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FIGURE 7. Patlak graphical analysis of 18F-FHBG pulmonary kinetics in rat whose compartmental modeling fits are presented in Figure 6A. Animal was infected with Ad-CMV-mNLS-HSV1sr39tk-egfp. •, Early experimental data points on which assumption of curve linearity assumed by model is not satisfied. 
, Experimental data points on which linear regression analysis was performed. Slope (Ki), intercept, and coefficient of determination (R2) of straight line fit are displayed. Ki = Patlak influx constant.
