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Table 3 Comparison of patient setup errors between CBCT and US image-based localization with and without couplant pad (CP)

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

  CBCT vs. US without CP CBCT vs. US with CP
LR (mm) − 0.3 ± 2.3 0.3 ± 1.9
AP (mm) −1.9 ± 1.8 −0.8 ± 1.6
IS (mm) 0.8 ± 1.4 1.3 ± 1.2
3D (mm) 3.4 ± 1.4 2.9 ± 1.2
  1. Abbreviations: LR Left-Right, AP Anterior-Posterior, IS Inferior-Superior, 3D the amplitude of three-dimensional vector, CBCT Cone-Beam Computed Tomography, US Ultrasound, CP Couplant Pad