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a Cumulative dose-volume histograms for equatorial tumors of different sizes, all irradiated centrically with equatorial plaque placement. Each histogram label indicates the plaque used and the height of the treated tumor. ‘CCB plaque, 7.5 mm’ is not shown, since it is similar to the 7-mm case. b Cumulative dose-volume histograms for structures and organs at risk if a 7-mm equatorial tumor is irradiated centrically with a CCB plaque.
