Conference Proceeding

A two-pulse technique for extracting 3rd harmonic from ulasound contrast agent echo signal

Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 09/2008; DOI:10.1109/IEMBS.2008.4650439 pp.5415 - 5418 In proceeding of: Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE
Source: IEEE Xplore

ABSTRACT Multi-pulse techniques like CPS (contrast pulse sequence) and TPS (triplet pulse sequence) are the most popular methods for separating the 3rd harmonic signals from received signal. Those two methods, however, transmit a pulse at least three times along each scanline with different phase and amplitude, which results in the frame rate reduction. In this paper, we propose a technique using two pulses whose phase difference is 90° and a simple digital filter. The second harmonic signal is eliminated by summing two received signals as their phase difference becomes 180° and then the fundamental signals are eliminated by using a digital filter. Computer simulations are performed for different values of signal bandwidths and filter specifications. The results show the maximum error is −35.5dB compared to TPS.

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Keywords

3<sup>rd</sup> harmonic signals
 
Computer simulations
 
contrast pulse sequence
 
different phase
 
different values
 
digital filter
 
frame rate reduction
 
fundamental signals
 
maximum error
 
Multi-pulse techniques
 
phase difference
 
pulses
 
scanline
 
second harmonic signal
 
signal bandwidths
 
signals
 
simple digital filter
 
triplet pulse sequence
 
two methods
 

Jae-Hee Song