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Table 5 Correlations of the averaged multi-leaf collimator positional errors to the modulation indices (p ≤ 0.05)

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

  TrueBeam STx Trilogy
r s p r s p
MIs 0.411 < 0.001 0.213 0.032
MIa 0.783 < 0.001 0.489 < 0.001
MIc, IMRT 0.887 < 0.001 0.504 < 0.001
MCS −0.727 < 0.001
PA 0.841 < 0.001 0.909 < 0.001
PI 0.861 < 0.001 0.767 < 0.001
PM 0.751 < 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