Golay pulse encoding for microbubble contrast imaging in ultrasound

Area of Science:

• Ultrasound Imaging
• Medical Physics
• Biomedical Engineering

Background:

• Microbubble contrast agents significantly enhance ultrasound imaging.
• Improving contrast-to-tissue ratio (CTR) is crucial for diagnostic accuracy.
• Existing ultrasound sequences have limitations in signal enhancement.

Purpose of the Study:

• To introduce and evaluate a novel technique for microbubble contrast agent imaging.
• To enhance the contrast-to-tissue ratio (CTR) in ultrasound imaging.
• To improve the visualization of microbubble contrast agents.

Main Methods:

• Golay phase encoding, pulse inversion, and amplitude modulation (GPIAM) technique developed.
• Nonlinear pulse compression algorithm employed for signal processing.
• Comparison with conventional pulse-inversion amplitude-modulation sequences.

Main Results:

• A 6.5-dB improvement in CTR was achieved using an 8-chip GPIAM sequence.
• GPIAM enhances the time-bandwidth product of insonating waveforms.
• Microbubble response was phase encoded and compressed, enhancing contrast signal.

Conclusions:

• GPIAM technique effectively enhances microbubble contrast imaging.
• The method improves CTR while maintaining resolution and suppressing tissue signal.
• Trade-off between CTR improvement and reduced frame rate noted.