Fig. 2From: Evaluation of OAR dose sparing and plan robustness of beam-specific PTV in lung cancer IMRT treatmentThe isocenter axial slice of the CTV (red line) expansion generated using 2D VHMR for 90° beam (green line) in a and 180° beam (yellow line) in b; c shows the isocenter axial slices of the union BSPTV for all beams (pink line); d shows the isocenter axial slices of the union BSPTV (pink line) and general PTV (light brown line).Back to article page