Dear Daniela,
As I explained in my previous email, it is possible to get
this to work without a magnitude image but it is *much*
harder as you need to create a well registered magnitude
image to your phase image. This is possible using your
T1 structural but will generally involved you making a mask
from both images and then registering the masks, and then
applying this registration to the T1 image. As it is very typical
for the scanner to save a magnitude image during the fieldmap
sequence, I would first suggest that you check with your scanner
operator to make sure that you really do not have such a
magnitude image, or cannot get it, before proceeding to do the
registration with the T1 structural.
Sorry that this is probably not the easy answer you were
hoping for, but it really is worth checking first as all the
scanner sequences for fieldmaps that I am aware of do
save the magnitude image along with the phase.
All the best,
Mark
On 20 Oct 2010, at 09:21, Daniela Gebauer wrote:
> Dear FSL-experts,
>
> Is it possible to make a fieldmap for FEAT with only phase images -
> like in SPM?
> Unfortunately, I havenīt got a magnitude image.
>
> Kind regards, Daniela
>
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