Skip to main content

Table 1 Summary of indices about the PTV

From: Non-coplanar volumetric-modulated arc therapy (VMAT) for craniopharyngiomas reduces radiation doses to the bilateral hippocampus: a planning study comparing dynamic conformal arc therapy, coplanar VMAT, and non-coplanar VMAT

Index

DCAT

coVMAT

ncVMAT

P-value (ANOVA)

P-value (DCAT vs. coVMAT)

P-value (DCAT vs. ncVMAT)

P-value (coVMAT vs. ncVMAT)

(Mean ± SD)

HI

0.114 ± 0.010

0.103 ± 0.008

0.099 ± 0.005

<0.05

<0.05

<0.05

0.676

RTOG-CI

1.758 ± 0.672

1.378 ± 0.138

1.429 ± 0.175

0.112

   

IP-CI

0.615 ± 0.164

0.717 ± 0.069

0.694 ± 0.078

0.123

   

D2% (Gy)

54.0 ± 0.6

53.1 ± 0.6

52.9 ± 0.5

<0.05

<0.05

<0.05

1

D98% (Gy)

48.0 ± 0.2

47.8 ± 0.2

47.8 ± 0.2

0.101

   

Dmean (Gy)

52.3 ± 0.4

51.7 ± 1.3

51.4 ± 0.5

0.077

   
  1. If a significant difference was evident when data from the entire cohort were compared via two-way analysis of variance (ANOVA), the Bonferroni post hoc test was performed to compare pairs of modalities
  2. PTV planning target volume, DCAT dynamic conformal arc therapy, coVMAT coplanar volumetric-modulated arc therapy, ncVMAT non-coplanar volumetric-modulated arc therapy
  3. HI homogeneity index, CI conformity index, RTOG-CI CI as defined by the Radiation Therapy Oncology Group (RTOG), IP-CI CI as defined by Paddick et al. [19], D2% dose to 2 % of the volume, D98% dose to 98 % of the volume, Dmean mean dose