Table 2.
The Anthropomorphic Phantom Study. (Left) Setup Discrepancies Between ExacTrac X-ray and kV-CBCT and (Right) ExacTrac X-ray Accuracy When Known Offsets for the 6 Translational and Rotational Movements Were Applied.
| Motions | Discrepancies ExacTrac X-ray versus kV-CBCT phantom study | ExacTrac X-ray accuracy phantom study | |||||
|---|---|---|---|---|---|---|---|
| RMS | SD | Max | p-value | RMS | SD | Max | |
| Translations(mm) | |||||||
| Vert. (AP) | 0.23 | 0.14 | 0.61 | .042 | 0.17 | 0.10 | 0.38 |
| Long. (SI) | 0.47 | 0.23 | 0.84 | <.001 | 0.13 | 0.10 | 0.47 |
| Lat. (LR) | 0.52 | 0.19 | 0.97 | <.001 | 0.11 | 0.06 | 0.68 |
| Rotations (°) | |||||||
| Pitch (Rx) | 0.20 | 0.12 | 0.48 | <.001 | 0.11 | 0.06 | 0.25 |
| Roll (Rz) | 0.31 | 0.18 | 0.68 | .005 | 0.19 | 0.11 | 0.37 |
| Yaw (Ry) | 0.30 | 0.14 | 0.53 | <.001 | 0.12 | 0.07 | 0.25 |
kV-CBCT, kV-cone beam computed tomography; RMS = root-mean-square.