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Abstract #4423

Improved signal linearity for channel-wise relative B1+ mapping at 7T with an interleaved acquisition scheme

Nico Egger1, Laurent Ruck1, Sophia Nagelstraßer1, Judith Schirmer1, Saskia Wildenberg1,2, Jürgen Herrler3, Andreas K. Bitz2, Michael Uder1, and Armin Michael Nagel1,4
1Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany, 2Electrical Engineering and Information Technology, FH Aachen - University of Applied Sciences, Aachen, Germany, 3Siemens Healthcare GmbH, Erlangen, Germany, 4Division of Medical Physics in Radiology, German Cancer Research Centre (DKFZ), Heidelberg, Germany

Synopsis

Keywords: RF Pulse Design & Fields, RF Pulse Design & Fields

Motivation: A common relative B1+ mapping approach relies on channel-wise acquisitions in the small flip angle regime. However, staying within this linear regime is not trivial for certain applications.

Goal(s): We evaluated whether an interleaved acquisition scheme enables a more robust measurement of relative B1+ maps, compared to the conventional sequential scheme.

Approach: For both acquisition schemes, validation phantom measurements were acquired and simulations were performed for phantom, heart and prostate data. The signal linearity was evaluated.

Results: Validation measurements matched well with the simulation results. The interleaved acquisition scheme resulted in smaller errors compared to the sequential scheme in all simulated cases.

Impact: Compared to the conventional sequential scheme, an interleaved acquisition of channel-wise relative B1+ maps mitigates the risk of errors from exceeding the linear regime, enhancing accuracy for applications susceptible to this issue, such as body imaging at 7T.

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