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A Practical Example: SBRT Lung Case
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T1 primary lung lesion: 3 x 18 Gy @ 80%
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Alignment on time-averaged tumor position by CBCT
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Tumor in lung tissue
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E2E test device error (1 SD) = 0.4 mm (measured over a long period)
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Localization (delineation) error = 2.0 mm (1 SD)
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Systematic error = 1.0 mm (1 SD) [measured from 3-fraction treatments]
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Random error = 1.0 mm (1 SD) [measured from 3-fraction treatments]
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Intra-fraction amplitude = 1 – 25 mm