Hi Cassie
those are the result of low bandwidth and susceptibility artifacts.
There's not much that can be done about them post-hoc - the images don't
contain enough information to reconstruct accurate models in those
regions. In general we recommend higher bandwidth sequences for this
reason, ideall multi-echo mprage
sorry
Bruce
On Mon, 16 Mar 2015, Cassandra Wannan wrote:
Hi guys,
I am quite new to Freesurfer and am having some issues with
hyper-intensities in the set of scans I am working on. The spots are
appearing mainly in GM in the inferior temporal lobes and the orbitofrontal
cortex, and seem to be in all of the scans I have looked at so far from my
data set (these are old 1.5T scans from the late 90's).
I don't know if there is anything to be done about the issue, but any advice
would be greatly appreciated, particularly as both of these regions are ROIs
for my study. In some areas, it doesn't look as though the hyper-intensities
have affected the wm or pail boundaries, but in others they clearly have.
Cheers,
Cassie
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