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Table 4 Shifts of a head phantom as preset by the robotic couch and as detected by both ExacTrac and CBCT (N = 24, resp. 8 per axis)

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

Discrepancy between … … ExacTrac and robotic couch … CBCT and robotic couch … ExacTrac and CBCT
 lateral 0.0 ± 0.5 (p = 0.9) 0.0 ± 0.6 (p = 1.0) 0.0 ± 0.1 (p = 0.5)
 longitudinal 0.4 ± 0.3 (p = 0.1) 0.3 ± 0.3 (p = 0.1) 0.1 ± 0.1 (p = 0.3)
 vertical 0.0 ± 0.4 (p = 0.9) 0.0 ± 0.4 (p = 1.0) 0.0 ± 0.1 (p = 0.5)
 radial 0.7 ± 0.3 (p = 0.007) 0.7 ± 0.3 (p = 0.006) 0.1 ± 0.0 (p < 0.001)
  1. All units are in mm, average ± SD (p values from two-sided t-test)