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Table 1 Dosimetric data of 3D, coplanar, non-coplanar VMAT and FFF-VMAT plans.

From: Volumetric modulated arc planning for lung stereotactic body radiotherapy using conventional and unflattened photon beams: a dosimetric comparison with 3D technique

Plan 3D Coplanar VMAT Non-coplanar VMAT Non-coplanar FFF-VMAT
CI 1.44 ± 0.21 1.23 ± 0.20 1.22 ± 0.17 1.19 ± 0.13
CN 0.67 ± 0.09 0.79 ± 0.09 0.79 ± 0.08 0.81 ± 0.07
GI 7.12 ± 1.43 6.49 ± 1.90 6.41 ± 1.78 6.23 ± 1.59
V20 (%) 6.8 ± 2.9 5.8 ± 2.4 5.8 ± 2.3 5.6 ± 2.3
V5 (%) 23.5 ± 8.0 20.9 ± 7.4 21.0 ± 7.2 20.4 ± 7.1
MLD (cGy) 497 ± 153 458 ± 144 459 ± 140 449 ± 142
MTD (cGy) 5359 ± 101 5370 ± 116 5361 ± 104 5324 ± 83
MU 1528 ± 136 1708 ± 194 1660 ± 200 1805 ± 258
  1. In the table, CI = conformity index, CN = conformity number, GI = gradient index, V20 is the percentage volume of lung-GTV exceeding 20 Gy, V5 is the percentage volume of lung-GTV exceeding 5 Gy, MLD = mean lung dose, MTD = mean target dose and MU = number of monitor units.