An Algorithm for Maximum-SAR Targeted RF Hyperthermia

While shorter electromagnetic wavelengths and resulting SAR hotspots are a source of concern in ultra-high field MRI, the same phenomenon can be desirable in the field of targeted RF hyperthermia. In this work, we describe the maxSAR pulse design problem and implement a nonconvex interior-point algorithm to solve it. We demonstrate in simulation that an 8-loop pTx array operating at 298 MHz (7T), can be used to intentionally produce localized hotspots at arbitrarily located target regions while still constraining the SAR at healthy voxels to be within the local SAR regulatory limit.

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