The effects of prefiltering and the choice of time delay es- timators and statistical data reduction techniques on the precision of speed-of-sound estimation were investigated using the beam-tracking technique. It was found that prefiltering the data with an ideal 50-kHz low-pass filter improved the precision of the estimation in all cases. Echo cross-correlation had an advantage over peak detection for low signal-to-noise ratio (SNR) levels, but its advantage diminished as the signal-to-noise level improved due to filtering. The linear regression method was superior to the paired-point analysis technique under all conditions. Using the optimal set of parameters, precision on the order of 0.1 percent was achieved in a tissue-mimicking phantom when one beam was tracked along 75 mm in 1-mm increments.
|Original language||English (US)|
|Number of pages||9|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|State||Published - Jan 1989|
ASJC Scopus subject areas
- Acoustics and Ultrasonics
- Electrical and Electronic Engineering