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Table 2 Systematic Σ and random σ setup error depending on surrogate used for matching the CBCT 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 1.92 1.87
  lng 1.72 1.69
  lat 0.61 0.90
Balloon vrt 1.68 1.82
  lng 1.20 1.66
Soft tissue vrt 0.77 1.09
  lng 0.36 0.17
   0.49 0.93
  1. Fiducial marker matching in CBCT was taken as a reference.