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Abstract #1731

Artefact removal in high phase gradient regions in susceptibility weighted images.

Amanda Ching Lih Ng 1 , Shawna Farquharson 2 , Sonal Josan 3 , and Roger J Ordidge 1

1 Dept of Anatomy and Neuroscience, The University of Melbourne, The University of Melbourne, VIC, Australia, 2 Imaging, The Florey Institute of Neuroscience and Mental Health, Melbourne, VIC, Australia, 3 Siemens Healthcare, Melbourne, VIC, Australia

SWI processing traditionally involves homodyne filtering of the raw complex image data to simultaneously unwrap and high pass filter the phase. In regions where there are high phase gradients, homodyne filtering may inadequately unwrap and filter the phase, resulting in substantial artefacts that appear hypo-intense on the SWI image. Such artefacts can lead to problems in the assessment of important vascular structures located in or near these regions of high phase gradients, e.g. in brain regions surrounding the sinuses. Here we demonstrate that combining a post-processing technique that reduces the high phase gradient artefacts present in SWI images.

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