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Table 2 PTV margin changes of lung tumor patients

From: Choice of immobilization of stereotactic body radiotherapy in lung tumor patient by BMI

Author

Recipe

PTV margin(mm)

ML

CC

AP

Stroom et al.

2Σ + 0.7σ

2.5

3.3

3.2

van Herk et al.

2.5Σ + 0.7σ

3.0

3.8

3.8

Parker et al.

Σ+ \( \sqrt{\upsigma^2+{\Sigma}^2} \)

2.2

3.0

2.9

Snoke JJ

2.5Σ + β(σ2 + σP

2)1/2 − βσP

2.7

3.6

3.6

  1. Abbreviations: ML medial–lateral, CC cranial–caudal, AP anterior–posterior
  2. Symbols: Σ, standard deviation of systematic uncertainties; σ, standard deviation of statistical (random) uncertainties. σP =0.64, β =0.84