Table 1 Quantitative results of 15 procedures in twelve patients, chronological order
No | Needle-nerve root distance (mm) | Needle angulation (°) | MRI room occupation time (min) | Nominal needle diameter (mm) | FWHM needle artifact (mm) | FWHM needle artifact ratio* | Visual artifact (mm) | Visual artifact ratio |
|---|---|---|---|---|---|---|---|---|
1 | 2.62 | 25.0 | 70 | 0.9 | 5.16 | 5.73 | 3.66 | 4.07 |
2 | 3.56 | 27.9 | 55 | 0.9 | 4.94 | 5.49 | 3.06 | 3.40 |
3 | 0.99 | 22.5 | 60 | 0.9 | 4.49 | 4.99 | 1.35 | 1.50 |
4 | 1.95 | 22.7 | 65 | 0.9 | 3.98 | 4.42 | 2.68 | 2.98 |
5 | 3.89 | 16.6 | 55 | 0.9 | 4.73 | 5.26 | 1.49 | 1.66 |
6 | 2.69 | 13.0 | 54 | 0.9 | 4.73 | 5.26 | 2.34 | 2.60 |
7 | 1.41 | 8.2 | 50 | 0.9 | 3.14 | 3.49 | 2.99 | 3.32 |
8 | 4.73 | 21.2 | 64 | 0.9 | 2.57 | 2.86 | 1.54 | 1.71 |
9 | 3.20 | 6.9 | 49 | 0.9 | 3.55 | 3.94 | 1.71 | 1.90 |
10 | 0.10 | 24.6 | 40 | 0.9 | 4.84 | 5.38 | 1.83 | 2.03 |
11 | 1.39 | 33.4 | 40 | 0.9 | 3.75 | 4.17 | 2.11 | 2.34 |
12 | 1.89 | 14.3 | 39 | 0.9 | 3.04 | 3.38 | 2.12 | 2.36 |
13 | 1.87 | 27.2 | 41 | 0.9 | 2.81 | 3.12 | 2.02 | 2.24 |
14 | 0.10 | 12.4 | 44 | 0.9 | 3.05 | 3.39 | 1.49 | 1.66 |
15 | 0.83 | 11.2 | 40 | 0.9 | 2.81 | 3.12 | 1.42 | 1.58 |
Mean | 2.08 | 19.1 | 51 | 3.8 | 4.27 | 2.12 | 2.36 | |
SD | 1.36 | 7.9 | 11.9 | 0.91 | 1.01 | 0.69 | 0.78 |