Hemodynamic imaging with pulsatility-index and resistive-index color Doppler US.

Abstract

Pulsatility index and resistive index were mapped with color Doppler ultrasound (US) and compared with spectral Doppler US findings. In the carotid arteries and/or kidneys in 12 healthy subjects, the pulsatility index and resistive index were estimated from mean frequency shifts and mapped into "cool-warm" or "rainbow" color scales. Surveys that depicted intervessel variations in a complex vascular field were useful in deciding where to perform spectral Doppler US. Intravessel variations were consistent with fluid dynamic theory.

Treatment effect with anti-RAGE F(ab′)2 antibody improves hind limb angiogenesis and blood flow in Type 1 diabetic mice with left femoral artery ligation

“…19 While this index is currently used mostly in obstetrics and neurology (transcranial Doppler), application in vascular disease and PAD have been reported, as well as for flow assessment though vein grafts to coronary arteries intraoperatively. [25][26][27] Compared to laser Doppler which assesses tissue perfusion, the pulsatility index more closely indicates blood flow in arterial vascular collaterals.…”

Evaluation of extracranial carotid artery duplex ultrasound scanning parameters in cerebral ischemic or nonischemic patients without significant cervical carotid artery stenosis

“…14 PI is often examined in renal arteries as a marker of peripheral vascular resistance. 14,15 PI for cerebral circulation has been examined for the cervical internal CA 15,17 and the middle and posterior cerebral arteries with transcranial Doppler ultrasonography. 5 PI of the cervical internal CA reflects the microangiopathic changes of cerebral vessels for patients with diabetes mellitus, 17 but the use of PI as a marker of peripheral vascular resistance has not been well established in cerebral circulation.…”

12B-2 Functional Doppler Imaging: A Feasibility Study

“…2D mapping of flow indices using mean velocity waveforms estimated using autocorrelation has been proposed previously [2] [3]. Our method of using the filtered power offers several distinct advantages.…”

“…However, it is possible to derive angle-independent quantitative estimates of hemodynamic function, such as RI and AT, from an ensemble of received Doppler echoes and map them onto a 2D image [2] [3]. Our method of 2D flow index mapping (2D-FIM), utilizes the power Doppler signal, which has high sensitivity for detecting small blood vessels and slow flow.…”