Abstract #3659

Heating Reduction in Unilateral And Bilateral Implanted Leads At 3T Using Parallel Radiofrequency Transmission in a Heterogeneous Head Model

Clare McElcheran¹, Laleh Golenstani-Rad², and Simon Graham³

¹University of Toronto, Toronto, ON, Canada, ²Massachusetts General Hospital, Charlestown, MA, United States, ³Sunnybrook Health Sciences Centre, Toronto, ON, Canada

Long implanted wires, such as deep brain stimulation (DBS) implants, are subject to radiofrequency (RF) heating during MRI. In previous work, RF shimming was used to tailor the electric and magnetic fields creating optimal excitation and minimal heating in a uniform cylindrical medium with a single, straight, implanted copper wire at 3T. This work extends the methodology to a complex, heterogeneous head model with one or two implanted, curved copper wire(s). A substantial improvement in both B₁⁺-field homogeneity and E-field reduction is achieved when compared with a transmit/receive birdcage coil in both the single wire and bilateral wire case.

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