Figure 7: Time course of alterations in renal oxygenation as estimated by blood oxygen level-dependent (BOLD) MRI for the cortex and the medulla depicted as percentage changes (mean ± SEM) in from baseline (100%, dotted lines). Increase in above baseline signifies reduced (blood) oxygenation, that is, hypoxia. Intravenous injection of either saline, iopromide 300 mg I/mL, or iodixanol 320 mg I/mL was done at time 0; CM doses were 4 g I/kg of body mass. Data taken from [40].