You need to merge your data from different diffusion directions into
a single 4D nifti file - you can use fslmerge to do this.
T
On 15 Oct 2007, at 09:52, Patrick Hales wrote:
> Hi
>
> This is the first time I have tried using FSL, and I am trying to
> get the DTIFit program to work. I have
> a series of diffusion weighted images, each of which are stored as
> individual fid files (created using
> Varian's VnmrJ software). There are seven images in total, one with
> b=0 and 6 with diffusion
> gradients applied in non co-linear directions. I have converted
> each of these into Nifti format, and
> stored them all in a directory. I used FSLview to create my binary
> mask, and have created text files
> with my gradient directions (all normalized to unit length), and my
> b-values (in units of s/mm2). In
> the DTIFit program, I have selected 'specify input files manually',
> and supplied it with the directory
> containing my nifti files, and the filenames of my gradients and b-
> values text files.
>
> When I press 'go', I get a number of error messages, such as:
> 'ERROR: nifti_image_read(....directory
> name....)can't open header file', 'ERROR: nifti_image_open(...):bad
> header info', 'Error: failed to open
> file', etc. I get the same errors when I try it with analyze files.
>
> Would you be able to tell me what I'm doing wrong? Thanks very much
>
> Patrick Hales
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