Abstract #4411

Combined EM simulations and measurements of birdcage coil B1+ for designing a 3T multichannel TMS /MRI head coil array

Lucia I Navarro de Lara¹, Laleh Golestani Rad¹, Sergey Makarov^1,2, Jason P Stockmann¹, Lawrence L Wald¹, Thomas Witzel¹, and Aapo Nummenmaa¹

¹Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, ²Worcester Polytechnic Institute, Worcester, MA, United States

The multichannel TMS approach enables steering the stimulation “hot spot” electronically making the execution of concurrent TMS and fMRI experiments potentially more flexible. An integrated multichannel TMS/MRI system is currently under development and here we investigate how TMS coils influences the B₁⁺ field of a birdcage coil. We compare detailed electromagnetic simulations with empirical data using a single three-axis TMS coil element as well as generate simulated data for 4x4 TMS coil array. Both simulations and empirical results indicate that an array of TMS coils should not distort the B₁⁺ significantly at distances bigger than 2cm from the coil.

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