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Titolo:
ULTRASOUND BACKSCATTER AT 30 MHZ FROM HUMAN BLOOD - INFLUENCE OF ROULEAU SIZE AFFECTED BY BLOOD MODIFICATION AND SHEAR RATE
Autore:
VANDERHEIDEN MS; DEKROON MGM; BOM N; BORST C;
Indirizzi:
UNIV UTRECHT HOSP,INST HEART LUNG,DEPT CARDIOL,ROOM G02 523,POB 85 500 3508 GA UTRECHT NETHERLANDS UNIV UTRECHT HOSP,INST HEART LUNG,DEPT CARDIOL 3508 GA UTRECHT NETHERLANDS DELFT UNIV TECHNOL,CTR TECH GEOSCI,SEISM & ACOUST LAB DELFT NETHERLANDS TNO,INST APPL PHYS 2600 AD DELFT NETHERLANDS UNIV ROTTERDAM HOSP,THORAXCTR ROTTERDAM NETHERLANDS ERASMUS UNIV ROTTERDAM ROTTERDAM NETHERLANDS INTERUNIV CARDIOL INST NETHERLANDS UTRECHT NETHERLANDS
Titolo Testata:
Ultrasound in medicine & biology
fascicolo: 6, volume: 21, anno: 1995,
pagine: 817 - 826
SICI:
0301-5629(1995)21:6<817:UBA3MF>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CELL AGGREGATION; ECHOGENICITY; INVITRO; HEMATOCRIT; SPECTRUM; TISSUES;
Keywords:
INTRAVASCULAR ULTRASOUND; BLOOD ECHOGENICITY; RED BLOOD CELL AGGREGATION; FREQUENCY DEPENDENCE; SHEAR-RATE DEPENDENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M.S. Vanderheiden et al., "ULTRASOUND BACKSCATTER AT 30 MHZ FROM HUMAN BLOOD - INFLUENCE OF ROULEAU SIZE AFFECTED BY BLOOD MODIFICATION AND SHEAR RATE", Ultrasound in medicine & biology, 21(6), 1995, pp. 817-826

Abstract

High frequency intravascular ultrasound may show a high intensity backscatter from blood which hampers the discrimination between lumen andarterial wall. In this study, the acoustic behaviour of blood at 30 MHz in relation to rouleau size was analyzed, In a Couette viscometer, high frequency (2040 MHz) backscatter data from normal and modified blood samples from eight volunteers were obtained at shear rates from 0 to 1008 s(-1). The acoustic behaviour of blood was quantified by the integrated backscatter power and the spectral slope of the backscatter coefficient, Backscatter from blood depended on rouleau size. At a shear rate of zero, both whole blood and rouleau-enhanced blood showed a 11-dB-higher integrated backscatter power than rouleau-suppressed blood, which itself was 10 dB higher than that of hemolysed blood, the latter showing a 6-dB-higher backscatter than saline, Platelets did not contribute to the backscatter power. Plasma and saline produced no detectable integrated backscatter power other than noise. The spectral slope of whole and rouleau-enhanced blood was small (1 and 0.5, respectively), whereas rouleau-suppressed blood and hemolysed blood (both with a slope of 3.3) behaved almost like a Rayleigh scattering medium (slope = 4). The backscatter from rouleau-suppressed blood showed no shear rate dependence. At low shear rates (<0.8 s(-1) for the integrated backscatter power and <0.2 s(-1) for the spectral slope), whole blood androuleau-enhanced blood tended to the results from the static situation (no shear). At high shear rates (>80 s (-1) for integrated backscatter power and >11 s(-1) for spectral slope), these samples tended to the results of rouleau-suppressed blood. Ultrasound backscatter at 30 MHz from human blood is only caused by red blood cells, With increasing aggregate( rouleau) size, the integrated backscatter power increased by 11 dB, and the spectral slope decreased from 3.3 to 1.

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Documento generato il 20/10/20 alle ore 05:12:57