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Harmonic chirp imaging method for ultrasound contrast agent
Jerome M G Borsboom1, Chien Ting Chin, Ayache Bouakaz
1Department of Experimental Echocardiography, Thoraxcentre, Erasmus MC, Rotterdam, The Netherlands. j.borsboom@erasmusmc.nl
Summary
Chirp excitation using harmonic compression improves medical ultrasound imaging for contrast agents, enhancing signal-to-noise ratio (SNR) and penetration depth. This novel method offers better visualization of microbubbles compared to traditional pulse excitation.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Acoustic Engineering
Background:
- Coded excitation in medical ultrasound enhances signal-to-noise ratio (SNR) and penetration depth.
- Current methods often face limitations in optimizing these parameters for specific applications like contrast imaging.
Purpose of the Study:
- To propose and evaluate a chirp excitation method utilizing the second harmonic component for contrast agent imaging in ultrasound.
- To assess the performance of a harmonic compression filter designed to extract this second harmonic component.
Main Methods:
- Developed a chirp excitation method focusing on the second harmonic response of contrast agents.
- Implemented a compression filter to selectively extract the second harmonic from echo signals.
- Validated through simulations, 2-D optical observations of bubble dynamics, and B-mode imaging of a flow phantom.
Main Results:
- Chirp excitation demonstrated a significant increase in response compared to pulse excitation with equal peak amplitude.
- An approximate 10 dB increase in SNR was observed for chirp excitation.
- Axial resolution remained comparable (within 10%) to pulse excitation, with range side-lobe levels 30 dB below the main lobe in simulations and phantom studies.
Conclusions:
- The proposed chirp excitation method with harmonic compression effectively enhances SNR and maintains resolution in ultrasound contrast imaging.
- While side-lobes were visible in B-mode images, the overall performance indicates a promising advancement over conventional pulse excitation techniques.
