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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