Abstract #1590

Designing a multichannel TMS/MRI system for 3 T: a 7-channel RF receive-only coil array prototype

Lucia I. Navarro de Lara^1,2, Anthony Mascarenas³, Douglas Paulson³, Sergey Makarov⁴, Jason P. Stockmann^1,2, Lawrence L. Wald^1,2, and Aapo Nummenmaa^1,2

¹Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ²Radiology, Harvard Medical School, Boston, MA, United States, ³Tristan Technologies, San Diego, CA, United States, ⁴Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, MA, United States

An integrated multichannel TMS/MRI head coil array for 3T is currently under development to enable electronically controlled multifocal TMS with concurrent whole-head fMRI. To test the feasibility of the proposed RF hardware design, a 7-channel RF receive-only coil array prototype was built. Calculated B⁺₁ maps showed the attenuating effect of the TMS coil on the transmit field. The improvement by retuning the affected RF loops was demonstrated using MPRAGE images. Functional images showed no additional artefacts when TMS pulses were interleaved between the EPI volumes. The prototype results support our RF hardware design approach for the TMS/MRI system.

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