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

## TL;DR

This review explores recent methods to improve the lateral resolution in acoustic imaging, offering insights into future research directions.

## Contribution

The paper systematically summarizes and compares novel techniques for achieving super-resolution in acoustic imaging.

## Key findings

- Traditional and modern methods like metamaterial lenses and deep learning are reviewed for enhancing resolution.
- The paper highlights the advantages and limitations of each approach for improved acoustic imaging.
- It provides clear recommendations for future research in high-resolution acoustic imaging.

## Abstract

Acoustic imaging, especially ultrasound, underpins a wide range of applications from non-destructive evaluation to medical and materials analysis, yet its performance is ultimately constrained by lateral resolution. This review systematically summarizes recent advances in overcoming diffraction-limited resolution, encompassing traditional focusing techniques, transducer optimization, physical metamaterial lenses, and methods based on algorithmic optimization and deep learning technologies. It comprehensively covers approaches for enhancing acoustic lateral resolution, compares the differences and respective advantages and disadvantages of various methods, and proposes clear directions and recommendations for future research. This work provides robust guidance for subsequent research trends and development opportunities in higher-resolution acoustic imaging.