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Table 2 Compared to 3D plans, number of cases that is dosimetrically in favor of the VMAT or FFF plans.

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

Index CI CN GI V5 V20 MLD MTD MU
Coplanar VMAT 14 14 12 12 13 15 5 0
Non-coplanar VMAT 14 14 12 13 14 14 8 2
Non-coplanar FFF-VMAT 15 15 13 14 15 14 11 0
  1. The total number of cases is 15. 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.