Table 4.
Electrode Tip and Active Electrode MRI Measurements for the Left and Right Hemispheres
| Measure | Electrode Tip | Active Electrode | ||
|---|---|---|---|---|
| Right M(SD) |
Left M(SD) |
Right M(SD) |
Left M(SD) |
|
| Location | ||||
| Entry to target (mm) | 78.4 (5.12) | 78.4 (3.90) | 70.2 (4.47) | 70.7 (5.29) |
| AC-PC midpoint to target (mm) | 4.85 (1.64) | 4.16 (1.38) | 12.1 (1.59) | 13.4 (1.54) |
| Angle Measurements | ||||
| Entry to target | ||||
| Midsagittal | 10.8 (4.61) | 8.61 (4.69) | 10.5 (4.36) | 8.72 (5.04) |
| Axial | 76.6 (8.08) | 73.8 (8.20) | 76.1 (8.37) | 74.1 (8.20) |
| AC-PC midpoint to target | ||||
| Midsagittal | 48.9 (7.820 | 53.8 (6.80) | 79.3 (10.9) | 75.2 (9.81) |
| Axial | 66.6 (7.50) | 59.2 (10.3) | 13.8 (39.5) | 31.5 (42.1) |
| Distance off Approximated STN | ||||
| Entry to Target (mm) | 2.21 (1.02) | 1.54 (0.79) | 2.30 (0.98) | 1.51 (0.84) |
| AC-PC midpoint to target (mm) | 4.59 (1.86) | 4.08 (1.48) | 4.22 (2.26) | 3.32 (2.15) |
| Distance Past Approximated STN | ||||
| Entry to Target (mm) | 5.02 (2.41) | 5.07 (1.93) | −2.38 (4.66) | −0.82 (4.24) |
| AC-PC midpoint to target (mm) | 1.61 (5.48) | 5.03 (3.43) | 3.01(8.16) | 3.09 (5.87) |