Hello guys,
I am curious as to how white matter hypointensities (on T1 mprage) are measured
automatically for the aseg.stats file in FS? A group at UCSF is interested in
using this measure for a study and would like to have a nice explanation or
citation to describe how it is generated.
I
matter changes.
Thank you for directing me to Koen Van Leemput. Take care,
-Victor
-Original Message-
From: Bruce Fischl [mailto:fis...@nmr.mgh.harvard.edu]
Sent: Wednesday, May 12, 2010 5:06 PM
To: Laluz, Victor
Cc: Nick Schmansky; freesurfer@nmr.mgh.harvard.edu; Koen Van Leemput
Subject
Hello Freesurfer-ers,
I tried to look up a reference for the delineation of the insula label in the
standard parcellation and came up empty. Does anyone have a published article,
or some form of citation that explains how Freesurfer defines the insula? This
is in reference to the insula label
Hello Freesurfer folks,
I hope this question is simple to answer: Is there any way to do a
surface-based group analysis, a-la qdec, without the limitation of 2 continuous
variables?
My goal is to analyze a thickness relationship with continuous variable X,
which I have so far analyzed
To: Laluz, Victor
Cc: Bruce Fischl; freesurfer@nmr.mgh.harvard.edu
Subject: Re: Replicating qdec analysis with more than 2 continuous variables
you have a couple options:
1) assuming you are using 64b linux, you can download a new version of
qdec which supports selecting 'nuisance' variables in the design
Hello,
Throughout most of Freesurfer's version history, I have noticed this problem
pop up every 50 or so cases I do:
I will have a pretty well-processed surface but with some inaccuracies in the
WM surface, I will put control points down to correct it, and reprocess with
autorecon2-cp as
Hello,
I'm interested in subdividing some of the standard atlas regions into anterior
and posterior divisions. Besides creating individual labels for each of the
labels, is it possible to create a generic anterior label for multiple
subregions (encompassing an entire lobe at a time), then
Hello,
Not sure if this bug has been mentioned before, but there is a bug with
using aparcstats2table for the aparc.a2005s parcellation map. If some of
the subjects in the group have missing values of a certain type,
aparcstats2table fails to designate a 0 for them. So for instance, it's
often
The body of my email was lost because of the attachments: here it is
again for those who are curious. Sorry about that, I didn't know a text
file attachment would do that.
Not sure if this bug has been mentioned before, but there is a bug with
using aparcstats2table for the aparc.a2005s
Hello everyone,
I have many scans taken just under 10 years ago on a 1.5T Siemens
scanner. For some reason, the images from this time period have
consistent problems with gray matter / white matter contrast;
consistently, Freesurfer measures almost all cerebral brain tissue as
being white. I
PROTECTED]
Sent: Monday, October 20, 2008 2:30 PM
To: Laluz, Victor
Cc: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Recurring issue with poor gray/white
distinction - easy fix?
Hi Victor,
have you tried messing with the segmentation parameters to mri_segment
and mris_make_surfaces
Hello,
Occasionally I run into a problem with lower quality, noisy T1 images
(1.5mmx1mmx1mm) where almost all of the tissue is classified as white
matter. Upon inspecting these images (attached), I can understand why it
would make this mistake; the white-gray matter border in them is very
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