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Table 1 Systematic Σ and random σ setup error depending on surrogate used for matching kV/kV images to the reference CT

From: PTV margin definition in hypofractionated IGRT of localized prostate cancer using cone beam CT and orthogonal image pairs with fiducial markers

  Σ (mm) σ (mm)
Bones vrt 1.78 1.97
  lng 1.39 2.30
  lat 0.77 0.85
Balloon vrt 1.53 1.36
  lng 3.20 3.15
  lat 1.70 1.35
FM vrt 0.88 0.71
  lng 1.16 0.46
  lat 0.46 0.37