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Table. 3 Homogeneity and conformity indices for orig. VMAT and IMRT MRL plans with orig. PTV margins and red. PTV margins. Additionally, V40Gy and V25Gy and the average number of MU per fraction and the estimated treatment delivery time for the VMAT and IMRT MRL plans with orig. and red. PTV margins are shown. The results presented are mean values ± standard deviation. The p-values for the VMAT and IMRT MRL comparisons for both orig. and red. PTV margins are also indicated

From: Dosimetric comparison of MR-linac-based IMRT and conventional VMAT treatment plans for prostate cancer

  VMAT (orig. PTV margins) IMRT MRL (orig. PTV margins) IMRT MRL (red. PTV margins)
Homogeneity (HI) 0.08 ± 0.01 0.08 ± 0.01 0.08 ± 0.01
p value   0.7 0.4
Conformity (CI) 0.89 ± 0.05 0.87 ± 0.06 0.85 ± 0.05
p value   0.049 0.016
V40Gy (% relative to VMAT) 100 ± 0.0 103 ± 8 81 ± 9
p value   0.1 ≤ 1 × 10− 5
V25Gy (% relative to VMAT) 100 ± 0.0 114 ± 9 89 ± 11
p value   ≤ 1 × 10− 5 0.001
MU 639 ± 69 748 ± 61 796 ± 75
p value   ≤ 1 × 10− 5 ≤ 1 × 10− 5
Predicted treatment delivery time (min) 2.1 ± 0.0 9.4 ± 0.8 9.1 ± 0.6
p value   ≤ 1 × 10− 5 1 × 10− 5