SBRT2015

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• 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
Treatment decision
“to track or not to track?”
SBRT 2015 - D. Verellen 33