FIGURE 4.
Value of VT and identifiability as function of duration of image acquisition using either 300 (A) or 120 (B) min as terminal points. VT was calculated for temporal cortex (●) and thalamus (○) using unconstrained 2-tissue-compartment model. Scans were analyzed using brain data from time 0 to specified time on x-axis. VT was expressed as percentage of terminal value. That is, terminal value of VT calculated from either entire 300 min of scanning (A) or only initial 120 min (B). Values of normalized VT are shown with circles for temporal cortex (●) and thalamus (○) and use y-axis on left. Corresponding values of identifiability are shown with squares (■, □) and use y-axis on right.