Abstract
Electrical field measurements and simulations of the H7 and D-B80 coils: Non-equivalence of the TMS coils for obsessive compulsive disorder
Highlights
We compared the induced electric field (EF) characteristics between the coils in the treatment position for obsessive-compulsive disorder (OCD) through EF measurements of a saline solution head model and high-resolution electric field simulations of various anatomical models
The distribution of values of EF intensity was determined in the following areas relevant to the circuitry of OCD: (i) presupplementary motor area, (ii) inferior frontal gyrus (IFG), (iii) dorsolateral prefrontal cortex, (iv) orbitofrontal cortex (OFC), (v) dorsal anterior cingulate cortex
A bubble plot is shown in Fig. 1c where the y axis is the d100, and for each model is presented a bubble for the D-B80 and H7 coils, with the bubble size proportional to V100 value which is shown in each bubble
Summary
We compared the induced electric field (EF) characteristics between the coils in the treatment position for OCD through EF measurements of a saline solution head model and high-resolution electric field simulations of various anatomical models. The distribution of values of EF intensity was determined in the following areas relevant to the circuitry of OCD: (i) presupplementary motor area (pre-SMA), (ii) inferior frontal gyrus (IFG), (iii) dorsolateral prefrontal cortex (dlPFC), (iv) orbitofrontal cortex (OFC), (v) dorsal anterior cingulate cortex (dACC). Both phantom measurements and simulation showed that the H7 coil stimulates much larger and deeper brain volume and induces higher field intensities than the D-B80.
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