working principle of rotating focus, which can make the source body rotate and focus on the common intersection ...

AI Technical Summary

Problems solved by technology

[0007] The primary purpose of the present invention is to provide a collimation device with a variable collimation aperture and a conversion method thereof, which can improve the focusing accuracy of the rays of the radioactive source, and overcome the problems caused by the source body and the collimator during the rotation of the existing collimation device. The tracking error of the straight body makes the inner holes of the pre-collimator and collimator misaligned, resulting in the problem of decreased focusing accuracy; and the collimation aperture can be easily changed

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