Table 4 Correlation of DCAT/VMAT ratios of some plan parameters (statistically different) with PTV volume.

From: Novel DCAT plans in stereotactic body radiotherapy for stage I/II centrally located non-small-cell lung cancer

Item

ρ

P Value

CI

−0.173

0.407

HI

−0.498

0.011*

D2cm

−2.86

0.166

R50%

0.550

0.004*

Ipsilateral Lung V5Gy

−0.137

0.513

Ipsilateral Lung V20Gy

−0.264

0.203

Lung All V5Gy

−0.357

0.080

Lung All V20Gy

−0.390

0.054

Segments

−0.53

0.006*

MUs

−0.04

0.850

BOT

−0.09

0.669

  1. The content in Item refers to the corresponding DCAT/VMAT ratio. A statistically significant difference to the VMAT result is indicated by an asterisk (*). Abbreviations: PTV planning target volume, CI conformity index, HI homogeneity index, DCAT dynamic conformal arc therapy, VMAT volumetric-modulated arc therapy, D2cm the maximum dose at any point ≥ 2 cm from the PTV in any direction, R50% the ratio of the volume encircled by the 50% prescription isodose line to the PTV volume, MUs monitor units, BOT beam-on time.
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