Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Nonlinear native propagation effects of diagnostic ultrasound computed andmeasured in blood
Autore:
Filipczynski, L; Wojcik, J; Kujawska, T; Lypacewicz, G; Tymkiewicz, R; Zienkiewicz, B;
Indirizzi:
Polish Acad Sci, Inst Fundamental Technol Res, Dept Ultrasound, Warsaw, Poland Polish Acad Sci Warsaw Poland hnol Res, Dept Ultrasound, Warsaw, Poland
Titolo Testata:
ULTRASOUND IN MEDICINE AND BIOLOGY
fascicolo: 2, volume: 27, anno: 2001,
pagine: 251 - 257
SICI:
0301-5629(200102)27:2<251:NNPEOD>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
TISSUE;
Keywords:
ultrasound; pulses; nonlinear propagation; blood; cardiology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Filipczynski, L PAN, IPPT, Swietokrzyska 21, PL-00049 Warsaw, Poland PAN Swietokrzyska 21 Warsaw Poland PL-00049 arsaw, Poland
Citazione:
L. Filipczynski et al., "Nonlinear native propagation effects of diagnostic ultrasound computed andmeasured in blood", ULTRASOUN M, 27(2), 2001, pp. 251-257

Abstract

Nonlinear propagation effects produced by focused pulses in blood were measured over a 20-cm range, being inspired by diagnostic applications in cardiology. The initial and maximum pressures applied during measurements in blood were equal to 0.40 MPapp and 0.76 MPapp, while the pressure estimated at the patient body surface equalled 0.70 MPapp. Measurements of the frequency characteristic and the linearity of the ultrasonic probe used in experiments were performed in water. A numerical procedure developed previously was applied in blood to calculate the pressure distribution of its first and second harmonics along the beam axis. The comparison of numerical and measured distributions in blood at a temperature of 37 degreesC showed rather good agreement. Using numerical methods, a proportional growth of the second harmonic with the increased applied initial pressure was first observed, and finally the maximum limiting effect was found. In this way, much higher level of harmonics could be obtained. However, there arise the questions of the transmitting system construction and of the nonuniform resolution in the case of harmonic imaging when increasing the applied initial pressure. (C) 2001 World Federation for Ultrasound in Medicine & Biology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 15:14:55