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ITV Concept in ICRU-62 Report
PTV margin should be derived from
Internal Margin (IM) or Internal Target Volume (ITV)
Setup Margin
IM or ITV should compensate for physiological movements and variations in
size, shape, and position of the CTV in relation to an internal reference point
ITV often applied in lung SBRT where it encloses the full CTV in all respiratory
phases
PTV
ITV
CTV