Dear Experts,
Sorry if this is a repost, but I was not sure it got posted.
I have a few subjects that I want to salvage and use where there appears to
be significant signal inhomogeniety in the last few frontal slices (see
T1.mgz in attached figure 1). Despite the use of control points (placed
w
Hi Mahinda,
sorry, I meant to respond to this. It's hard to tell from the image - is
there actually data in the frontal regions? What is the source of the
drop-off? Is it a slab selective acquisition and is anterior/posterior the
slab direction?
cheers
Bruce
On Mon, 23 Jan 2012, Mahinda Yo
Hi,
No problem - thanks for coming back to me.
Imaging was carried out with a GE Excite II 3-T scanner using an eight-
channel phased array coil. We acquired coronal 3D-T1 weighted fast spoiled
gradient echo (FSPGR) (0.94 × 0.94 × 1.1 mm) which is what I am plugging
into Freesurfer.
There is act
hmmm, could also be a low sensitivity region if the region around the eyes
doesn't have coil coverage. I would try putting a line of control points in
the white matter going from anterior and moving posteriorly until the
drop-off is not that big (i.e. until the T1.mgz has voxels==110 in the
whi
Hi Bruce and Freesurfer Experts,
I tried the suggestions below in these images but without complete
resolution of the problem - there is an improvement but there is still
stuff missing right at the front (last 3 to 4 slices). Is there anything
else I can try in order to salvage these images ? As
Dear Freesurfer Experts,
Would it be easier to upload a typical example of the data I am trying to
salvage, in order to get some hints on how I might proceed with this
problem of loss of frontal signal drop off ?
Thanks in advance.
Mahinda
On Thu, Feb 23, 2012 at 2:06 AM, Mahinda Yogarajah wro
Hi Mahinda,
I can take a look if you want to upload a dataset. Please find
the instructions to upload in this wiki.
http://surfer.nmr.mgh.harvard.edu/fswiki/FtpFileExchange
Thanks,
Sita.
On Sat, 25 Feb 2012, Mahinda Yogarajah wrote:
Dear Freesurfer Experts,
Would it be easier to upload
