Saurabh Shah1, Peter Kellman2, Andreas Greiser3, Peter J. Weale1, Sven Zuehlsdorff1, Renate Jerecic1
1Siemens Medical Solutions USA, Inc., Chicago, IL, USA; 2National Institutes of Health, Bethesda, MD, USA; 3Siemens AG Healthcare Sector, Erlangen, Germany
Accurate field map estimation is the first step towards an improved cardiac shimming. Field map estimation in the heart is challenging due to the presence of cardiac and respiratory motion, and blood flow effects. In this study, the effects of cardiac and respiratory motion on field map acquisition were investigated using multi-echo GRE sequence. High resolution field maps acquired at different cardiac phases were analyzed to study the effects of cardiac motion. Different field map acquisition schemes were compared to derive a rapid non-ECG triggered method with parallel imaging support, which provides volumetric coverage around the heart in 5-6 seconds.