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Table 4 The local gamma passing percentages at different quality assurance criteria for NPC IMRT cases

From: Clinical evaluation for the difference of absorbed doses calculated to medium and calculated to water by Monte Carlo method

Tolerance

Measurement vs Dm

Measurement vs Dw

t

p

3%&3 mm

94.3 ± 3.2%

97.1 ± 2.2%

−2.464

0.036

2%&2 mm

79.1 ± 2.7%

89.1 ± 1.6%

−2.882

0.018

1%&1 mm

43.6 ± 2.6%

56.1 ± 2.3%

−3.024

0.014

  1. t, p values were calculated by paired t-tests using the SPSS 19.0