Orthogonal double-layer grating device for radiotherapy equipment and its sub-field segmentation control method

Abstract

The invention provides an orthogonal double-layer optical grating device for radiotherapy equipment and a subregion division control method thereof. The orthogonal double-layer optical grating deviceis installed below an accelerator head of the radiotherapy equipment, and comprises an upper layer optical grating blade and a lower optical grating blade, wherein planes where the upper layer opticalgrating blade and the lower optical grating blade are located are parallel, and are perpendicular to the direction of ray sent out by the accelerator head, and the motion directions of the upper layer optical grating blade and the lower optical grating blade are orthogonal; the subregion division control method is based on the double-layer optical grating device. The orthogonal double-layer optical grating device for the radiotherapy equipment and the subregion division control method thereof provided by the invention can improve a conformation number and therapy efficiency obviously, and have great clinical significance.

Description

technical field [0001] The invention relates to the field of radiotherapy equipment, in particular to an orthogonal double-layer grating device used in radiotherapy equipment and a subfield segmentation control method thereof. Background technique [0002] As a local treatment method for tumors, radiotherapy has been constantly seeking to solve a basic problem: how to better deal with the dose relationship between tumor tissue (target area) and surrounding normal tissues, so that the tumor can be controlled locally to the maximum extent. Radiation damage to surrounding normal tissues and organs is minimal. [0003] The grating is an essential multi-leaf collimator for modern radiotherapy equipment. Through the movement of the grating blades, it can have a very good conformal effect on the target area. Generally, the thinner the blades of the multi-leaf collimator, the The larger the number, the better the conformability of the multi-leaf collimator. However, for conventiona...

AI Technical Summary

Problems solved by technology

[0024] 1. The conformity in the thickness direction of the blade is not enough;

[0025] 2. In order to meet the multi-segment intensity distribution map and the non-overlapping constraints of the leaves, the irradiation efficiency of a single-layer grating is limited. A complex radiation field requires multiple sub-fields to form, and the irradiation efficiency is low.

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