SBRT2015

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

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Maciunas et al. Neurosurgery 1994 SBRT 2015 - D. Verellen