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Abstract #0352

A method to approximate maximum local SAR in multi-channel transmit MR systems without transmit phase information

Stephan Orzada1, Mark E. Ladd1,2, and Andreas K. Bitz2

1Erwin L. Hahn Institute, Essen, Germany, 2Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany

The capability of multi-channel transmit systems to drive different waveforms in the individual transmit channels results in an increased complexity for the SAR supervision In this work we propose a method based on virtual observation points (VOPs) to derive a conservative upper bound for the local SAR with a reasonable safety margin without knowledge of the transmit phases of the channels. In six different scenarios we demonstrate that the proposed method can be superior to the simple worst case method often used when only amplitude and no phase information is available.

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