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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