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Titolo:
Doppler spectra from contrast agents crossing an ultrasound field
Autore:
Tortoli, P; Pratesi, M; Michelassi, V;
Indirizzi:
Univ Florence, Dept Elect Engn, I-50121 Florence, Italy Univ Florence Florence Italy I-50121 Elect Engn, I-50121 Florence, Italy Univ Roma Tre, Dipartimento Ingn Meccan & Ind, Rome, Italy Univ Roma Tre Rome Italy e, Dipartimento Ingn Meccan & Ind, Rome, Italy
Titolo Testata:
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
fascicolo: 3, volume: 47, anno: 2000,
pagine: 716 - 726
SICI:
0885-3010(200005)47:3<716:DSFCAC>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHIFT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Tortoli, P Univ Florence, Dept Elect Engn, I-50121 Florence, Italy Univ Florence Florence Italy I-50121 I-50121 Florence, Italy
Citazione:
P. Tortoli et al., "Doppler spectra from contrast agents crossing an ultrasound field", IEEE ULTRAS, 47(3), 2000, pp. 716-726

Abstract

When contrast agents are injected in a fluid, it is implicitly assumed that they move at the same velocity as the fluid itself. However, a series of in vitro tests performed by using air-filled microbubbles suspended in distilled water, have shown that the Doppler spectrum generated in this case may be notably different from that obtained from non-resonating scatterers. In this paper, we show, through a simple simulation model, that the actual movement of microbubbles may be predicted as the result of the complex balance between two forces: the ultrasound radiation force, which tends to move the particles along the sound beam direction, and the fluid drag force, which tends to move the particles along the fluid stream. The contrast agents turn out to be displaced only during the passage of the ultrasound burst; during the remaining time, they are maintained at the fluid velocity by the drag force. Based on the total particle displacement estimated between consecutive pulses, a series of Doppler spectra corresponding to different intensity levels was computed. This series was shown to be in excellent agreement with the experimental spectra obtained in vitro using Levovist(R) (Schering AG, Berlin, Germany) particles suspended in distilled water Rowing at asteady rate.

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Documento generato il 29/09/20 alle ore 18:52:52