Results 191 to 200 of about 14,398 (231)

Peak Systolic Velocity, Resistance Index and Pulsatility Index

Acta Radiologica, 1997
Purpose: To study variation in the process of measuring Doppler ultrasound (US) wave forms. Material and Methods: Eleven radiologists measured peak systolic velocity (PSV), resistance index (RI), and pulsatility index (PI) from a pre-recorded videotape. The wave forms were taken from the carotid, brachiàl, celiac, and renal interlobar
Raija Mikkonen, J. M. Kreula, P. J. Virkkunen   +2 more
openaire   +3 more sources

Real-time calculation of ultrasonic pulsatility index

Medical & Biological Engineering & Computing, 1981
One of the disadvantages of indices derived from ultrasonic Doppler signals is that they are not normally available instantaneously. In an attempt to overcome this problem, a real-time spectrum analyser has been interfaced to an Intel 8085 microprocessor system and programmed to calculate pulsatility index in real time.
D T, Gibbons, D H, Evans, W W, Barrie, P S, Cosgriff   +3 more
openaire   +2 more sources

Limitation of pulsatility index as a diagnostic tool in the newborn

Critical Care Medicine, 1983
Pulsatile flow in the anterior cerebral arteries was studied and pulsatility index (PI) calculated by 3 observers in 10 newborn infants in order to establish the reproducibility of a noninvasive Doppler technique. No significant differences were noted among the observers and the estimated error of observation was 0.073. Subsequently, 14 healthy preterm
P J, Hancock, R N, Goldberg, E, Bancalari, M C, Hill, T, Castillo   +4 more
openaire   +2 more sources

Hemodynamic and arteriographic evaluation of femoral pulsatility index

Journal of Surgical Research, 1982
Femoral pulsatility index (FPI), a function derived from the Doppler arterial velocity spectrum which is independent of Doppler probe/vessel angle, has previously been reported to be inversely proportional to the angiographically determined degree of aortoiliac stenosis.
D P, Flanigan, J T, Collins, J A, Schwartz, C, O'Mara, W R, Flinn, J J, Bergan, J S, Yao   +6 more
openaire   +2 more sources

Some failings of pulsatility index and damping factor

Ultrasound in Medicine & Biology, 1986
Pulsatility index (PI) is a commonly used method of objective assessment of the Doppler waveform. PI falls with increasing proximal stenosis and is raised by increasing peripheral resistance. Damping factor (DF) for an arterial segment is calculated by dividing the proximal by the distal PI.
Baker, AR, Evans, DH, Prytherch, DR, Morton, DB, Bentley, S, Asher, MJ, Bell, PRF   +6 more
openaire   +2 more sources

Arterial Pulsatility Index values for prediction of aneurysm

2015 Medical Technologies National Conference (TIPTEKNO), 2015
Blood flow is pulsatile and and the pulsatility is essential to maintain vessel wall function. Pulsatility Index is measures of vascular resistance. Phase contrast technique is used to determine blood flow quantification in cerebrovascular and cardiovascular pathologies.
Tekin, Engin, Pehlivan, Murat
openaire   +2 more sources

Pulsatility Index, Patent Ductus Arteriosus, and Brain Damage

Pediatrics, 1982
The study of CBF velocity by external Doppler method appears to offer the clinician a noninvasive tool with which to gather information related to changes in cerebral hemodynamics. Inasmuch as the clinical condition of sick preemature infants is different from that of adults with obstructive vascular disease, and as the arteries under study are deeper ...
R, Bejar, T A, Merritt, R W, Coen, F, Mannino, L, Gluck   +4 more
openaire   +2 more sources

Increased Pulsatility Index Is Associated with Intracranial Arterial Calcification

European Neurology, 2012
<b><i>Background/Aims:</i></b> An increase in the pulsatility index (PI) has been suggested to reflect distal vascular resistance. The purpose of the present study was to investigate the association between intracranial arterial calcification and intracranial PIs.
Kwang-Yeol, Park, Pil-Wook, Chung, Yong Bum, Kim, Heui-Soo, Moon, Bum-Chun, Suh, Won Tae, Yoon   +5 more
openaire   +2 more sources

Transcranial Doppler Pulsatility Index: What it is and What it Isn’t

Neurocritical Care, 2012
Transcranial Doppler (TCD) pulsatility index (PI) has traditionally been interpreted as a descriptor of distal cerebrovascular resistance (CVR). We sought to evaluate the relationship between PI and CVR in situations, where CVR increases (mild hypocapnia) and decreases (plateau waves of intracranial pressure-ICP).Recordings from patients with head ...
de Riva, Nicolás, Budohoski, Karol P, Smielewski, Peter, Kasprowicz, Magdalena, Zweifel, Christian, Steiner, Luzius A, Reinhard, Matthias, Fábregas, Neus, Pickard, John D., Czosnyka, Marek   +9 more
openaire   +3 more sources

Femoral pulsatility index in the evaluation of aortoiliac occlusive disease

Journal of Surgical Research, 1981
Abstract Accurate, noninvasive, hemodynamic assessment of atherosclerosis involving the aortoiliac segment remains a frontier in vascular surgery. Femoral pulsatility index, a vessel/probe angle independent function derived from the common femoral artery sonogram, was evaluated by comparison to the invasive hemodynamic parameters of pressure and flow
D P, Flanigan, J T, Collins, J J, Goodreau, S J, Burnham, J S, Yao   +4 more
openaire   +2 more sources