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hi, seems like a basic question but for some reason i cant find the answer on faq's or message board. how does FEAT deal with scanner drift in the signal (i.e. due to thermal fluctuations etc.). there is no baseline models to specify etc. if there exist non-linear drifts in teh data that i want to remove, would you suggest adding them as explicit EV's? thanks vitaly -- |`~~~~~~~~~~~~~\|/~~~~~~~~~~~~~'| Vitaly Napadow, Ph.D., Lic.Ac. Dept. of Radiology Massachusetts General Hospital CNY 149-2301, 13th St. Charlestown, MA 02129 phone: (617) 724-3402 fax: (617) 726-7422 email: [log in to unmask] |`~~~~~~~~~~~~~/|\~~~~~~~~~~~~~'|