Design, Fabrication, and Characterization of a Bifrequency Colinear Array.

Area of Science:

• Medical Imaging
• Acoustic Engineering
• Biomedical Technology

Background:

• Conventional ultrasound imaging faces limitations in resolution and penetration depth due to fixed operating frequencies.
• Achieving both high resolution and deep penetration is crucial for diverse medical diagnostic and surgical applications.

Purpose of the Study:

• To investigate a bifrequency colinear array designed to overcome the limitations of conventional ultrasound systems.
• To assess the performance of an 8 and 20 MHz bifrequency array for enhanced ultrasound imaging capabilities.

Main Methods:

• A 32-element bifrequency colinear array was designed, fabricated, and characterized.
• Real-time sectorial scan (S-scan) phantom imaging was performed using a Verasonics system.
• The array was tested in four transmit/receive frequency modes (low/high) to evaluate performance.

Main Results:

• Axial and lateral resolutions were calculated and compared across the four operating modes.
• The bifrequency array demonstrated potential for wideband fundamental imaging.
• The array also showed promise for advanced harmonic and subharmonic imaging techniques.

Conclusions:

• Bifrequency colinear arrays offer a viable solution for improving ultrasound imaging resolution and penetration depth.
• These arrays can enhance fundamental, harmonic, and subharmonic imaging modalities.
• The developed bifrequency array technology has significant potential for broad applications in medical ultrasound.