"Hepatic arterial resistive index is most often assessed during the evaluation of a liver transplant. In this setting, a low RI is usually more specific for disease than a high RI (the opposite situation from a renal transplant) 5."
"type I: RI >0.80 with continuous blood flow in the diastolic phase"
"type II: RI = 1, complete absence of the diastolic signal and preserved systolic velocity"
"type III: absence of diastolic signal and diminished systolic velocity"
"type IV: undetectable Doppler flow"
"Low RI: more specific for disease in a liver transplant, a low RI may result from:"
"High RI: less specific for disease in a liver transplant, a high RI may result from:"