I didn't see a bvals file attached, but there are a bunch of zeros
after your initials, are those the bvals?? That wouldn't be correct.
What did you use to reconstruct your images? You may need to change
the appropriate b-values because some software will output zeros
instead of reading it from the dicoms. For example, if your first
volume was b=0 and all the others were taken at b=1000, you may have
a bvals file with 65 zeros, which you would need to change to a zero
followed by "1000" sixty-four times.
That's the first thing I would check. Then look at your bvecs file.
It should be three rows of 65 columns.
Running bedpostx_datacheck will probably help you find where your
problem is.
Hope this helps!
ted
On Apr 9, 2008, at 11:47 PM, Adil Javed wrote:
> Hi,
> I just acquired DTI images from our GE scanner, using
> 64 directions. I am able to convert the file in to
> *.nii.gz. But when I run DTIFIT in FSL, specifying
> each of the files manually including bvec.txt and
> bval.txt, the resulting images (all of them) have no
> intensity value and screen looks blank. The min and
> max intensity is zero. The data.nii.gz file looks
> fine in FSL view and has b0 to b64 vectors, all with
> images. Not sure what's going on? I even set the min
> intensity to 0 and max to 1, 0.1, etc. with no luck.
> My bval.txt file is attached. I think there is
> something wrong with that file. Also, my FA file is
> attached.
>
> Many thanks for your help.
>
> AJ0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> <dti_FA.nii.gz>
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