Table 7.
A comparison of fiducial localization to pretreatment CBCT localization for actual patients with a mix of primary stereotactic reference image types (MRI and CT).
| Patient site | X (mm) | Y (mm) | Z (mm) | X rotation (°) | Y rotation (°) | Z rotation (°) | 3D translation (mm) | Primary stereotactic reference |
|---|---|---|---|---|---|---|---|---|
| 1 | −0.1 | 0.06 | 0.05 | −0.19 | 0.02 | 0.05 | 0.13 | CT |
| 2 | −0.23 | −0.17 | 0.19 | 0.16 | 0.56 | −0.05 | 0.34 | CT |
| 3 | −0.85 | 0.25 | 0.47 | −0.07 | 0.23 | −0.15 | 1.00 | CT |
| 4 | −0.01 | 0.22 | 0.23 | −0.01 | 0.53 | −0.11 | 0.32 | CT |
| 5 | −0.15 | 0.35 | −0.07 | 0.75 | 0.11 | −0.1 | 0.39 | MRI |
| 6 | 0.05 | 0.2 | −0.1 | −0.49 | 0.24 | 0.63 | 0.23 | MRI |
| 7 | 0.45 | −0.21 | 0.08 | 0 | −0.02 | −0.19 | 0.50 | CT |
| 8 | 0.15 | −0.04 | 0.15 | 0.09 | 0.25 | −0.04 | 0.22 | CT |
| 9 | 0.1 | −0.39 | −0.37 | 0.45 | −0.12 | 0.17 | 0.55 | MRI |
| 10 | 0.27 | 0 | 0.7 | 0.61 | 0.34 | 0.39 | 0.75 | MRI |
| 11 | 0.57 | −0.54 | −0.24 | 0.91 | 0.12 | 0.49 | 0.82 | MRI |
| 12 | 0.06 | −0.11 | 0.3 | 0.15 | −0.02 | 0.02 | 0.33 | CT |
| 13 | −0.19 | −0.16 | 0.15 | 0.77 | −0.43 | −0.03 | 0.29 | MRI |
| 14 | −0.28 | −0.03 | 0.27 | 0.49 | 0.08 | 0.17 | 0.39 | MRI |
| 15 | −0.04 | −0.03 | 0.34 | −0.01 | 0.13 | −0.01 | 0.34 | CT |
| 16 | −0.2 | −0.06 | −0.17 | −0.01 | 0.35 | −0.08 | 0.27 | CT |
| 17 | 0.14 | 0.17 | 0.2 | 0.1 | 0.38 | 0.04 | 0.30 | CT |
| 18 | −0.5 | 0.08 | −0.2 | −0.5 | 0.08 | −0.2 | 0.54 | MRI |
| 19 | 0.49 | −0.11 | −0.42 | −0.4 | −0.2 | 0.06 | 0.66 | CT |
| 20 | −0.35 | 0.11 | 0.12 | 0.07 | 0.16 | −0.18 | 0.39 | CT |
| 21 | −1.21 | 0.24 | 0.68 | 0.81 | −0.64 | −0.16 | 1.41 | MRI |
| 22 | −1.27 | 0.09 | 0.87 | 0.39 | −0.41 | −0.33 | 1.54 | CT |
| 23 | 0.41 | −0.44 | 0.48 | 0.15 | 0.1 | 0.03 | 0.77 | CT |
| 24 | 0.17 | 0.22 | 0.16 | −0.16 | 0.42 | 0.05 | 0.32 | CT |
| 25 | −0.14 | −0.75 | −0.26 | 0.66 | −0.14 | −0.12 | 0.81 | MRI |
| 26 | −0.28 | −0.06 | −0.08 | 0.47 | −0.14 | 0.24 | 0.30 | MRI |
| 27 | 0.34 | 0.19 | 0.04 | 0.39 | 0.24 | 0.38 | 0.39 | MRI |
| 28 | −0.08 | 0.36 | −0.12 | −0.48 | 0.51 | −0.15 | 0.39 | CT |
| 29 | 0.29 | 0.16 | 0.29 | −0.21 | 0.56 | 0.03 | 0.44 | CT |
| CT average (absolute) | −0.06 | 0.03 | 0.19 | −0.03 | 0.21 | −0.06 | 0.49 | |
| CT maximum (absolute) | 0.49 | 0.36 | 0.87 | 0.39 | 0.56 | 0.06 | 1.54 | |
| MRI average (absolute) | −0.12 | −0.07 | 0.04 | 0.44 | −0.02 | 0.16 | 0.57 | |
| MRI maximum (absolute) | 0.57 | 0.35 | 0.70 | 0.91 | 0.34 | 0.63 | 1.41 | |
| Significance between MRI and CT (P − value) | 0.72 | 0.32 | 0.23 | 0.00 | 0.04 | 0.01 | 0.51 | |
| Total average (absolute) | 0.11 | 0.01 | 0.16 | 0.32 | 0.25 | 0.16 | 0.52 | |
| Total maximum (absolute) | 1.27 | 0.54 | 0.87 | 0.91 | 0.56 | 0.63 | 1.54 |
Abbreviations: CT, computed tomography; CBCT, cone beam CT; MRI, magnetic resonance imaging.