Collimator angle optimization method for volumetric-modulated arc therapy plan

Abstract

The invention discloses a collimator angle optimization method for a volumetric-modulated arc therapy plan. Patient-specific target region structure information is used to perform three-dimensional reconstruction on a target region in order to obtain the projection images of the target region at different frame angles, and segmented optimization of the complete arc according to the conformal indexes of the different collimator angles to the target region and pertinent optimization of the collimator angle of each arc segment are carried out to achieve the personalized dynamic collimator angleoptimization method for the volumetric-modulated arc therapy plan. The method can dynamically optimize the collimator angle according to the patient-specific target region information, so the manual participation degree and the degree of dependence of the plan quality on the artificial experience are reduced, the increase of the efficiency and the consistency of the plan design is facilitated, a specific optimal plan is designed for every patient, and the resulting dosimetric improvement can avoid unnecessary tumor control rate decline and normal tissue damages and improve the efficacy of clinical radiotherapy.

Description

technical field [0001] The invention relates to a method for optimizing a radiotherapy plan, in particular to a method for optimizing the angle of a collimator in a volume-rotating intensity-modulated radiotherapy plan. Background technique [0002] Radiation therapy is one of the three major means of cancer treatment. Compared with fixed-field intensity-modulated radiation therapy, volume-rotating intensity-modulated radiation therapy has better dosimetry characteristics and higher execution efficiency, so it is widely used. During the optimization process of the current volume rotation intensity-modulated radiotherapy plan, the physicist needs to manually set the collimator angle or adopt the system default collimator angle, and the collimator angle is fixed throughout the entire arc. On the one hand, the collimator angle set artificially based on experience does not take into account the specificity of the geometric shape and geometric position of the patient's target are...

AI Technical Summary

Problems solved by technology

However, the current volume-rotating intensity-modulated radiotherapy technology at home and abroad, the collimator angles used are all empirical values ​​and recommended values ​​by the manufacturer, and have not been individually optimized according to the individual differences of patients, nor have they been optimized according to the machine in the entire arc. Adjust for changes in rack angle

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