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A Practical Example: SRT Case
▪
Intracranial lesion: 3 x 8 Gy @ 80%
N=3,
b
=0.84
▪
SD of the penumbra is 3.2 mm
s
pen
=3.2 mm
▪
E2E test device error (
S
) = 0.4 mm
S
1
=0.4 mm
▪
Localization (delineation) error = 1.0 mm (1 SD)
S
2
=1.0 mm
▪
Systematic error = 0.5 mm (1 SD)
S
eff
=0.58 mm
▪
Random error = 0.5 mm (1 SD)
s
eff
=0.41 mm
▪
Intra-fraction error = 0.5 mm ( 1 SD)
s
eff
=0.20 mm