Fig. 4
Correlation between the semi-quantitative ratio analysis and the reference tissue model MRTM2. The coefficient of determination (R2) between the BPND values obtained from the MRTM2 and the values obtained from the semi-quantitative analysis was determined. The values correspond to the five experiments for five ROIs over representative regions of high (raphe nuclei and thalamus), intermediate (basal ganglia and frontal cortex) and low (occipital cortex) radioactivity concentration. Except for the raphe nuclei (in the sagittal plane), the mean values of the right and left sides were taken for the four other regions. BPND = binding potential of the nondisplaceable compartment