2017 Volume 55Annual Issue 4AM-Abstract Pages 277
Transcranial Magnetic Stimulation is effective for treatment of brain dysfunctions. We have developed a new coil, a double-D coil. The coil was designed with simulations to be able to maintain steady stimulation at target when it is displaced from the optimal spot. In this study, five healthy subjects participated voluntarily, and the double-D coil was assessed experimentally. For comparison, a figure-8 coil was also used. A subject was stimulated at 200 points around the left primary motor cortex by each coil. Motor evoked potential was recorded at the first dorsal interosseous and its amplitude was mapped on the coordinate axes. The distributions of them were arranged with a Gaussian function. The half-value width of the short axis improved 1.6 times, whereas that of the long axis increased 1.5 times. The results showed the double-D coil is less affected by the coil displacement than the figure-8 coil.
