Applied automatic Image Derived Input Function segmenter to the Liver Eovist dataset.
Here is example for the aorta. As usual user just have to put the Macroseed around the artery.
The rest is automatic.  Default parameters from PET function worked, just vessel diameter was set for 10 mm.
Size of resulting ROI is 2500 voxel,  17.5 cm3.  ROI is guaranteed to be a tube in the prevalent Z direction.  Tube is continuous - an Interruption on the sagittal view is just due to the tube being curved.