Here is what you want to do to get the gray matter volumes for the
regions you are interested in.
1. Create a mask of the region you are interested in using the WFU
PickAtlas Tool.
2. Segment and spatially normalize the gray matter of your subjects.
3. Use spm_mask to mask the modulated, spatially normalized gray
matter volumes using the mask from step 1.
4. Use getSegmentVolume on the result of 3 to find the area of the
gray matter you are interested in.
Does anyone else have any suggestions or can think of why this might
be a bad idea?
Ray
PS: The gray matter volume numbers might be very susceptible to your
spatial normalization error. You might want to smooth the mask to
give it a little margin?
On Apr 21, 2006, at 5:14 PM, Akemi Tomoda wrote:
> Hi SPM ML,
>
> I'm working on VBM using SPM2. I'd like to calculate localized GMV
> such as
> left and right Frontal Lobe. I use getSegmentVolume.m to get whole
> brain GMV
> and would like something similar for localized regions to clarify
> laterality. Is using a region mask before pre-processing the only
> way or is
> there a script to parse out GMV after pre-processing that does not
> involve
> VOI?
>
> Akemi Tomoda
>
> Developmental Biopsychiatry Research Program
> McLean Hospital
> [log in to unmask]
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