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Table 3 Correlations between global gamma passing rates with various gamma criteria and the modulation indices for intensity modulated radiation therapy plans of TrueBeam STx (p ≤ 0.05)

From: Assessment of the modulation degrees of intensity-modulated radiation therapy plans

  3%/3 mm 2%/2 mm 2%/1 mm 1%/2 mm
r s p r s p r s p r s p
MapCHECK2
 MIs − 0.241 0.016 − 0.200 0.046
 MIa
 MIc, IMRT − 0.201 0.045
 MCS 0.453 < 0.001 0.548 < 0.001 0.509 < 0.001 0.460 < 0.001
 PA −0.223 0.026 − 0.236 0.018 − 0.196 0.050
 PI −0.465 < 0.001 −0.591 < 0.001 − 0.550 < 0.001 − 0.474 < 0.001
 PM − 0.476 < 0.001 − 0.566 < 0.001 − 0.516 < 0.001 − 0.438 < 0.001
ArcCHECK
 MIs − 0.375 < 0.001 − 0.341 0.001 −0.518 < 0.001 − 0.292 0.003
 MIa −0.234 0.019 − 0.234 0.019
 MIc, IMRT −0.225 0.025 −0.228 0.022
 MCS 0.431 < 0.001 0.593 < 0.001 0.451 < 0.001 0.699 < 0.001
 PA −0.235 0.019 − 0.225 0.024
 PI −0.340 0.001 −0.545 < 0.001 −0.328 0.001 −0.677 < 0.001
 PM −0.369 < 0.001 −0.545 < 0.001 − 0.389 < 0.001 − 0.667 < 0.001
  1. Note: rs Spearman’s rho, MIs Modulation index considering multi-leaf collimator speed, MIa Modulation index considering multi-leaf collimator acceleration, MIc, IMRT Modulation index considering multi-leaf collimator acceleration and field aperture irregularity for intensity modulated radiation therapy, MCS Modulation complexity score, PA Plan-averaged beam area, PI Plan-averaged beam irregularity, PM Plan-averaged beam modulation