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Table 1 Accuracy of US image-based localization with and without couplant pad (CP), comparing with CBCT: positioning errors from phantom test with intentional 3-dimensional table shifts (ranged from 1 mm to 30 mm in each direction)

From: A patient-specific three-dimensional couplant pad for ultrasound image-guided radiation therapy: a feasibility study

  LR (mm) AP (mm) IS (mm)
CBCT 0.3 ± 0.3 0.5 ± 0.4 0.6 ± 0.5
US without CP 0.4 ± 0.2 0.6 ± 0.4 0.3 ± 0.3
US with CP 0.3 ± 0.2 0.5 ± 0.3 0.2 ± 0.1
  1. Abbreviations: LR Left-Right, AP Anterior-Posterior, IS Inferior-Superior, CBCT Cone-Beam Computed Tomography, US Ultrasound, CP Couplant Pad