Fig. 2
From: Tangent-based volumetric modulated arc therapy for advanced left breast cancer
Two partial arcs (ArcN1 and ArcN2) in TVMAT were designed for SCF and ICF. Both were half-beam fields (orange rectangle in (a)). ArcN1 rotated from 179 to 335 degrees with an avoidance sector from 120 to 60 degrees. ArcN2 rotated from 35 to 181 degrees with an avoidance sector from 300 to 240 degrees. a Beam’s eye view of ArcN1. b Angles with radiation in ArcN1 and ArcN2 (red dash lines)