Time to Peak  (in seconds) parametric map for the liver  , case YL.
Vein network shows varying arrival times.  There seem to be a substantial delay between the main Portal Vein (where we sample VIF) and the peripheral (?) branches (which actually supply the tissue).
Delays seem to be upto 15 seconds.

Liver DCDI:  Based on the discussion with Dr. Rusinek, experimenting with the alternative ways to calculate the Arterial fraction and then substitute it into the Sourbron's equation for fitting.  Reminds me of "Segmented fit" in IVIM promoted by Eric Sigmund.