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Abstract #0495

Investigating the potential of highly accelerated FatNavs for dynamic shimming

Frdric Gretsch 1 , Jos P Marques 2 , Rolf Gruetter 1,3 , and Daniel Gallichan 1

1 CIBM, EPFL, Lausanne, Vaud, Switzerland, 2 Dept. of Radiology, University of Lausanne, Vaud, Switzerland, 3 Depts. of Radiology, Universities of Lausanne and Geneva, Vaud, Switzerland

We recently showed that fat navigators (FatNavs) can be used for motion correction of head scans, exploiting the natural sparsity of the fat image to allow higher acceleration factors than water images. In this work we investigate the potential of using a dual-echo FatNav to also estimate dynamic changes in the B0-field due to respiration with the aim of applying the FatNavs to also allow dynamic shimming. Our initial tests indicate that the fat image is suitable for tracking respiration-induced B0 changes and can do so even at acceleration factors up to 6x9 for the FatNav.

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