Abstract #4251

High temporal resolution retrospective motion and $$$B_0$$$ correction using FIDNavs and segmented FatNavs at 7T.

Frédéric Gretsch¹, Tobias Kober^2,3,4, Maryna Waszak^2,3,4, José P. Marques⁵, and Daniel Gallichan¹

¹CIBM, EPFL, Lausanne, Switzerland, ²Advanced Clinical Imaging Technology (HC CMEA SUI DI BM PI), Siemens Healthcare AG, Lausanne, Switzerland, ³Department of Radiology, University Hospital (CHUV), Lausanne, Switzerland, ⁴LTS5, EPFL, Lausanne, Switzerland, ⁵Donders Centre for Cognitive Neuroimaging, Radboud University, Netherlands

FID navigators (FIDNavs) and a few lines of highly accelerated double-echo 3D fat navigators (FatNavs) were measured each TR of a high-resolution 3D-GRE acquisition. High temporal resolution $$$B_0$$$ variations and motion parameters could be estimated by the FIDNavs using the lower temporal resolution FatNavs to derive calibration data. The cardiac cycle pattern emerged clearly in these estimates and retrospectively corrected images were of clearly improved quality, thereby demonstrating the potential for this hybrid approach.

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