Enhanced Lateral Resolution in Acoustic Imaging: From High- to Super-Resolution

Area of Science:

• Acoustics and Wave Physics
• Materials Science
• Biomedical Imaging

Background:

• Acoustic imaging, including ultrasound, is vital for non-destructive evaluation, medical diagnostics, and materials analysis.
• The performance of acoustic imaging is fundamentally limited by diffraction, specifically its lateral resolution.
• Enhancing lateral resolution is critical for advancing the capabilities and applications of acoustic imaging technologies.

Purpose of the Study:

• To systematically review and summarize recent advancements in overcoming diffraction-limited lateral resolution in acoustic imaging.
• To provide a comprehensive overview of various techniques for improving acoustic lateral resolution.
• To compare the advantages and disadvantages of different resolution enhancement methods and suggest future research directions.

Main Methods:

• Review of traditional focusing techniques and transducer optimization.
• Exploration of physical metamaterial lenses for acoustic wave manipulation.
• Analysis of algorithmic optimization and deep learning-based approaches for resolution enhancement.

Main Results:

• Identification of diverse strategies to surpass the diffraction limit in acoustic imaging.
• Comparative analysis of the efficacy, benefits, and drawbacks of each method.
• Synthesis of current research trends and emerging opportunities in high-resolution acoustic imaging.

Conclusions:

• Significant progress has been made in enhancing acoustic lateral resolution through various innovative techniques.
• A comparative understanding of these methods is essential for selecting optimal approaches for specific applications.
• Future research should focus on integrating and advancing these techniques to unlock new frontiers in acoustic imaging.