Blades of multi-blade collimator for electronic wire conformation and intensity modulated radiation therapy (IMRT)

Abstract

The invention discloses blades of a multi-blade collimator for electronic wire conformation and intensity modulated radiation therapy (IMRT), which are mainly characterized in that: the blade of the electronic multi-blade collimator is made of tungsten with thickness of 1.50 to 2cm so as to block most of electrons and generate relatively less bremsstrahlung; the end face of the blade is an upright end face, an inclined end face of which the inclined plane forms an angle of 3.75 to 60 degrees with a ray center shaft, and an arc-shaped end face with curvature radius of 0.75 to 0.85cm, and dosage penumbrae generated by the three end faces are basically the same; and the width of the blade is 0.8 to 1.2cm, so that radiated field edge dosage is relatively accurate and the accurate input of the subfield dosage is facilitated. Compared with the photon multi-blade collimator which is commonly used at present, the electronic multi-blade collimator has the advantages of simple structure, small occupied space, low cost, and more suitability for the electronic wire conformation and intensity modulated radiation therapy (IMRT) to better treat superficial tumors.

Description

technical field [0001] The invention relates to medical radiation therapy equipment, in particular to an electronic multi-leaf collimator blade used in electron beam conformal and intensity-modulated radiation therapy. Background technique [0002] The multi-leaf collimator is a mechanical moving part used to generate conformal and intensity-modulated radiation fields in radiation therapy. By driving each blade to a certain position, the radiation field required for treatment is formed. The multi-leaf collimator has gradually become a Standard configuration of medical accelerator therapy collimator. The thickness of the leaves of the multi-leaf collimator must be able to block most of the particles while producing as little as possible of other contaminating rays. The width of the leaf directly determines the conformity between the radiation field formed by the multi-leaf collimator and the shape of the tumor target area. The thinner the leaf, the better the conformity, but...

AI Technical Summary

Problems solved by technology

Because the bremsstrahlung radiation produced by high-energy electrons in thicker tungsten will cause radiation pollution, which has a great impact on the treatment results, and in actual electronic treatment, due to the limited space between the treatment head and the human body, too thick blades Not conducive to the implementation of treatment

Images