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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