Hi,
thanks.
Yes, the problem was bvals were many zeros; the images
were acquired at b1000. For some reason the bvals
were all zeros 64 times. When I changed the values to
0 and then 1000 x 64, it worked.
Many thanks.
AJ
--- Ted Yanagihara <[log in to unmask]> wrote:
> 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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