Tried it but again not working. Is it possible that something may still be
wrong?
--
Andres Roman
> From: Mark Jenkinson <[log in to unmask]>
> Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
> Date: Fri, 5 Aug 2011 15:57:19 +0100
> To: <[log in to unmask]>
> Subject: Re: [FSL] ROI sphere problems
>
> Hi,
>
> This has been reported before.
> It isn't a problem with the spherical convolution it is just very, very
> tiny inaccuracies in the FFT implementation for larger spheres.
> You only see the problem if you follow it with "-bin" in fslmaths.
> If you instead follow it with "-thr 1e-10 -bin" then it should work fine.
>
> All the best,
> Mark
>
>
> On 5 Aug 2011, at 15:41, Andres Roman wrote:
>
>> Hi FSL crew,
>>
>> I am trying to create a ROI sphere in the DLPFC of 10mm but it seems to
>> crash everytime I do it.
>>
>> I used the following comands to create a point first,
>>
>> fslmaths MNI152_T1_2mm_brain_mask -roi 128 1 162 1 100 1 0 1 mask -odt float
>>
>> This works perfect. But then when I try to expand this to a 10mm sphere I
>> get a very weird result (which I attach as a pic from fslview). I used the
>> following command to expand it:
>>
>> fslmaths mask.nii.gz -kernel sphere 10 -fmean -bin spheremask_10mm -odt
>> float
>>
>> After this I used a smaller size of sphere (4mm) and it worked fine as you
>> can see in the other pic I attach. I was wondering why this could happen.
>> Thank you once more for your help.
>>
>> Best wishes
>>
>> --
>> Andres Roman
>> <10mm ROI sphere.gif>
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