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Fig 1. The regions of interest (ROI) for an arterial input (ACA) and venous output (sagittal sinus) (A) and for gray matter and white matter (B). The corresponding time-concentration curves are presented in C, in which curve 1 indicates the artery and curve, 2 the vein, and in D, in which curve 3 indicates gray matter and curve 4, white matter.
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