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Abstract #1326

Local SAR minimization of Turbo Spin-Echo sequences by Dynamic RF Shimming

Alessandro Sbrizzi1, Arian Beqiri2, Hans Hoogduin1, Joseph Hajnal2, and Shaihan J Malik2

1UMC Utrecht, Utrecht, Netherlands, 2King's College London

Turbo Spin-Echo sequences (TSE) are frequently characterized by high local specific absorption rate (SAR), a limiting factor for their application. Here we show that the direct signal control (DSC) framework can drastically reduce the local SAR response of a TSE sequence by expanding the search-space for the amplitude and phase RF weights. A solution is found which enforces optimal contrast behavior and local SAR limits across different shim settings. A cardiac exam at 3 Tesla MRI is used as simulated test case.

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