Convex optimization of MRI exposure for RF-heating mitigation of leaded implants: extended coverage of clinical scenarios at 128 MHz
Earl Zastrow1,2, Juan Córcoles3, and Niels Kuster1,2
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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