Sabbah P, Simond G, Salamon G
Department of Radiology, Laveran Hospital, Marseille, France.
Comput Med Imaging Graph. 1997 Jul-Aug;21(4):219-23. doi: 10.1016/s0895-6111(97)00016-5.
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.
