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Mark, Thanks, I'll give it a try on Tueaday, tomorrow is a holiday over here. Dolf _______________________ Adolf Pfefferbaum,MD Neuroscience Program SRI International 650-859-2927 phone 650-859-2743 FAX On Mon, 2 Sep 2002, Mark Jenkinson wrote: > Hi, > > The bias field from FAST includes any factor that alters the > constancy of tissue intensity. Hence there are other terms apart > from the B1 bias field and these can have higher spatial frequencies. > However, there is also a smoothness constraint for the bias field which > can be increased if all you are interested in is the large scale (B1) > effects. Use the -l option with a large number (say 500) and you will > get higher smoothing. > > All the best, > Mark > > > Adolf Pfefferbaum wrote: > > The bias field from FAST seems to have a higher spatial frequency than > > that from N3. N3 produces a field that looks primarily like B1. The one > > from FAST seems to have some anatomic detail. Can the bias field > > correction in FAST be turned of so I could compare FAST with N3 to FAST > > with its bias correction? > > > > Thanks, > > > > Dolf > > > > _______________________ > > Adolf Pfefferbaum,MD > > Neuroscience Program > > SRI International > > 650-859-2927 phone > > 650-859-2743 FAX >