Critical discussion of different dose-volume parameters for rectum and urethra in prostate brachytherapy

Only absolute volume parameters are stable in relation to different contouring concepts. When delineating the outer rectum contour, only RD2cc and RD0.1cc can be used. RV100 in cc correlates to RD2cc. Reporting UD5, UD10, and UD30 together is redundant. Additional information is given when reporting UV100 or UV150.