Hi Robert,
Sounds like you are on the right track.
The range of the magnitude image is unimportant.
Also, the datatype doesn't matter, so leaving it as it is
will be fine.
We simply use this image to determine a good mask
for the field map.
All the best,
Mark
On 22 Apr 2006, at 18:33, Robert Terwilliger wrote:
> Dear FSL Folks,
>
> I am learning how to use prelude and fugue with our
> Siemens Allegra 3T.
>
> We obtained one real-valued phase image and one
> real-valued magnitude image. Both were of type
> 'short'.
>
> The (real-valued) phase image ranged from 0 to ~4095.
> I converted this a 32-bit float ranging from 0 to
> 2*pi. No problem.
>
> For the magnitued image, I've read the documentation,
> but I'm still not sure how to proceed.
>
> The magnitude image ranges from 0 to ~2000 (short
> int). Do I need to convert to 32-bit float and rescale
> this image, and if so, how should it be rescaled?
>
> Regards,
>
> Robert Terwilliger
> University of Pittsburgh.
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