Speckle in the Doppler signal - correlation of CW-Doppler signals from blood for varying transmit frequency
(2002) IEEE Ultrasonics Symposium, 2002 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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/611657
- author
- Jansson, Tomas LU ; Persson, Hans W LU and Lindström, Kjell LU
- organization
- publishing date
- 2002
- 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
- host publication
- 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
- conference location
- Munich, Germany
- conference dates
- 2002-10-08 - 2002-10-11
- 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
- 2016-04-04 11:37:02
- date last changed
- 2022-02-13 21:37:40
@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}}, 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}}, 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}}, doi = {{10.1109/ULTSYM.2002.1192581}}, year = {{2002}}, }