SBRT 2016

Number of Fractions and Residual Systematic Error

 Limited number of fractions results in a residual shift of the dose distribution

0 2 4 6 8 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Error (mm)

-8 -6 -4 -2

FractionNumber

 Residual error

 Error after 35 fractions = 0.1 mm  Error after 5 fractions = -1.6 mm