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Titolo:
SPECTRAL VELOCITY PROFILES FOR DETAILED ULTRASOUND FLOW-ANALYSIS
Autore:
TORTOLI P; GUIDI F; GUIDI G; ATZENI C;
Indirizzi:
UNIV FLORENCE,DEPT ELECTR ENGN I-50139 FLORENCE ITALY
Titolo Testata:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control
fascicolo: 4, volume: 43, anno: 1996,
pagine: 654 - 659
SICI:
0885-3010(1996)43:4<654:SVPFDU>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOPPLER ULTRASOUND; FREQUENCY; SIGNALS; METER; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
P. Tortoli et al., "SPECTRAL VELOCITY PROFILES FOR DETAILED ULTRASOUND FLOW-ANALYSIS", IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 43(4), 1996, pp. 654-659

Abstract

The operation of a novel ultrasound multigate instrument capable of computing in real-time the fast Fourier transform (FFT) of Doppler signals detected from 64 equally spaced range cells is presented. The new system provides up to 50 velocity profiles per second, which are displayed in such a manner that information about the full spectral contentof Doppler signals at all the investigated depths is continuously monitored over a PRE-wide frequency range which can be set arbitrarily between -PRF and +PRF. Experimental results are presented, which demonstrate that the true velocity profile can be accurately detected throughthe computation of ''local'' maximum velocities obtained by properly correcting the maximum frequency of each spectrum. There is also a discussion on how the results of multigate analysis are influenced by thesample volume length, a parameter which can be usually set by modifying the duration of the transmitted burst. In particular, it is shown that, in regions close to the vessel walls, the shear rate can be measured with a spatial resolution related to the spacing between subsequent range cells and not to the sample volume length.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 02:40:02