Alright, a few more things. I apologize if some of my questions may be
rudimentary, but I just recently started to become familiar with fieldmaps
and also do not have a physics/programming background.
So the suggestion has been to use the real and imaginary images and
calculate the phase from them using atan2, or whatever other method there
may be. How is this different from using the phase image produced by the
scanner?
How is atan2 used? What would y and x be? I am looking at the syntax but do
not understand it too well.
Dave, the reason you set saveinter = 1, is not necessarilly for the purpose
of saving the individual coil images, but just to get the combined coil
image in the appropriate units, correct?
If I use the real and imaginary images, do I still have to perform the
processes described in the article?
John, what is your rationale for using the fast GRE and is there anything
you do with it differently than with standard GRE? I originally thought the
fast GRE acquired multiple lines of k-space per echo, however Dave informed
me this is incorrect. Thanks for you suggestion on the masking, that makes
sense. Do you just create this mask using FSL?
Lastly, any more suggestions as to things I should be doing are greatly
appreciated. Again, I am fairly new to fieldmaps and am sort of figuring
this out on my own.
Thanks!
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