Optimal method for incident path of non-coplanar radiotherapy beams

Abstract

The present invention relates to a non-coplanar radiotherapy beam incident path optimization method, which comprises the following steps: first, obtaining a medical image of a patient; second, obtaining structural information of the patient according to the medical image of the patient; third, obtaining 3D distribution model of the target area and organs at risk based on the structural information of the target area; fourthly, the cost map of each incident angle cost is produced by ray tracing; fifthly, the path with the minimum total cost is found in the cost map by using the shortest path algorithm as the surface optimization track. This method is an automatic path selection method based on the cost map. It does not require manual selection. It can evaluate various possible incident angles in three-dimensional space, and can obtain the optimal non-coplanar incident path for different patients and different treatment parts. , the non-coplanar radiotherapy beam path finally obtained by this method is continuous, and there is no need to enter the treatment room to move the treatment bed during the treatment process, which can save treatment time.

Description

technical field [0001] The invention relates to the field of medical and health technologies, in particular to a method for optimizing the incident path of non-coplanar radiotherapy beams. Background technique [0002] Conventional radiation therapy techniques are divided into coplanar irradiation and non-coplanar irradiation. The central axes of all irradiation fields in coplanar irradiation are in the same plane, and the central axes of irradiation fields in non-coplanar irradiation are not in the same plane. Studies have shown that compared with coplanar irradiation, non-coplanar irradiation technology has shown superiority in dosimetry in the radiotherapy of various tumors. Conventional accelerators achieve non-coplanar irradiation by introducing the rotation of the treatment bed. When selecting the incident path, it is necessary to select the optimal incident angle in three-dimensional space and take into account the collision between the treatment head and the treatmen...

AI Technical Summary

Problems solved by technology

However, at present, the incident path of non-coplanar illumination lacks a good selection method, usually relying on experience to artificially select 3-5 fixed incident angles

This method cannot find the optimal incident path in the three-dimensional space very well, and the incident nodes are not continuous, so it is necessary to move the treatment head and the treatment bed to the next irradiation node after irradiating one node, resulting in relatively long treatment time

[0003] The non-coplanar radiotherapy solution in the prior art is aimed at the non-coplanar treatment of intracranial lesions, and it is not universally applicable to the treatment of other parts; moreover, the non-coplanar incident path in the prior art is preset, Cannot provide personalized customization for each patient

Images