Fig. 4
From: Tangent-based volumetric modulated arc therapy for advanced left breast cancer
Two partial arcs (ArcC1 and ArcC2) in TVMAT were designed for CW and AXLN. ArcC1 rotated from 147 (range 130–155) to 295 (range 282–306) degrees. ArcC2 rotated from 156 (range 139–179) to 295 (range 282–306) degrees. Both had an avoidance sector from 90 to 0 degrees to reduce lung doses. a Beam’s eye view of ArcC1. b Angles with radiation in ArcC1 and ArcC2 (red dash lines)