Table 3 Comparison of the CI and HI for the targets between SEB-HFWBI and SIB-HFWBI plans in the same position (mean).

From: A comparative study on hypofractionated whole-breast irradiation with sequential or simultaneous integrated boost on different positions after breast-conserving surgery

Parameters

SEB-HFWBI

SIB-HFWBI

T-value

P-value

Supine

PTVSupine-TB

CI

0.48 ± 0.06

0.58 ± 0.07

 − 8.114

0.000

HI

0.09 ± 0.01

0.10 ± 0.01

 − 6.552

0.000

PTVSupine-WB

CI

0.63 ± 0.07

0.66 ± 0.06

 − 13.356

0.000

PTVSupine-WB-PTVSupine-TB

HI

0.31 ± 0.02

0.19 ± 0.02

34.467

0.000

Prone

PTVProne-TB

CI

0.46 ± 0.08

0.54 ± 0.09

 − 8.114

0.000

HI

0.09 ± 0.02

0.10 ± 0.01

 − 6.552

0.000

PTVProne-WB

CI

0.68 ± 0.07

0.71 ± 0.07

 − 13.356

0.000

PTVProne-WB-PTVProne-TB

HI

0.31 ± 0.02

0.21 ± 0.02

34.467

0.000

  1. TB tumor bed, PTVTB planning target volume for the TB, WB whole breast, PTVWB planning target volume for the WB, SIB simultaneous integrated boost, SEB sequential integrated boost, HFWBI hypofractionated whole-breast irradiation, CI conformal index, HI homogeneity index, PTVsupine-WB-PTVsupine-TB the target volume obtained by subtracting the PTVTB from the PTVWB in supine position, PTVprone-WB-PTVprone-TB the target volume obtained by subtracting the PTVTB from the PTVWB in prone position.
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