SBRT 2016

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

CTV

ITV

PTV