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Dose distributions for 3-mm urethral margin of (a) 192Ir based HDR-BT and (b) 153Gd based multisource RSBT apparatus sampled onto a CT scan of a prostate cancer patient. (c) Dose-volume histograms for conventional 192Ir HDR-BT and 153Gd based multisource RSBT apparatus for urethral margin of 3 mm.
