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Accuracy: Frame-based versus IGRT-
frameless
•
Invasive SRS is NOT without uncertainties
•
Factors most influencing accuracy:
!
CT image slice thickness
!
Tension / distorsion of ring due to patient weight
!
MRI distorsion
!
CT, MRI, PET image registration
!
Target definition
!
Target localization
Maciunas
et al.
Neurosurgery 1994
Maciunas
et al.
Neurosurgery 1994
SBRT 2015 - D. Verellen
38