Sorry if this is a very basic question; I was hoping for
some clarification on a point that seems to have
been mentioned elsewhere on this listserv. Regarding “actual” b-values
calculated from the trace of the full b-matrix – the values for the “B0” images
technically have some non-zero b-value corresponding to the diffusion weighting
imparted by the imaging gradients. It seems that someone has already asked a
similar question about the opposite case (i.e. whether the actual or “ideal”
b-values should be used for the high b-value cases)… I was wondering about the
B0 case: Is it more accurate/appropriate to use the actual computed b-values
for the “B0”/”reference”/”non-diffusion-weighted” images or is it more correct
to flag the non-diffusion weighted volumes with b-values of “0.00”? Moreover,
how would this affect, in particular, the registration/eddy current correction
and the tensor calculation if the actual b-values were used versus if the
b-values for the “reference” images were artificially assigned to be 0? Thank
you, so much in advance.
Sincerely,
Dharshan
--
Dharshan
Chandramohan
Post-Baccalaureate
IRTA
Clinical
Brain Disorders Branch
Genes,
Cognition, and Psychosis Program
NIMH,
NIH
10
Center Dr, Rm. 3C205
Bethesda,
MD 20892
phone:
(301) 496-9274
email:
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