2017_SBRT_Course Book

Tracking: error analysis

• Tumor localization: Ø

Fiducial markers: stability, how many needed, migration, … Ø Direct visualization: real-time requires planar imaging, only limited number of cases practically possible • Correlation model between external markers (chest motion …) and internal tumor motion. • Prediction model forecasting tumor position to compensate for system latency: Ø Cyberknife: ± 115 ms (Hoogeman et al. ) Ø MLC: ± 140 ms (Poulsen et al. ) Ø Vero: ± 50 ms (Depuydt et al. )

SBRT 2017 - D. Verellen