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Titolo:
Flow imaging with pulsed Doppler ultrasound and flow phantoms
Autore:
Tortoli, P; Thompson, RS; Berti, P; Guidi, F;
Indirizzi:
Univ Florence, Dept Elect Engn, I-50139 Florence, Italy Univ Florence Florence Italy I-50139 Elect Engn, I-50139 Florence, Italy Univ Sydney, Sch Math & Stat, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 & Stat, Sydney, NSW 2006, Australia
Titolo Testata:
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
fascicolo: 6, volume: 46, anno: 1999,
pagine: 1591 - 1596
SICI:
0885-3010(199911)46:6<1591:FIWPDU>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
STEADY FLOW; REFRACTION; ARTIFACTS;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Tortoli, P Univ Florence, Dept Elect Engn, I-50139 Florence, Italy Univ Florence Florence Italy I-50139 I-50139 Florence, Italy
Citazione:
P. Tortoli et al., "Flow imaging with pulsed Doppler ultrasound and flow phantoms", IEEE ULTRAS, 46(6), 1999, pp. 1591-1596

Abstract

The use of a multigate profiling system with steady laminar flow in plastic tubes revealed spectral artifacts not previously described. In particular, a double or split profile was often observed. In this paper, these artifacts are related to the dual mode ultrasound propagation in the plastic tube. The propagation speeds and, therefore, refraction angles and propagation paths are different for the longitudinal and the shear wave. The power transmission can be extraordinarily sensitive to small variations in the angle of incidence, and this may combine with the existence of a range of angles of incidence within any focused ultrasound beam to produce spectral distortions. The plastic tube is thus shown equivalent to a selective filter, which diminishes some frequency components in the Doppler spectrum relative to others. The spectral artifacts are explained in terms of the relative powertransmitted by each mode, and the degree of beam defocusing experienced byeach. Spectral distortions persist even when the beam-to-flow orientation is well away from the critical angle. The results of this study show that it is feasible to understand the acoustic transmission behavior of a flow phantom, based on a knowledge of the material properties, and to demonstrate the usefulness of doing so.

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Documento generato il 30/09/20 alle ore 05:53:19