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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