Fig. 3From: Collimator rotation in volumetric modulated arc therapy for craniospinal irradiation and the dose distribution in the beam junction regionDose distributions by film measurement at the junction region of arc beams with two isocenters. The collimator angles were at 0°. The dose was normalized to 180cGy. From top to bottom: the Y coordinate of the lower isocenter was shifted −5, −3, −1, 0, 1, 3, 5 mm, respectivelyBack to article page