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Abstract #0183

Reduction strategies for breathing motion artifacts in abdominal MR elastography

Mehrgan Shahryari1, Helge Herthum1, Gergely bertalan1, Tom Meyer1, Heiko Tzschätzsch1, Carsten Warmuth1, Jürgen Braun2, and Ingolf Sack1
1Department of Radiology, Charité - Universtitätsmedizin Berlin, Berlin, Germany, 2Institute of Medical Informatics, Charité - Universtitätsmedizin Berlin, Berlin, Germany

MR elastography can provide high-resolution stiffness maps of abdominal organs. However, MRE – in particular when applied with multiple drive frequencies – requires measure times which significantly exceed single breath holds. Therefore, reduction strategies for motion artifacts are required including breath-holds, navigators and image registration, which all were consistently applied and analyzed in this in-vivo study. Our results show that displacement of organs is smallest during breath-hold MRE while, remarkably, mean stiffness values are not significantly affected by breathing. Overall image quality is comparable between breath-hold and free-breathing MRE when the latter is corrected by 2D-image registration during post processing.

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