Title :
Coded excitation for harmonics imaging
Author_Institution :
GE-Yokogawa Med. Syst. Ltd., Hino, Japan
Abstract :
For harmonics imaging, coded and chirped low level excitations are investigated in order not to break the microballoon contrast agent, and not to cause spectrum leakage via nonlinear propagation distortion of the transmission pulse. A half frequency square-root amplitude apodized signal is proposed to match to the harmonic domain matched filter after the second harmonic process by the microballoon agent. The cases and causes when this doesn´t work are also discussed
Keywords :
Golay codes; acoustic signal processing; biomedical ultrasonics; chirp modulation; harmonic generation; matched filters; medical image processing; Golay code phase modulation; acoustic pressure; chirped low level excitation; coded excitation; echography; half frequency square-root amplitude apodized signal; harmonic domain matched filter; harmonics imaging; microballoon contrast agent; nonlinear propagation distortion; second harmonic process; spectrum leakage; transmission pulse; Biomedical imaging; Chirp modulation; Clouds; Electric breakdown; Frequency; Harmonic distortion; Matched filters; Phase modulation; Power harmonic filters; Signal processing;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584314
