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Accuracy: Frame-based versus IGRT-
frameless
•
Invasive SRS is NOT without uncertainties
•
Factors most influencing accuracy:
Ø
CT image slice thickness
Ø
Tension / distorsion of ring due to patient weight
Ø
MRI distorsion
Ø
CT, MRI, PET image registration
Ø
Target definition
Ø
Target localization
Maciunas
et al.
Neurosurgery 1994
Maciunas
et al.
Neurosurgery 1994
SBRT 2017 - D. Verellen
49