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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.