Integrated primary collimator and accelerator therapy device

Abstract

The invention provides an integrated primary collimator and an accelerator therapy device. The integrated primary collimator comprises a primary collimator and at least two models of flattening blocksarranged on a carrier frame plate. The integrated primary collimator has the advantages of ensuring of switching of the different modes of the flattening blocks on the primary collimator, reduction the total height of the primary collimator and a flattening machine, increase of the therapy space, fastness in switching of the flattening blocks in place, and high switching efficiency.

Description

technical field [0001] The invention relates to the field of medical electron linear accelerators, in particular to an integrated primary collimator and accelerator treatment equipment. Background technique [0002] When using a medical electron linear accelerator for ray radiation therapy, the radiation head is located under the acceleration tube, which provides a radiation beam that meets certain uniformity and symmetry requirements, and limits the radiation beam to a certain area to meet clinical needs. For radiation fields of different sizes, the existing radiation head consists of multiple collimators. When a uniform ray beam is required, it is often necessary to set different types of homogenizers under the primary collimator to homogenize the ray beam. [0003] The existing primary collimator is either split or cylindrical; for the split primary collimator, the collimator made of tungsten steel is divided into upper and lower parts, the upper tungsten steel does not ...

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Problems solved by technology

[0003] The existing primary collimator is either split or cylindrical; for the split primary collimator, the collimator made of tungsten steel is divided into upper and lower parts, the upper tungsten steel does not move, and the lower tungsten steel needs to be Movement, due to the high density and weight of tungsten steel, the precise positioning is difficult and the service life is short for the movement mechanism with large load changes; for the cylindrical primary collimator, the levelers of different heights are aligned with the taper holes of the primary collimator , causing the total height of the primary collimator and leveler to be large, the greater the total height, the smaller the relative treatment space for the patient

[0004] The Chinese patent application number 201410028126.X discloses a split-type primary collimator. By dividing the primary collimator up and down into an upper half fixed part and a lower half movable part, the upper half fixed part of the primary collimator It is universal and equipped with different lower half movable parts. The upper half fixed part has a fixed part with a first through hole, and the lower half movable part is a movable part with a second through hole. The first through hole and the second through hole The through-holes are matched to form a beam-limiting hole for the ray beam to pass through after combination; and the second through-holes can be distributed on the turntable along the circumferential direction to meet the different requirements for the primary collimator and the uniform ray beam during treatment, but The lower half of the movable part still needs to drive the tungsten steel to move, which makes the movement space and load larger. When the lower half of the movable part and the upper half of the fixed part are aligned again, due to the weight and structural changes of the lower half of the movable part, it is easy to It leads to deformation, which leads to the deviation of the beam limiting through holes of the upper half of the fixed part and the lower half of the movable part and cannot be accurately aligned, which affects the accuracy of the beam output, and urgently needs to be improved

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