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Table 4 Correlations between global gamma passing rates with various gamma criteria and the modulation indices for intensity modulated radiation therapy plans of Trilogy (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
MI MapCHECK2
 MIs −0.398 < 0.001 −0.386 < 0.001 − 0.347 < 0.001 − 0.323 0.001
 MIa −0.302 0.002 −0.305 0.002 −0.397 < 0.001 − 0.210 0.034
 MIc, IMRT −0.315 < 0.001 −0.320 < 0.001 − 0.400 < 0.001 − 0.230 0.006
 MCS 0.391 <  0.001 0.347 <  0.001 0.377 <  0.001 0.272 0.004
 PA −0.482 <  0.001 − 0.428 <  0.001 −0.655 <  0.001 − 0.286 <  0.001
 PI −0.452 <  0.001 − 0.427 <  0.001 − 0.475 <  0.001 − 0.348 <  0.001
 PM −0.431 0.001 −0.420 0.001 −0.455 <  0.001 − 0.357 0.020
ArcCHECK
 MIs −0.271 0.006 −0.346 <  0.001 −0.355 <  0.001
 MIa −0.364 <  0.001 −0.455 <  0.001 − 0.456 <  0.001 −0.273 0.006
 MIc, IMRT −0.375 <  0.001 −0.471 <  0.001 − 0.472 <  0.001 −0.281 0.004
 MCS 0.426 <  0.001 0.589 <  0.001 0.660 <  0.001
 PA −0.505 <  0.001 − 0.667 <  0.001 −0.739 <  0.001 − 0.370 <  0.001
 PI −0.395 <  0.001 − 0.581 <  0.001 −0.663 <  0.001
 PM −0.410 <  0.001 −0.607 <  0.001 − 0.671 <  0.001 −0.198 0.046
  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