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Table 5 Statistics of target volumes and dose quality indexes of the original plan without intra-fractional movements

From: Geometric and dosimetric consequences of intra-fractional movement in single isocenter non-coplanar stereotactic radiosurgery

PTV margin

Quantity

Target volume (cc)

RTOG CI

RTOG HI

GI

(V50%PD/V100%PD)

0 mm

Median

0.23

1.46

1.30

5.13

SD

2.30

0.28

0.06

4.66

1 mm

Median

0.53

1.24

1.35

4.13

SD

3.10

0.13

0.07

2.37

2 mm

Median

0.95

1.19

1.33

4.17

SD

3.89

0.12

0.06

2.12

  1. CI, HI and GI stand for conformity index, homogeneity index and gradient index respectively