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Table 1 Detection of errors during vDIBH and requirement for PTV margins

From: Appropriate margin for planning target volume for breast radiotherapy during deep inspiration breath-hold by variance component analysis

 

(mm)

95% CI (mm)

vDIBH error

  

 Inter-patient (∑pt)

0.82

0.59 to 1.13

 Inter-fraction (σfr)

1.19

1.11 to 1.29

 Intra-fraction (σintra)

1.63

1.63 to 1.64

 Overall mean (M)

0.30

 − 0.05 to 0.65

Systematic and random error

  

 Effective systematic (∑eff)

0.87

–

 Effective random (σeff)

2.00

–

PTV margin

3.59

–

  1. vDIBH, voluntary deep inspiration breath-hold; CI, confidence interval; PTV, planning target volume