Advanced Skills in Modern Radiotherapy 2018

Irradiated Volume and Treated Volume: IRV and TV

• IRV : Defined as the volume receiving a significant dose on surrounding normal tissues / Organs At Risk

• Different from the treated volume which is meant to be treated

• Both depend on the technique used

• Both can be evaluated on the dosimetry but IRV evaluation is rather limited by most TPS ➢ Ex: dose estimation outside of the treated field when using non coplanar beams