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A flexible annular-array imaging platform for micro-ultrasound.

Weibao Qiu¹, Yanyan Yu, Hamid Reza Chabok

¹Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 5, 2013

Summary

This study introduces a new micro-ultrasound imaging platform using annular-array technology. It offers high-resolution, real-time imaging with improved depth-of-field, balancing performance and cost for various applications.

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Area of Science:

Biomedical Engineering
Ultrasound Imaging Technology

Background:

Micro-ultrasound requires high resolution (tens of micrometers) for clinical and preclinical use.
Existing micro-ultrasound systems include single-element and linear-array types, each with trade-offs in cost and image quality.
Annular-array systems offer a balance between image quality and expense.

Purpose of the Study:

To develop a novel, programmable, and real-time annular-array imaging platform for micro-ultrasound.
To enhance imaging capabilities with multi-channel dynamic beamforming for large depth-of-field.
To achieve high-speed image processing and data transfer for real-time acquisition.

Main Methods:

Development of a compact and cost-effective printed circuit board (PCB) based platform.
Implementation of advanced field-programmable gate array (FPGA) technology for image processing algorithms.
Utilizing multi-channel dynamic beamforming and high-speed data transfer interfaces.

Main Results:

The platform demonstrated good performance in hardware, algorithm, and phantom tests.
Achieved a contrast-to-noise ratio (CNR) > 1.2 within a 3.8 to 8.7 mm imaging depth range.
Supported real-time image acquisition at over 25 frames per second with a 2.5-fold depth-of-field improvement over single-element systems.

Conclusions:

The developed annular-array micro-ultrasound platform provides a viable alternative to existing systems.
It enables high-resolution, real-time imaging with extended depth-of-field and cost-effectiveness.
The platform shows promise for advanced preclinical and clinical micro-ultrasound applications.