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Table 2 Summary of various published recommendations for margins around target volumes (CTV)

From: 4DCT and CBCT based PTV margin in Stereotactic Body Radiotherapy(SBRT) of non-small cell lung tumor adhered to chest wall or diaphragm

Author Region Recipe
Stroom et al.(1999a) [26] PTV 2∑ + 0.7σ
Van Herk et al.(2000) [27] PTV 2.5∑ + 0.7σ
Parker et al. (2002) [28] PTV \( \sum +\sqrt{\left({\sigma}^2+{\sum}^2\right)} \)
Snoke JJ (2007) PTV 2.5∑ + β(σ 2 + σ P 2 )1/2 − βσ P
  1. Symbols: ∑, standard deviation of systematic uncertainties; σ, standard deviation of statistical (random) uncertainties. σ P =0.64, β =0.84.