High-precision radiotherapy collimator

Abstract

The invention discloses a high-precision radiotherapy collimator, and the collimator comprises a conformal die body disposed below an X light source. The conformal die body is an integrated hollow body, and the interior of the hollow body is provided with heavy metal powder. The conformal die body is provided with a plurality of hollow-out parts. The collimator can achieve the precise personalized treatment. In the prior art, the highest resolution of a projection center just can reach 1.5mm because of the blade thickness limit of an MLC. The collimator can greatly improve the resolution of a conformal region. The collimator does not need to control the motion of each blade, does not need a blade drive motor, and does not need to adjust the time during radiotherapy. The collimator employs 3D printing for the integrated conformal die, thereby completing solving a problem of ray leakage. A projection path is planned before the operation, and a conformal hollow-out mechanism is molded and manufactured, thereby saving the treatment time. A half image of an end, the optical path of which is close to a patient, of the conformal die is reduced, and the weight of a machine head is reduced, thereby reducing the overall electromechanical control complexity, protecting the healthy tissues of the patient, and improving the curative effect.

Description

technical field [0001] The invention relates to a collimator, in particular to a high-precision radiotherapy collimator. Background technique [0002] The Multileaf Collimator (MLC) is the main device for field conformation on a medical linear accelerator. It uses multiple micro-motors controlled by a computer to independently drive each blade to move independently to achieve conformity to the target area and dose conformity. [0003] The distance between the MLC and the accelerator is far from the isocenter, and in order for the blade to have a width of 1 cm at the isocenter, a blade with a narrower actual width is required. [0004] The defects of existing MLC are as follows: [0005] 1. Resolution. One of the shortcomings of MLC in clinical application is that when it is used to conform to the target area, the formed radiation field has a stepped boundary, which cannot be completely consistent with the expected target area with a smooth boundary. That is to say, with c...

AI Technical Summary

Problems solved by technology

[0006] 2. Leakage rays, there are leakage rays between the collimator blades

[0007] 3. Penumbra, the collimator is close to the ray source, and the ray source is not an ideal point light source, so penumbra will inevitably occur

[0008] 4. The weight of the collimator increases the conformity of the rotating arm, which makes it difficult for the machining and motion control of the treatment head

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