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Abstract #2411

Global and Spatially Varying B0 Drifts Due to Gradient System Heating

Karl-Heinz Herrmann1, Martin Krmer2, Jrgen R. Reichenbach2

1IDIR I, Medical Physics Group, Jena University Hospital , Jena, Germany; 2IDIR I, Medical Physics Group, Jena University Hospital, Jena, Germany

EPI is sensitive to B0 drifts and especially if the phase encoding direction changes as in PROPELLER EPI, images can suffer from severe blur if B0 shifts are not compensated. However, heating up the gradients during DTI or fMRI scans causes not only global drifts of B0, which are easy to compensate once known, but also spatially varying B0 changes of up to 30Hz.