Fig. 1
From: Contrast-enhanced ultrasound of both kidneys in healthy, non-anaesthetized cats
Schematic time intensity curve of a feline kidney. Peak intensity (PI) measured in decibel (dB) was defined as the highest intensity value minus baseline intensity (BI) before the initial rise. Wash-in slope (WIS) was calculated with the data 10 % above baseline up to 85 % of the peak value using a linear regression. Wash-out slope (WOS) included less data after the peak value (85–40 % of peak intensity value) in order to avoid the exponentially decaying tail. Mean transit time (MTT) was defined as the time from the initial rise until a 50 % decrease of peak intensity [30]