Medical ultrasonography It is used in ultrasound testing of umbilical artery for placental insufficiency. RI should not exceed 0.60 at 30 weeks of gestation. RI is also commonly used to monitor kidney status, especially following kidney transplant. Following kidney transplantation, patients with an RI > 0.8 have an increased mortality. Medical laser Doppler imaging Mapping of the local<unk>  from laser Doppler imaging enables unambiguous identification of retinal arteries and veins on the basis of their systole-diastole variations, and reveal ocular hemodynamics in human eyes.
Arterial resistivity index
Arterial input function
Coronary flow reserve
Pressure reactivity index
Vascular resistance
PAH clearance
Arteriovenous oxygen difference
Coronary perfusion pressure