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)
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) |