Purpose
To evaluate potential modeling paradigms and the impact of relaxation time effects on human blood‐brain barrier (BBB) water exchange measurements using FEXI (BBB‐FEXI), and to quantify the accuracy, precision, and repeatability of BBB‐FEXI exchange rate estimates at 3
.
Methods
Three modeling paradigms were evaluated: (i) the apparent exchange rate (AXR) model; (ii) a two‐compartment...