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Equivalent dose–volume histograms for the target, rectum, urinary bladder, and rectum without HGI. The rectal dose was reduced by HGI (a) with increasing effect for higher doses (b: semilogarithmic plot). Abbreviations: GyELQ2,α/β = 3, biologically equivalent dose calculated with the linear quadratic model at α/β = 3; D90 and D95, doses that cover 90% and 95% volumes of the clinical target volume, respectively. Physical dose in single fraction (Gy) is in the parentheses.
