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Abstract #1608

Retrospective Motion Correction of T2* Maps Improves Interpretability of Brain Pathologies

Ulrike Nth 1 , Steffen Volz 1 , Elke Hattingen 2 , and Ralf Deichmann 1

1 Brain Imaging Center (BIC), Goethe University Frankfurt/Main, Frankfurt/Main, Germany, 2 Institute of Neuroradiology, University Hospital Frankfurt/Main, Frankfurt/Main, Germany

A method for reducing motion artefacts in quantitative T2* maps is presented, based on repeated acquisitions with reduced spatial resolution. Raw data are averaged with weighting factors individually chosen for each k-space line, so the influence of corrupted lines is strongly reduced. A study performed on healthy subjects performing pre-trained motion shows that corrupted lines are reliably detected and suppressed. In a study on tumour patients, pathological details visible in a T2-weighted reference image are replicated in the motion corrected T2* map, whereas the uncorrected T2* map yields artefacts that can easily be misinterpreted as additional lesions.

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