Abstract #0913

Convex optimization of MRI exposure for RF-heating mitigation of leaded implants: extended coverage of clinical scenarios at 128 MHz

Earl Zastrow^1,2, Juan Córcoles³, and Niels Kuster^1,2

¹IT'IS Foundation, Zurich, Switzerland, ²Department of Information Technology and Electrical Engineering, ETH-Zurich, Zurich, Switzerland, ³Department of Electronic and Communication Technology, Universidad Autónoma de Madrid, Madrid, Spain

Interactions of long insulated implants with conductive wires (e.g., cardiac pacemaker and deep-brain stimulator) with RF during MRI can lead to excessive local heating of tissue at the vicinity of the implant and is one of the contraindication to MRI. We present the preliminary results of a convex optimization method that can be used to suppress the local deposited power in tissue in a controllable manner. The performance of the proposed method is evaluated, as a function of the trade-off between homogeneity of |B₁⁺| and the mitigated RF-induced power deposition caused by the implant, for multiple clinical scenarios at 128 MHz.

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