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Mean dose of IDC50%shell vs planning target volume (PTV) mean dose. Plots of IDC50%shell Mean Dose vs PTV Mean Dose (Dav) as percent of prescription Dose (% of Rx) for a tissue equivalent PTV (0.9 g/cc) of both spherical and cylindrical shapes for volumes: (a) 9 cc, (b) 33 cc, (c) 53 cc, and (d) 81 cc. Note the marked increase in IDC50%shell Mean Dose as the PTV Dav approaches the Rx dose.
