Table 6 Dosimetric evaluation of the targets for the SEB-HFWBI or SIB-HFWBI treatment plan in the supine and prone positions (median).

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

Parameters

Supine

Prone

Z-value

P-value

SEB-HFWBI

PTVTB

Dmean (Gy)

53.11 (51.78–54.79)

53.57 (51.42–54.24)

 − 2.478

0.013

V100%

99.35 (95.80–99.97)

99.30 (92.00–99.90)

 − 0.577

0.564

PTVWB

V100%

98.10 (96.40–99.60)

98.30 (86.50–100.00)

 − 0.748

0.455

CI

0.63 (0.47–0.75)

0.69 (0.50–0.82)

 − 3.340

0.001

PTVWB-PTVTB

V100%

12.65 (4.00–25.70)

20.4 (5.20–32.40)

 − 3.908

0.000

SIB-HFWBI

PTVTB

Dmean (Gy)

51.04(49.77–52.66)

51.95 (50.13–57.98)

 − 2.036

0.021

V100%

98.55 (95.50–99.80)

98.40 (93.70–99.90)

 − 0.068

0.946

PTVWB

V100%

96.55 (86.30–98.50)

96.55 (95.10–98.40)

 − 0.216

0.829

CI

0.66 (0.50–0.77)

0.72 (0.52–0.83)

 − 3.501

0.000

PTVWB-PTVTB

V100%

8.60 (2.60–14.70)

13.55 (3.80–36.20)

 − 4.165

0.000

  1. TB tumor bed, PTVTB planning target volume for TB, WB whole breast, PTVWB planning target volume for WB, PTVWB-PTVTB the target volume obtained by subtracting the PTVTB from the PTVWB, SIB simultaneous integrated boost, SEB sequential integrated boost, HFWBI hypofractionated whole-breast irradiation, CI conformal index, Dmean mean dose, V100% the PTV coverage percent of the 100% prescribed dose line including PTVTB, PTVWB, PTVWB-PTVTB in the treatment plan under supine and prone positions.
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