SBRT 2016

A Practical Example: SRT Case

 Intracranial lesion: 3 x 8 Gy @ 80% N=3, β =0.84  SD of the penumbra is 3.2 mm σ pen =3.2 mm  E2E test device error ( Σ ) = 0.4 mm Σ 1 =0.4 mm  Localization (delineation) error = 1.0 mm (1 SD) Σ 2

=1.0 mm

=0.58 mm

 Systematic error = 0.5 mm (1 SD) Σ eff  Random error = 0.5 mm (1 SD) σ eff  Intra-fraction error = 0.5 mm ( 1 SD) σ eff

=0.41 mm

=0.20 mm