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Dose distribution calculated using the Eclipse treatment planning system (Varian Medical Systems, Palo Alto, CA) for passive grid block technique. A, anterior; BEV, beam's eye view; F, feet; GTV, gross tumour volume; H, head; L, left; LPO, left posterior oblique; max, maximum; min, minimum; P, posterior; R, right; RT, radiation therapy; SAD, source axis distance.
