Table IV.
TMS stimulation intensity
| Group | % Output | E at scalp (V/m) | M1 depth (mm) | E at M1 (V/m)* |
|---|---|---|---|---|
| PET Responders | ||||
| 1246 | 80 | 348 | 38 | 87 |
| 1265 | 66 | 284 | 26 | 96 |
| 1280 | 75 | 325 | 37 | 73 |
| 1281 | 72 | 312 | 27 | 125 |
| 1286 | 55 | 235 | 31 | 66 |
| 1316 | 72 | 312 | 22 | 137 |
| 1355 | 62 | 267* | 29 | 73 |
| Mean | 68.9 | 297.8 | 29.9 | 94.1 |
| Non‐responders | ||||
| 1266 | 62 | 270 | 29 | 87 |
| 1285 | 75 | 326 | 21 | 120 |
| 1328 | 72 | 269 | 32 | 91 |
| 1329 | 70 | 304 | 44 | 87 |
| Mean | 67.3 | 292.5 | 27.3 | 96.1 |
There was no difference in intensity of the applied E field between subjects in whom a cortical response to TMS was observed with PET (n = 7) and those in whom a cortical response to transcranial magnetic stimulation (TMS) was not observed with PET (n = 4). % Output, percentage of maximum output of the coil. E, E fields; M1 depth, depth of M1 response to voluntary finger movement from the scalp surface.
*
E at M1 is the absolute E field at the depth of M1.