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European Radiology Experimental
Fig. 3 | European Radiology Experimental

Fig. 3

From: Computation of contrast-enhanced perfusion using only two CT scan phases: a proof-of-concept study on abdominal organs

Fig. 3

A Scatterplot and linear regression of the relationship between ratio of perfusions and peak enhancement ratios. Three points for each patient are included: empty squares for kidney/pancreas data, empty triangles for kidney/hepatocellular carcinoma (HCC) data, and black upside-down triangles for pancreas/HCC data. Regression equation: \(\mathrm{enhancement\;ratio}=0.75+0.39\times \left(\mathrm{perfusion\;ratio}\right)\), r2 = 0.55, p < 0.001. Perfusion data refer to the perfusions computed as maximal upslope of the time-enhancement curve obtained using all data points smoothed with the spline function. B Bland–Altman plot for the comparison between enhancement and perfusion ratios, showing a -0.68 bias (red line), with green lines indicating the lower (-2.34) and upper (1.01) limit of agreement

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