Systems and Methods for Composite Dose Quality Assurance with Three-Dimensional Arrays

Abstract

A method for performing composite dose quality assurance with a three-dimensional (3D) radiation detector array includes delivering a radiation fraction to the 3D array according to a radiation treatment (RT) plan, measuring absolute dose per detector of the 3D array, per unit of time, determining a radiation source emission angle per unit of time, synchronizing the RT plan with the measured absolute doses and determined radiation source emission angles to determine an absolute time for a control point of each beam of the synchronized RT plan, converting the beams of the synchronized RT plan into a series of sub-beams, generating a 3D relative dose grid for each of the sub-beams, applying a calibration factor grid to each of the 3D relative dose grids to determine a 3D absolute dose grid for each of the sub-beams, summing the 3D absolute dose grids to generate a 3D absolute dose deposited in the 3D array, and determining a 3D dose correction grid for application to the RT plan based on the 3D absolute dose.

What is claimed is: 
     
         1 . A method for performing composite dose quality assurance with a three-dimensional (3D) radiation detector array, the method comprising:
 delivering, from a moving radiation source, a radiation fraction to the 3D array according to a radiation treatment (RT) plan;   measuring absolute dose per detector of the 3D array, per unit of time;   determining a radiation source emission angle per unit of time;   synchronizing the RT plan with the measured absolute doses and determined radiation source emission angles to determine an absolute time for a control point of each beam of the synchronized RT plan;   converting the beams of the synchronized RT plan into a series of sub-beams;   generating a 3D relative dose grid for each of the sub-beams;   applying a calibration factor grid to each of the 3D relative dose grids to determine a 3D absolute dose grid for each of the sub-beams;   summing the 3D absolute dose grids to generate a 3D absolute dose deposited in the 3D array; and   determining a 3D dose correction grid for application to the RT plan based on the 3D absolute dose.