Contrast-enhanced ultrasound imaging with chirps: Signal processing and pulse compression
Harput, S., McLaughlan, J., Cowell, D. and Freear, S. (2015). Contrast-enhanced ultrasound imaging with chirps: Signal processing and pulse compression. 2015 IEEE International Ultrasonics Symposium (IUS). Taipei, Taiwan 21 Oct - 24 Nov 2015 doi:10.1109/ULTSYM.2015.0160
|Authors||Harput, S., McLaughlan, J., Cowell, D. and Freear, S.|
Contrast-enhanced ultrasound imaging creates one of the worst case scenarios for pulse compression due to depth and frequency dependent attenuation, high level of harmonic generation, phase variations due to resonance behavior of microbubbles, and increased broadband noise by microbubble destruction. This study investigates the feasibility of pulse compression with a matched filter in the existence of microbubbles with resonant behavior. Simulations and experimental measurements showed that the scattered pressure from a microbubble population excited by a chirp waveform preserves its chirp rate even for harmonic frequencies. Although, pulse compression by a matched filter was possible due to the conservation of the chirp rate, an increase on sidelobe levels were observed at fundamental and second harmonic frequencies. Therefore, using chirp excitation and a matched filter pair will increase the contrast-to-tissue ratio with a trade-off of decreased image quality.
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|Keywords||Microbubbles; chirp coded excitation; linear frequency modulation; pulse compression; matched filter|
|Digital Object Identifier (DOI)||doi:10.1109/ULTSYM.2015.0160|
|Accepted author manuscript|
File Access Level
|21 Oct 2015|
|Publication process dates|
|Accepted||21 Sep 2015|
|Deposited||12 Nov 2019|
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