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Abstract #3069

Direct and Independent Estimation of B0 Components Based on Raw EPI Data

Frederik Testud1, Iulius Dragonu1, Jrgen Hennig1, Maxim Zaitsev1

1Medical Physics, Department of Diagnostic Radiology, University Hospital Freiburg, Freiburg, Germany

GE EPI is a widely used imaging technique, but is very sensitive to B0 field inhomogeneities. To correct for temporal changes of B0, real-time measuring methods are necessary, such as estimating gradient maps of B0 from raw EPI data. Here a filter scheme is presented to calculate local B0 gradients. The local gradient in the readout direction is estimated independently from the gradient in the phase encoding direction by finding the contour lines of the gradients. This method is compared with previously introduced raw data based techniques and shown to perform better or equally well.