Abstract #0763

Assessment of MR compatibility for multichannel stimulation using three-axis TMS coil elements

Lucia Navarro de Lara^1,2, Mohammad Daneshzand^1,2, Anthony Mascarenas³, Douglas Paulson³, Sergey Makarov^1,4, Jason Stockmann^1,2, Larry Wald^1,2,5, and Aapo Nummenmaa^1,2

¹Radiology, A.A Martinos Center for Biomedical Imaging/MGH, Charlestown, MA, United States, ²Harvard Medical School, Boston, MA, United States, ³Tristan Technologies, San Diego, CA, United States, ⁴Department of Electrical and Computer Engineering, A.A Martinos Center for Biomedical Imaging/MGH, Worcester, MA, United States, ⁵HST/MIT, Cambridge, MA, United States

We investigate the feasibility of using small-diameter three-axis TMS coil as a basis for constructing a simultaneous stimulation and imaging array. We present an MR-compatible 3-axis TMS coil prototype comprising of three orthogonal coil X/Y/Z units. We assess the influence of the TMS coil element on the MRI images and measure the sound pressure levels with systematically varying the current amplitudes and coil orientation with respect to the magnetic field. Supported by simulations, we conclude that construction of a large-scale multichannel; system using such a 3-axis TMS elements as a basis appears feasible but the acoustic properties should be improved

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