On 6/28/07, Jiansong Xu <[log in to unmask]> wrote:

Thanks.

> From: Matt <[log in to unmask]>
> Organization: ma-tea.com
> Reply-To: FSL - FMRIB's Software Library < [log in to unmask]>
> Date: Thu, 28 Jun 2007 08:28:26 -0400
> To: <[log in to unmask]>
> Subject: Re: [FSL] volume of gray matter within a ROI
>
> Because you want to exclude values above and below 2. In reality, the only
> other values in the hard segmentation file will be 0 for empty space, 1 for
> CSF, and 3 for white matter. I don't actually remember if avwstats++ uses
> an inclusive or exclusive threshold, so if using upper and lower values of 2
> doesn't work, you could use 1.9 and 2.1 for the same effect.
>
> Peace,
>
> Matt.
> -----Original Message-----
> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
> Of Jiansong Xu
> Sent: Wednesday, June 27, 2007 5:53 PM
> To: [log in to unmask]
> Subject: Re: [FSL] volume of gray matter within a ROI
>
> Thanks. Why both lower and upper threshold are 2?
>
>
>> From: Matt < [log in to unmask]>
>> Organization: ma-tea.com
>> Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
>> Date: Tue, 26 Jun 2007 20:03:33 -0400
>> To: <[log in to unmask]>
>> Subject: Re: [FSL] volume of gray matter within a ROI
>>
>> You could:
>>
>> A) Segment a structural scan on which you drew the ROI into grey matter,
>> white matter, and CSF using FAST.
>> B) Use avwstats++ <hard segmentation output> -l 2 -u 2 -k <your ROI> -V to
>> find the volume of grey matter (value is 2 from the segmentation) masked
> by
>> your ROI.
>>
>> Peace,
>>
>> Matt.
>> -----Original Message-----
>> From: FSL - FMRIB's Software Library [mailto: [log in to unmask]] On Behalf
>> Of Jiansong Xu
>> Sent: Tuesday, June 26, 2007 7:25 PM
>> To: [log in to unmask]
>> Subject: [FSL] volume of gray matter within a ROI
>>
>> Dear Friend:
>>
>> I have defined a ROI and want to measure the volume of gray matter within
>> this ROI. What is the procedure?
>>
>> Thanks a lot.
>>
>> Jiansong