The hepatic artery (HA) input is required in the dual-input, two-compartment model of studying liver function with dynamic gadoxetate-enhanced MRI. The dynamic contrast agent concentration in abdominal aorta (AA) is usually measured and used as the arterial input function instead of that measured in the HA because its small size. In this study, we determined the relationship between these two concentrations. We found that the measured arterial input function in AA can be reliably used as the HA input function with a suppression scaling factor taken into account.
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