On the Development of a Novel Contrast Pulse Sequence for Polymer-Shelled Microbubbles

Area of Science:

• Medical Imaging
• Acoustics
• Biomedical Engineering

Background:

• Ultrasound contrast agents (UCAs) are crucial for enhancing contrast in ultrasound examinations.
• Nonlinear ultrasound imaging techniques have been developed to improve contrast between tissue and blood pools using UCAs.

Purpose of the Study:

• To introduce and evaluate a novel contrast pulse sequence (CPS4) for ultrasound imaging.
• To compare the performance of CPS4 against conventional pulse inversion (PI), subharmonic (SH), and ultraharmonic (UH) techniques.

Main Methods:

• Developed CPS4, integrating PI, SH, and UH techniques to mitigate propagation distortion.
• Applied CPS4 and conventional techniques to detect microbubbles in a tissue-mimicking flow phantom.
• Quantified contrast-to-tissue ratios (CTRs) for all tested methods.

Main Results:

• CPS4 demonstrated superior performance in detecting microbubbles compared to individual PI, SH, and UH techniques.
• The highest contrast-to-tissue ratio (CTR) of approximately 16 dB was achieved using CPS4.
• CPS4 effectively removed propagation distortion while capturing unique SH and UH responses from UCAs.

Conclusions:

• The novel CPS4 technique offers enhanced contrast-to-tissue ratios in ultrasound imaging.
• CPS4 provides a significant improvement over conventional nonlinear ultrasound imaging methods.
• This technique holds promise for improved visualization and detection of ultrasound contrast agents.