Skip to main content

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.