SBRT2015

Treatment decision “to track or not to track?”

• Decision based on motion amplitude assessed from 4D-CT:

< 7 mm " ITV Approach

! ! ! ! ! !

PTV = ITV + 5 mm

PTV = ITV + 8mm (if lesion < 10 mm)

≥ 7 mm " Real-time tracking Internal marker if no contra-indication

PTV = GTV + 5 mm

33

SBRT 2015 - D. Verellen