Estimation of mean transit times from semiquantitative indices derived from standard renograms

Statistical analysis has been used to find the best relationship between mean transit time calculated from corrected (blood-background subtracted) renograms and empirical indices measured directly from the standard renogram. The best formula of those compared for estimating mean transit time when both time-to-peak and % maximum activity at 15 min are known is Y=0.17+0.49X1+0.003X2, where Y is a dependent variable and X1 and X2 are predictor variables.