Physics Bucharest 2017

From 2D to 3D Dose-Volume Analysis

 “There is a lack of correlation between conventional IMRT QA performance metrics (Gamma passing rates) and dose errors in anatomic regions-of-interest. The most common acceptance criteria and published actions levels therefore have insufficient, or at least unproven, predictive power for per-patient IMRT QA.”*  To 3D using 2D measurements  Mathematically perturb the dose in the patient  Reconstruct the dose in the phantom  Recalculate dose in the patient based on the reconstructed fluence

*Nelms BE, Zhen H, Tomé WA. Per-beam, planar IMRT QA passing rates do not predict clinically relevant patient dose errors. Med Phys. 2011 Feb;38(2):1037-44.