Figure 2.

Example of region of interest selection in the portal vein and Qontrast^®-assisted contrast-enhanced ultrasound analysis of portal vein parameters in healthy control. A: Region of interest (ROI) drawn in a region of the portal vein (PV) in a selected set of higher signal intensity frames 1 min and 10 s after SonoVue^® injection; B: A gamma variate (bolus)-corrected parametric curve for the translational movement caused by breathing activity. SI (%): Signal intensity; PEAK (%): Maximum signal intensity reached during SonoVue^® bolus injection; TTP (s): Time to peak; RBV (cm³): Regional blood volume; RBF (cm³/s): Regional blood flow; MTT (s): Mean transit time.