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Table 2 Coefficients for the 10th, 25th, 50th, 75th, and 90th percentile curves with the functional form of Eq. 1 for peripheral lesions, excluding RTOG 0915 major deviations. The standard error for each coefficient is included in parentheses

From: Lung Stereotactic Body Radiation Therapy (SBRT) dose gradient and PTV volume: a retrospective multi-center analysis

Percentile (%) A B
90 0.507 (0.059) 0.216 (0.022)
75 0.547 (0.026) 0.210 (0.009)
50 0.562 (0.017) 0.218 (0.006)
25 0.583 (0.021) 0.222 (0.007)
10 0.602 (0.020) 0.225 (0.007)