Ah. So then it's still most accurate to use the .vtk files for the
volumes.
Thanks!
Allison Nugent
MRI Physicist
SNMAD/MIB/NIMH/NIH
Office: (301)451-8863
Mobile: (301)408-8560
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-----Original Message-----
From: Brian Patenaude [mailto:[log in to unmask]]
Sent: Wednesday, June 04, 2008 8:42 AM
To: Nugent, Allison C. (NIH/NIMH) [E]
Cc: [log in to unmask]
Subject: Re: FIRST and calculating volumes
From the boundary corrected .nii image, yes. However, this may no be so
if
you extract the label from the first time point of the 4D volume output
by FIRST. This is because if there is overlap between stuctures, the
labels will add. Also, despite that the voxels
may overlap, the surfaces may not.
Cheers,
Brian
On Wed, 4 Jun 2008, Allison Nugent wrote:
> I think so - so if I extract the volumes of the ROI's from the .nii
image
> (which I think would be easier than setting up a dummy design matrix,
etc),
> those will be boundary corrected, and reflect accurate volumes?
>
> Thanks!!
>
> Allison
>
> On Tue, 3 Jun 2008 13:52:32 +0100, Brian Patenaude
<[log in to unmask]> wrote:
>
>> Hi,
>>
>> The individual structures images (found in the 4D output file). The
>> boundary correction is a discrete, volumetric process that results is
>> used in the conversion between surface (.vtk) to volumetric images
>> (.nii.gz).
>>
>> Does that clear thing up ?
>>
>> Cheers,
>>
>> Brian
>
>
>
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