"Follow-up" method for processing of brain function MR images.
FMRI with standard 1.5 T scanners requires adapted algorithms because the time course of intensity signal showed a non-linearity of the baseline. The protocol contains sequential images covering periods of rest followed periods of stimulation. The images of each period of rest and stimulation were averaged, offering a series of averaged images. From this series, we conserved only the pixels which presented the alternated variations corresponding to the temporal pattern of the paradigm. A colour scale was used to present the average percentage of variations of each pixel selected. We have performed activation paradigms with a classical motor protocol. This simple "follow-up" method appears effective for the identification of activated areas.
Sabbah
P
P
Department of Radiology, Laveran Hospital, Marseille, France. sabbherv@mail.pf
Simond
G
G
Salamon
G
G
D000465:Algorithms; D001921:Brain / Q000033:anatomy & histology* / Q000502:physiology; D002540:Cerebral Cortex / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging; D009043:Motor Activity / Q000502:physiology; D010812:Physical Stimulation; D012146:Rest; D013997:Time Factors