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Titolo:
Assessment of arterial stenosis in a flow model with power Doppler angiography: Accuracy and observations on blood echogenicity
Autore:
Cloutier, G; Qin, Z; Garcia, D; Soulez, G; Oliva, V; Durand, LG;
Indirizzi:
Univ Montreal, Inst Rech Clin Montreal, Biomed Engn Lab, Montreal, PQ H2W 1R7, Canada Univ Montreal Montreal PQ Canada H2W 1R7 ab, Montreal, PQ H2W 1R7, Canada Univ Montreal, Ctr Hosp, Res Ctr, Lab Biorheol & Med Ultrason, Montreal, PQ, Canada Univ Montreal Montreal PQ Canada ol & Med Ultrason, Montreal, PQ, Canada Univ Montreal, Ctr Hosp, Dept Radiol, Montreal, PQ, Canada Univ Montreal Montreal PQ Canada Hosp, Dept Radiol, Montreal, PQ, Canada
Titolo Testata:
ULTRASOUND IN MEDICINE AND BIOLOGY
fascicolo: 9, volume: 26, anno: 2000,
pagine: 1489 - 1501
SICI:
0301-5629(200011)26:9<1489:AOASIA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOWER-LIMB ARTERIES; IN-VITRO; ULTRASOUND; AGGREGATION; DISEASE; SONOGRAPHY; PHANTOM; LEVEL; US;
Keywords:
peripheral arterial disease; lower limb arteries; arterial stenosis; power Doppler ultrasound; blood echogenicity; computational fluid dynamics; 3-D reconstruction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Cloutier, G Univ Montreal, Inst Rech Clin Montreal, Biomed Engn Lab, 110 Ave Pins Ouest, Montreal, PQ H2W 1R7, Canada Univ Montreal 110 Ave Pins Ouest Montreal PQ Canada H2W 1R7 da
Citazione:
G. Cloutier et al., "Assessment of arterial stenosis in a flow model with power Doppler angiography: Accuracy and observations on blood echogenicity", ULTRASOUN M, 26(9), 2000, pp. 1489-1501

Abstract

The objective of the project was to study the influence of various hemodynamic and theologic factors on the accuracy of 3-D power Doppler angiography(PDA) for quantifying the percentage of area reduction of a stenotic artery along its longitudinal axis. The study was performed with a 3-D power Doppler ultrasound (US) imaging system and an is vitro mock flow model containing a simulated artery with a stenosis of 80% area reduction. Measurements were performed under steady and pulsatile how conditions by circulating, atdifferent flow rates, four types of fluid (porcine whole blood, porcine whole blood with a US contrast agent, porcine blood cell suspension and pol cine blood cell suspension with a US contrast agent). A total of 120 measurements were performed. Computational simulations of the fluid dynamics in the vicinity of the axisymmetrical stenosis were performed with finite-element modeling (FEM) to locate and identify the PDA signal loss due to the wallfilter of the US instrument. The performance of three segmentation algorithms used to delineate the vessel lumen on the PDA images was assessed and compared. It is shown that the type of fluid flowing in the phantom affects the echoicity of PDA images and the accuracy of the segmentation algorithms. The type of flow (steady or pulsatile) and the flow rate ran also influence the PDA image accuracy, whereas the use of US contrast agent has no significant effect. For the conditions that would correspond to a US scan of a common femoral artery (whole blood flowing at a mean pulsatile dow rate of 450 mL min(-1)), the errors in the percentages of area reduction were 4.3 +/- 1.2% before the stenosis, -2.0 +/- 1.0% in the stenosis, 11.5 +/- 3.1% in the recirculation zone, and 2.8 +/-. 1.7% after the stenosis, respectively. Based on the simulated blood flow patterns obtained with FEM, the lower accuracy in the recirculation zone can be attributed to the effect of the wall filter that removes low flow velocities In conclusion, the small errorsreported in vitro may support the clinical use of this technique. (C) 2001World Federation for Ultrasound in Medicine & Biology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:55:09