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Abstract #1405

Estimation of the Eddy-Current Induced Magnetic Field from Affine-Transformation Parameters and Its Relevance for the Comparability of DTI Data

Siawoosh Mohammadi1, Harld Mller2, Harald Kugel3, Dirk Mller2, Michael Deppe1

1Department of Neurology, University of Muenster, Mnster, NRW, Germany; 2Magnetic Resonance Unit, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Sachsen, Germany; 3Department of Clinical Radiology, University of Muenster, Mnster, NRM, Germany

The eddy current distortions and motion artifacts vary strongly between DTI data depending on the type of MR scanner and on the MR parameters. Although parts of these artifacts can retrospectively be corrected, residual EC artifacts remain and reduce the comparability of DTI data. In this study we present a method to estimate the EC induced magnetic field (EC field) from affine transformation parameters that were used for EC and motion correction. We further reconstructed parts of the long-term time course of EC field and demonstrated that this can be used to assess the comparability of DTI data.