Fig. 1.

Example of differences between predicted and adapted plans. In this patient, planning target volume (PTV) coverage by the predicted fraction (baseline plan on the daily anatomy, left magnetic resonance [MR] image) was insufficient (PTV V95% = 71.70%). The isodose 95% (green line) did not correctly encompass the PTV (red volume). After adaptation (adapted plan on the daily anatomy, right MR image), PTV coverage was improved (PTV V95% = 96.13%) and the isodose 95% (green line) encompassed the PTV, as planned (red volume).