Table 1.
Dorsal STN border comparison between 7-T T2 MRI and MER
| Channels | Trajectories traversing STN on 7.0-T MRI | Trajectories showing typical electrophysiological STN activity | 7.0-T dorsal STN border = MER dorsal STN border | 7.0-T dorsal STN border more dorsal than MER dorsal STN border | 7.0-T dorsal STN border more ventral than MER dorsal STN border | Difference between 7.0-T and MER dorsal STN border, mm | Trajectory used for final electrode placement | Difference between 7.0-T and MER used for dorsal STN border placement, mm |
|---|---|---|---|---|---|---|---|---|
| Central (n = 36) | 35 | 29 (83) | 0 (0) | 25 (86) | 4 (14) | −1.9±1.4 (−4.4 to +1.5)* | 21 (58) | −2.0±1.1 (−3.2 to +1.4) |
| Anterior (n = 36) | 34 | 26 (76) | 1 (4) | 18 (69) | 7 (27) | −0.5±1.7 (−3.2 to +3.5)* | 12 (33) | +0.1±2.1 (−2.8 to + 3.5) |
| Lateral (n = 30) | 20 | 20 (100) | 1 (5) | 12 (60) | 7 (35) | +0.0±1.7 (−2.1 to +2.9) | 3 (8) | −0.5±0.0 (−0.5 to +0.5) |
| All (n = 102) | 89 | 75 (84) | 2 (3) | 55 (73) | 18 (24) | −0.9±1.7 (−4.4 to +3.5)* | 36 (100) | −1.3±1.8 (−3.2 to +3.5) |
For the trajectory distance between dorsolateral STN border, minus indicates MRI border to be located dorsal relative to the electrophysiological border and plus indicates MRI border to be located ventral relative to the electrophysiological border. In columns 3–6, the numbers (%) of trajectories are given. In column 7, differences ± standard deviations (range) are stated.
*
p < 0.05.