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Table 3 Repeatability of position detection by ExacTrac (N = 14)

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 range 95% (abs.) 50% (abs.)
Difference before – after
 lateral –0.08 ± 0.52 –0.94 to +0.53 <0.8 <0.5
 longitudinal –0.05 ± 0.70 –0.74 to +1.01 <0.8 <0.1
 vertical –0.03 ± 0.42 –0.67 to +0.83 <0.7 <0.3
 radial 0.73 ± 0.32 0.26 to 1.28 <1.2 <0.7
  1. All units are in mm