SBRT 2016

A Practical Example: SBRT Lung Case

 T1 primary lung lesion: 3 x 18 Gy @ 80% N = 3, β = 0.84  Alignment on time-averaged tumor position by CBCT  SD of the penumbra is 6.4 mm σ pen = 6.4 mm  E2E test device error ( Σ ) = 0.4 mm Σ 1 = 0.4 mm  Localization (delineation) error = 2.0 mm (1 SD) Σ 2 = 2.0 mm  Systematic error = 1.0 mm (1 SD) Σ eff = 1.0 mm  Random error = 1.0 mm (1 SD) σ eff = 1.0 mm  Intra-fraction amplitude = 1 – 25 mm σ r = 0.4 – 9.0 mm