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Speckle in the Doppler signal - correlation of CW-Doppler signals from blood for varying transmit frequency

Jansson, Tomas LU ; Persson, Hans W LU and Lindström, Kjell LU (2002) IEEE Ultrasonics Symposium, 2002 In 2002 IEEE Ultrasonics Symposium. Proceedings (Cat. No.02CH37388) p.1499-1502
Abstract
Speckle is an unwanted noise in ultrasound images, and appears as returning echoes are coherently summed over the transducer surface. In Doppler applications, the total power of the received spectrum varies in a manner similar to speckle. This paper investigates the correlation of continuous-wave (CW) Doppler signals obtained from simultaneously transmitted carrier frequencies, when a slowly flowing blood stream is insonated. The covariance function of received Doppler power versus transmitted frequency is shown to agree well to a theoretical modelled function, as well as experiments made on static, independent scatterers, even though the present measurements have a larger variability. The speckle to noise ratio of the Doppler signal... (More)
Speckle is an unwanted noise in ultrasound images, and appears as returning echoes are coherently summed over the transducer surface. In Doppler applications, the total power of the received spectrum varies in a manner similar to speckle. This paper investigates the correlation of continuous-wave (CW) Doppler signals obtained from simultaneously transmitted carrier frequencies, when a slowly flowing blood stream is insonated. The covariance function of received Doppler power versus transmitted frequency is shown to agree well to a theoretical modelled function, as well as experiments made on static, independent scatterers, even though the present measurements have a larger variability. The speckle to noise ratio of the Doppler signal amplitude was found to be 1.87 (S.E. 0.04), compared to the theoretical number 1.91 valid for pulse-echo imaging. It was also found that average of spectral estimates from independent channels reduce the variability of such estimates (Less)
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
static independent scatterers, received Doppler power, covariance function, slowly flowing blood stream, simultaneously transmitted carrier frequencies, continuous-wave Doppler signal correlation, received spectrum total power, transducer surface, returning echoes, ultrasound images, unwanted noise, varying transmit frequency, blood, Doppler signal speckle, CW-Doppler signals, speckle to noise ratio, variability, Doppler signal amplitude, pulse-echo imaging, spectral estimates, independent channels, blood perfsion measurements
in
2002 IEEE Ultrasonics Symposium. Proceedings (Cat. No.02CH37388)
pages
1499 - 1502
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE Ultrasonics Symposium, 2002
external identifiers
  • wos:000182111700340
  • scopus:0036992736
ISBN
0-7803-7582-3
DOI
10.1109/ULTSYM.2002.1192581
language
English
LU publication?
yes
id
91de78ee-b88b-4676-b8a2-f3cc513387a9 (old id 611657)
date added to LUP
2007-11-27 15:33:43
date last changed
2017-01-01 08:04:17
@inproceedings{91de78ee-b88b-4676-b8a2-f3cc513387a9,
  abstract     = {Speckle is an unwanted noise in ultrasound images, and appears as returning echoes are coherently summed over the transducer surface. In Doppler applications, the total power of the received spectrum varies in a manner similar to speckle. This paper investigates the correlation of continuous-wave (CW) Doppler signals obtained from simultaneously transmitted carrier frequencies, when a slowly flowing blood stream is insonated. The covariance function of received Doppler power versus transmitted frequency is shown to agree well to a theoretical modelled function, as well as experiments made on static, independent scatterers, even though the present measurements have a larger variability. The speckle to noise ratio of the Doppler signal amplitude was found to be 1.87 (S.E. 0.04), compared to the theoretical number 1.91 valid for pulse-echo imaging. It was also found that average of spectral estimates from independent channels reduce the variability of such estimates},
  author       = {Jansson, Tomas and Persson, Hans W and Lindström, Kjell},
  booktitle    = {2002 IEEE Ultrasonics Symposium. Proceedings (Cat. No.02CH37388)},
  isbn         = {0-7803-7582-3},
  keyword      = {static independent scatterers,received Doppler power,covariance function,slowly flowing blood stream,simultaneously transmitted carrier frequencies,continuous-wave Doppler signal correlation,received spectrum total power,transducer surface,returning echoes,ultrasound images,unwanted noise,varying transmit frequency,blood,Doppler signal speckle,CW-Doppler signals,speckle to noise ratio,variability,Doppler signal amplitude,pulse-echo imaging,spectral estimates,independent channels,blood perfsion measurements},
  language     = {eng},
  pages        = {1499--1502},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  title        = {Speckle in the Doppler signal - correlation of CW-Doppler signals from blood for varying transmit frequency},
  url          = {http://dx.doi.org/10.1109/ULTSYM.2002.1192581},
  year         = {2002},
}