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
Dept of Anatomy and Neuroscience, The
University of Melbourne, The University of Melbourne,
The Florey Institute of Neuroscience and Mental Health,
Melbourne, VIC, Australia,
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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