ould be that the
> WM segmentation fails somewhere. Anyway, the longitudinal stream should
> help fix these things.
>
> Are these mprages or multi echo mprages? 3T? what coil?
>
> Best, Martin
>
> On Wed, 2011-07-27 at 18:01 -0700, Jessica Liu wrote:
> > Hi Bruce,
> &g
ischl wrote:
> how are you computing the 20% difference? We definitely don't see this, and
> Martin has done extensive testing of repeatability.
> Bruce
>
>
> On Wed, 27 Jul 2011, Jessica Liu wrote:
>
> Hi Martin,
>>
>> Thanks for getting back to me. Act
And
> the hippo label? Are there motion artifacts in the image etc.
>
> Anyway, you should process this with the longitudinal stream:
> http://freesurfer.net/fswiki/LongitudinalProcessing
> which should increase repeatability.
>
> Best, Martin
>
>
> On Wed, 2011-07-27 a
Hi,
We found 20% differences in temporal lobe brain volume and ca. 5% difference
in the hippocampus volume between two data sets of a young normal volunteer
scanned 2 days apart.
We use the one-step 19 hours recon-all -all procedure and directly sum
select values taken from the lh.aparc.stats, rh
Hi all,
I'm trying to analyze longitudinal data with for a subject with six time
points. However, when I try to create a within-subject template using all
six time points, I get the following error message on TP 3:
Resolution: 0
Iteration(single-prec): 1MRIalloc(256, 256, 256): could not alloca
Hi all,
I know that freesurfer recommends an isotropic voxel size, but I found that
a voxel size of 1.2x1.2x1.6 at 1.5T actually gives a better resolution for
my data. Would the different voxel size significantly affect the outcome of
the volumetric segmentation? Thanks!
Jessica
___
Alright, thanks for all of your input!
Jessica
2011/6/24 Bruce Fischl
> Hi Jessica
>
> yes, probably. With so many differences (sequence, field strength, coil) it
> will be really hard to get anything out of a combined dataset.
>
> sorry
> Bruce
>
> On Fri, 24
er student, do you recommend that I should concentrate on
analyzing the 3T data only, and hopefully all of the subjects can be
rescanned on the 3T? Thanks!
Jessica Liu
2011/6/23 Bruce Fischl
> Hi Jessica,
>
> the 1.5t scan looks kind of washed out and low contrast, but of course it&#x
n the left hippocampus
volume and a 18% increase for the right hippocampus based on the values in
aseg.stats. Can anyone please comment on this and explain the large
discrepancies? Thanks!
Jessica Liu
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