508 / 1578
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