Fig. 3
From: Optimisation of ultrasound liver perfusion through a digital reference object and analysis tool
Registration of the time-intensity curve. When the contrast has not reached the field of view of the transducer, the signal intensity is at baseline. Once the contrast in the vessels reaches the region being scanned, the transducer receives reflected waves caused by microbubbles and an increase in the signal is observed. As the contrast disappears, the signal intensity diminishes