A reference agent model for DCE MRI can be used to quantify the relative vascular permeability of two MRI contrast agents.

Cárdenas-Rodríguez J, Howison CM, Matsunaga TO, Pagel MD. "A reference agent model for DCE MRI can be used to quantify the relative vascular permeability of two MRI contrast agents." Magn Reson Imaging. 2013;31(6):900-10.