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Table 2 Improvement after correction and re-verification by ExacTrac (N = 70)

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.)
Before correction by ExacTrac
 lateral –0.7 ± 2.3 –0.7 –7.7 to +5.9 <5.2
 longitudinal +0.3 ± 1.5 +0.2 –3.6 to +4.6 <3.5
 vertical –1.2 ± 1.8 –0.8 –10.7 to +1.3 <3.1
 radial 2.9 ± 2.0 2.3 0.2 to 11.8 <6.1
After correction by ExacTrac
 lateral +0.03 ± 0.25 +0.02 –0.40 to +1.13 <0.38
 longitudinal –0.02 ± 0.21 –0.04 –0.54 to +0.95 <0.40
 vertical +0.01 ± 0.22 +0.01 –0.67 to +0.56 <0.51
 radial 0.32 ± 0.22 0.26 0.07 to 1.33 <0.69
  1. All units are in mm