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Titolo:
Implementation of spectral width Doppler in pulsatile flow measurements
Autore:
Lee, BR; Chiang, HK; Chou, YH; Kuo, CD; Wang, JH; Lee, SK;
Indirizzi:
Natl Yang Ming Univ, Inst Biomed Engn, Taipei 112, Taiwan Natl Yang Ming Univ Taipei Taiwan 112 st Biomed Engn, Taipei 112, Taiwan Natl Yang Ming Univ, Vet Gen Hosp Taipei, Dept Radiol, Taipei 112, Taiwan Natl Yang Ming Univ Taipei Taiwan 112 i, Dept Radiol, Taipei 112, Taiwan Natl Yang Ming Univ, Vet Gen Hosp Taipei, Dept Resp Therapy, Taipei 112, Taiwan Natl Yang Ming Univ Taipei Taiwan 112 t Resp Therapy, Taipei 112, Taiwan Taichung Vet Gen Hosp, Dept Radiol, Taichung, Taiwan Taichung Vet Gen Hosp Taichung Taiwan sp, Dept Radiol, Taichung, Taiwan
Titolo Testata:
ULTRASOUND IN MEDICINE AND BIOLOGY
fascicolo: 8, volume: 25, anno: 1999,
pagine: 1221 - 1227
SICI:
0301-5629(199910)25:8<1221:IOSWDI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRASOUND;
Keywords:
flow velocity measurement; Doppler spectrum; beam-vector angle; spectrum averaging; annular array;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Chiang, HK Natl Yang Ming Univ, Inst Biomed Engn, 155 Sect 2,Li Numg St, Taipei 112, Taiwan Natl Yang Ming Univ 155 Sect 2,Li Numg St Taipei Taiwan 112 an
Citazione:
B.R. Lee et al., "Implementation of spectral width Doppler in pulsatile flow measurements", ULTRASOUN M, 25(8), 1999, pp. 1221-1227

Abstract

In this paper, we present an automatic beam-vector (Doppler) angle and flow velocity measurement method and implement it in pulsatile flow measurements using a clinical Doppler ultrasound system. In current clinical Doppler ultrasound flow velocity measurements, the axis of the blood vessel needs to be set manually on the B-scan image to enable the estimation of the beam-vector angle and the beam-vector angle corrected flow velocity (the actual flow velocity). In this study, an annular array transducer was used to generate a conical-shaped and symmetrically focused ultrasound beam to measure the flow velocity vectors parallel and perpendicular to the ultrasound beamaxis. The beam-vector angle and flow velocity is calculated from the mode frequency (f(d)) and the maximum Doppler frequency (f(max)) of the Doppler spectrum. We develop a spectrum normalization algorithm to enable the Doppler spectrum averaging using the spectra obtained within a single cardiac cycle. The Doppler spectrum averaging process reduces the noise level in the Doppler spectrum and also enables the calculation of the beam-vector angle and flow velocity for pulsatile flows to be measured. We have verified the measurement method in vivo over a wide range of angles, from 52 degrees to 80 degrees, and the standard deviations of the measured beam-vector angles and flow velocities in the carotid artery are lower than 2.2 degrees and 12cm/s (about 13.3%), respectively. (C) 1999 World Federation for Ultrasoundin Medicine & Biology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/20 alle ore 12:20:36