Journal article
Stationary echo canceling in velocity estimation by time-domain cross-correlation
The application of stationary echo canceling to ultrasonic estimation of blood velocities using time-domain cross-correlation is investigated. Expressions are derived that show the influence from the echo canceler on the signals that enter the cross-correlation estimator. It is demonstrated that the filtration results in a velocity-dependent degradation of the signal-to-noise ratio.
An analytic expression is given for the degradation for a realistic pulse. The probability of correct detection at low signal-to-noise ratios is influenced by signal-to-noise ratio, transducer bandwidth, center frequency, number of samples in the range gate, and number of A-lines employed in the estimation.
Quantitative results calculated by a simple simulation program are given for the variation in probability from these parameters. An index reflecting the reliability of the estimate at hand can be calculated from the actual cross-correlation estimate by a simple formula and used in rejecting poor estimates or in displaying the reliability of the velocity estimated
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 1993 |
| Pages: | 471-477 |
| ISSN: | 1558254x and 02780062 |
| Types: | Journal article |
| DOI: | 10.1109/42.241874 |
| ORCIDs: | Jensen, Jørgen Arendt |
A-lines Bandwidth Blood Degradation Frequency estimation Probability Pulse measurements Signal to noise ratio Time domain analysis Transducers Ultrasonic imaging biomedical measurement biomedical ultrasonics echo suppression filtration haemodynamics probability variation signal-to-noise ratio simulation program stationary echo canceling time-domain cross-correlation transducer bandwidth ultrasonic blood velocity estimation ultrasonic velocity measurement velocity-dependent degradation
