Fig. 1
From: Gantry-based pencil beam scanning proton therapy for uveal melanoma: IMPT versus proton arc therapy
(A) Patient-specific thermoplastic head mask attached with a customized gazing device. (B) CBCT and (C) kV images acquired for IGRT purpose, as well as the aligned contours of target, tantalum markers, gazing device and gazing point on them