Systems, devices, and methods for quality assurance of radiation therapy

摘要

Systems, devices, and methods for quality assurance for verification of radiation dose delivery in arc-based radiation therapy devices using a 3D gamma evaluation method.

主权项

1. A method for verifying quantities of interest of a radiation beam in an arc-based radiation therapy device including a gantry, comprising:
acquiring and converting 2D images in order to generate radiation dose distribution images at predetermined radiation fields, each radiation field corresponding to a predetermined arc segment of the gantry; comparing the generated radiation dose distribution images with corresponding predicted radiation dose distribution images using a three-dimensional (3D) gamma evaluation method, the comparing including: calculating dose differences, spatial differences, and angular differences between points in the generated images and corresponding points in the predicted images; and evaluating the calculated differences using a gamma error function, the gamma error function determining minimums of a metric comprising the calculated dose, spatial, and angular differences for the points evaluated in the generated image; and determining acceptability of a quantity of interest based on a result of the evaluation.