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Table 1 Discrepancies in position detection between ExacTrac and CBCT (N = 42)

From: Stereoscopic X-ray imaging, cone beam CT, and couch positioning in stereotactic radiotherapy of intracranial tumors: preliminary results from a cross-modality pilot installation

  mean ± SD median range 95% (abs.)
lateral +0.1 ± 0.3 +0.1 –0.9 to +0.8 <0.8
longitudinal –0.5 ± 0.4 –0.4 –1.6 to +0.2 <1.2
vertical –0.3 ± 0.5 –0.4 –1.4 to +0.8 <1.0
radial 0.8 ± 0.3 0.8 0.3 to 1.8 <1.4
  1. CBCT Cone Beam Computed Tomography
  2. All units are in mm