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ITV Concept in ICRU-62 Report
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PTV margin should be derived from
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Internal Margin (IM) or Internal Target Volume (ITV)
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Setup Margin
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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
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ITV often applied in lung SBRT where it encloses the full CTV in all respiratory
phases
PTV
ITV
CTV