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Abstract #0929

Feedback field control improves the accuracy of T 2 * mapping at 7T

Michael Wyss 1 , Yolanda Duerst 1 , Bertram Wilm 1 , David Brunner 1 , Benjamin Dietrich 1 , Thomas Schmid 1 , Christoph Barmet 1,2 , and Klaas Pruessmann 1

1 Institute for Biomedical Engineering, University of Zurich and ETH, Zurich, Zurich, Switzerland, 2 Skope Magnetic Resonance Technologies, Zurich, Switzerland

At high field strength T2* weighted imaging suffers from artifacts due to field fluctuations generated by patient breathing and motion. We propose to employ a real-time higher order field feedback system based on NMR field sensors providing full 3rd order real-time field compensation. In this work the effectiveness of the system is quantified for T2* mapping. Field feedback was demonstrated to improve data accuracy of T2* mapping at 7T, which was evaluated in phantom experiments and in-vivo. The method may as well be beneficial to improve image quality and data accuracy in susceptibility weighted imaging and quantitative susceptibility mapping.

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