PO-1971 Patient experience and gating efficiency using a visual tracking system for breath hold during MRgRT. (August 2021) - Weitkamp, N.; Ehrbar, S.; Chamberlain, M.; Perryck, S.; Rudolf, T.; Wilke, L.; Garcia Schüler, H.I.; Tanadini-Lang, S.; Guckenberger, M.; Andratschke, N.