A high-precision radiotherapy collimator

Abstract

The invention discloses a high-precision radiotherapy collimator, which comprises a conformal phantom arranged under an X light source, the conformal phantom is an integrally formed hollow body, the hollow body is filled with heavy metal powder, and the conformal phantom There are multiple hollow parts on the top. The invention can realize accurate individualized treatment. In the current technology, the blade thickness of the MLC is limited, and the highest resolution of the projected isocenter can only reach 1.5mm. The invention can greatly improve the resolution of the conformal area. There is no need for motion control of each blade, no need for blade drive motors, and no time for collimator adjustment during radiotherapy. After adopting 3D printing integrated conformal mold, the problem of leakage rays will be completely solved. The projected light path is planned before the operation, and the shape is created to create a conformal hollow mechanism, which saves treatment time. Due to this conformal model, the penumbra is reduced near the patient end of the optical path. The weight of the machine head is reduced, which simplifies the complexity of the electromechanical control of the whole machine. Protect the patient's healthy tissue and improve efficacy.

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

Images