Shruthi,
the original file exists in some bizarre reference frame (e.g. it's
31487mm > 31 meters in X from the 0 point). Registration then places
your mask outside the field-of-view. In order to sort this out, we
need _much_ more information on the original file which you used to
generate the mask from and the exact steps you've done.
However - good news is that you don't actually need to sort this out,
given that it is fairly safe to assume that this won't work anyways:
the original mask has <1000 voxels in 1x1x1mm space - the original
epi resolution is 6x3x3 > 50mm^3, so you end up having <20 voxels to
do an ICA on - this is a few orders of magnitude below what you need.
cheers
christian
On 14 Dec 2005, at 17:24, Shruthi Chapkrapani wrote:
> Here is the magic number 426632.
> Files uploaded:
>
> Insula Mask:
>
> Insula.nii.gz-----------Before registration
> Insula-reg.nii.gz ---- After registration
> Insula-reg.nii.mat----After registration
>
> PNAS Mask:
>
> PNAS.nii.gz----------- Before registration
> PNAS-reg.nii.gz------ After registration
> PNAS-reg.nii.mat-----After registration
>
> Data:
>
> SMBE.nii.gz-----------Before registration
> SMBE-reg.nii.gz------After registration
> SMBE-reg.nii.mat----After registration
>
> Thanks so much!!!!
>
> Shru
>
>
>
>
>
> On Dec 14, 2005, at 11:36 AM, Christian Beckmann wrote:
>
>> Hi Shruthi,
>>
>>> Now the problem is I dont see anything in my Insula mask...
>>
>> This is probably due to re-sampling or wrong registration
>>
>>> Before I used to see white spots in the region where the right
>>> Insula is located but now I just see nothing but a black
>>> screen.The PNAS mask looks very ugly too...It looks like one big
>>> white blob on Fslview..
>>> I am not sure what went wrong..If you want I can upload the
>>> data..Do let me know
>>
>> Feel free to create a tar file with (i) all files in it and (ii)
>> all transformation matrices and send me the magic number
>> thanks
>> christian
>>
>>
|