“…Ziel/Aim Image-derived measurements of the dynamic arterial blood concentration (arterial input function, AIF) for pharmacokinetic modeling (PKM) are challenging for both PET and MRI in mice. Alternatively, an extracorporeal circulation approach can be used 1 . We evaluated the quantitative precision of extracorporeally measured AIFs of MRI contrast agent (CA) and its radioactive analog by dual recordings and compared dispersion effects in two different vascular access ways.…”