Yes, that is correct. (The SBRef for the BOLD scans are gradient-echo images).
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Michael Harms, Ph.D.
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Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry,
Thank you for the clarification!
A quick follow up question. Do you know of any systematic comparison of:
1) standard fieldmap (two pairs of phase and magnitude images)
2) fieldmap derived from a pair of spin echo images with opposite phase
encoding directions
3) fieldmap derived from a pair of
1 and 2 performed similarly when we compared them. 3 is not a good idea, as
GRE images have signal dropout that is asymmetric and will mess up the
registration that underlies the reversed phase encoding direction method.
Matt.
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