Hello,
This paper is very relevant to this issue:
Sanfilipo MP, Benedict RH, Zivadinov R, Bakshi R (2004) Correction for intracranial volume in analysis of whole brain atrophy in multiple sclerosis: the proportion vs. residual method. Neuroimage 22:1732–1743.
Anthony
On 6/10/16 9:34 AM, Bruce Fischl wrote:
yes, but you would expect uninteresting variance with head/intracranial vault size, which is why you would include it as a regressor
On Fri, 10 Jun 2016, Marja Caverlé wrote:
Hi Bruce,
No, I expect cerebellar volume to vary with diagnosis, but I want to account
for the head size differences. This seemed to me the way to do that, but of
course I am not an expert.
Best,
Marja
On Fri, Jun 10, 2016 at 11:23 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu>
wrote:
if you expect cerebellar volume to vary in an uninteresting way
with head size (which I think you probably do)
On Fri, 10 Jun 2016, Marja Caverlé wrote:
Ok Thanks! Just to be sure, the eTIV would also make
the cerebellar numbers
more informative right?
Best,
Marja
On Fri, Jun 10, 2016 at 11:14 PM, Bruce Fischl
<fischl@nmr.mgh.harvard.edu>
wrote:
Hi Marja
yes, you can just use those volumes, and no,
including it as a
regressor isn't the same as dividing by eTIV
(although you can
do that instead).
cheers
Bruce
On Fri, 10 Jun 2016, Marja Caverlé wrote:
Ok thanks Bruce.
If I want to use these cerebellar white
matter
volumes, I assume I also need
to use the eTIV as regressor right?
(just like for
the cerebral volumes?
And maybe a stupid question, but can I
use the eTIV
as regressor by just
dividing the structure volume by the
eTIV?
Best,
Marja
On Fri, Jun 10, 2016 at 10:56 PM, Bruce
Fischl
<fischl@nmr.mgh.harvard.edu>
wrote:
Hi Marja
we do whole cerebellum white
matter and gray
matter, but things
like lobules aren't released yet.
cheers
Bruce
On Fri, 10 Jun 2016, Marja Caverlé
wrote:
Hi all,
I am hoping to find some
cerebellar
volumes, but I
don't know how to get
them.
I already did recon -all on
all my
subjects, but I
cannot find any of these
numbers in the .stats files.
Am I just
missing them,
or does the recon all
not do any cerebellar stuff?
Best,
Marja
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