High-precision electron beam radiation field stop block

Abstract

The invention discloses a high-precision electron beam radiation field stop block, and mainly relates to the field of radiotherapy equipment. The high-precision electron beam radiation field stop block comprises a plurality of barrier plates, two retaining plates and a clamping device, ray passing holes are formed in the barrier plates and the retaining plates, the multiple barrier plates are arranged in an up-and-down mutual stacking mode, and the barrier plates are machined by lead plates of 0.5-3 mm; and the retaining plates are stacked on the upper side and the lower side of the stacked barrier plates, the retaining plates are machined by cold-roll steel plates of 1-3 mm, the two retaining plates are pressed towards the barrier plates through the clamping device, and the barrier plates and the retaining plates are fixed. The high-precision electron beam radiation field stop block has the beneficial effects that the manufacturing of the radiation field stop blocks in different shapes can be rapidly completed, and meanwhile, the higher machining precision is guaranteed.

Description

technical field [0001] The invention relates to the field of radiotherapy equipment, in particular to a high-precision electron beam field stopper. Background technique [0002] The main purpose of the block is to change the regular field into an irregular field, so that the shape of the field is consistent with the projection of the shape of the target area; in order to protect important tissues and organs in the field, lead with low melting point is generally used. The thickness of the lead block generally requires 5 half-valence layers of a specific ray energy, that is, the original ray is weakened by 95%. Cobalt 60 y-rays and accelerator 6MV X-rays generally use 8cm thick low-melting lead. [0003] When the low melting point money is used as a part of the collimator to form an irregular field, the thickness of the collimator should not exceed 5% of the transmission amount of the primary ray. Traditional processing is to use foam to process the male mold and then pour i...

AI Technical Summary

Problems solved by technology

The traditional method takes a long time to form, and porosity, slag inclusions, shrinkage porosity, and cracks are prone to occur during casting, and the post-processing is cumbersome. The entire production process requires high technical level of personnel

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