Fig. 5.

(a) Magnitude of RI change versus postmortem age of the tissue. (b) Magnitude of RI change versus scan speed. Linear regression analysis revealed a significant inverse correlation between RI change and scan speed ($p=0.0092$), whereas for postmortem time, the correlation with RI change was not significant ($p=0.3416$ for cat, and $p=0.2275$ for human). $R^2$ values for each regression line are indicated in the graphs.