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Target volumes
•
ICRU report 50 and supplement 62 (1993 + 1999) specified
definitions of different target volumes
•
ICRU 62 was an update triggered by:
i) increasing availability of conformal therapy
where margins are more critical
ii) need to describe normal tissues better
•
ICRU 62 introduced the Planning organ at Risk
Volume (PRV)
•
ICRU 83 (2010) developed concepts for IMRT