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(a) PTV volume, PTV visibility, and robotic placement interference status for individual patients with the PTV as the imaging target. NI: no interference; BI: beam interference with entering beam; MI: mechanical interference—physical collision threat or lack of a sufficient acoustic window. (b) As in (a) with the GTV as the imaging target. Note that for patient 7, GTV values are missing as the GTV was not outlined for treatment planning.
