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Table 1 The average values of various modulation indices for intensity modulated radiation therapy plans

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

  MIs (×  10− 3) MIa (×  10− 2) MIc, IMRT (×  10− 1) MCS (×  10− 1) PA (×  10− 1) PI (×  10− 1) PM
TrueBeam STx
 Lung SABR (n = 20) 7.97 ± 1.41 2.67 ± 0.69 0.31 ± 0.08 1.25 ± 0.18 1.01 ± 0.45 0.73 ± 0.18 0.67 ± 0.05
 Spine SABR (n = 20) 5.62 ± 1.48 1.46 ± 0.48 0.17 ± 0.05 0.64 ± 0.19 1.13 ± 0.53 1.53 ± 1.35 0.86 ± 0.05
 Liver SABR (n = 20) 7.83 ± 2.46 2.40 ± 0.60 0.27 ± 0.06 1.11 ± 0.42 1.39 ± 0.67 1.03 ± 0.65 0.73 ± 0.12
 Brain (n = 20) 9.20 ± 2.56 9.06 ± 2.62 1.01 ± 0.28 1.40 ± 0.46 3.72 ± 1.85 0.70 ± 0.27 0.67 ± 0.13
 Head and neck (n = 20) 6.12 ± 2.24 7.06 ± 1.52 0.82 ± 0.17 0.35 ± 0.08 3.72 ± 0.82 2.30 ± 0.43 0.93 ± 0.02
Trilogy
 Head and neck (n = 40) 4.14 ± 1.11 5.94 ± 0.83 0.70 ± 0.10 0.30 ± 0.05 2.27 ± 0.41 1.87 ± 0.22 0.94 ± 0.01
 Prostate primary (n = 21) 3.34 ± 0.71 4.95 ± 0.79 0.58 ± 0.09 0.81 ± 0.14 0.95 ± 0.22 0.64 ± 0.11 0.79 ± 0.04
 Prostate boost (n = 21) 3.18 ± 0.43 4.89 ± 0.65 0.57 ± 0.07 0.94 ± 0.13 0.90 ± 0.14 0.47 ± 0.10 0.72 ± 0.04
 Liver (n = 11) 5.14 ± 2.14 6.93 ± 1.40 0.80 ± 0.16 0.78 ± 0.24 1.72 ± 0.60 0.94 ± 0.54 0.79 ± 0.07
 Spine (n = 9) 5.46 ± 2.68 4.02 ± 1.55 0.47 ± 0.17 0.63 ± 0.25 2.01 ± 1.40 1.26 ± 0.82 0.86 ± 0.06
  1. Note: 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, SABR Stereotactic ablative radiotherapy, Prostate primary Prostate primary plan, Prostate boost Prostate boost plan