Fig. 1

Axial images of a representative patient comparing dose distribution from pencil-beam analytical algorithm plan (PBA; PBPB), PBA plan recalculated with Monte Carlo (PBMC), and PBA plan re-optimized with Monte Carlo (MCMC). Dose-volume histogram for ITV target coverage demonstrating how initial coverage in the PBPB plan (solid line) is lost in the PBMC plan (dotted line). Target coverage was recovered with MCMC plan (dashed line)