A High-Performance 3-D Imaging Technique Using Simultaneous Azimuth and Elevation Compounding.

Area of Science:

• Ultrasound imaging
• Medical imaging technology
• Materials science

Background:

• Conventional ultrasound imaging faces limitations in achieving high resolution in all three dimensions.
• Row-column array (RCA) configurations offer potential for improved 3-D imaging.
• Electrostrictive piezoelectric materials are suitable for advanced transducer applications.

Purpose of the Study:

• To develop and validate a new 3-D ultrasound imaging technique using an RCA configuration.
• To achieve simultaneous fine delay control and high-quality two-way focusing in both azimuth and elevation.
• To demonstrate the feasibility of using modulated bias patterns for enhanced beamforming.

Main Methods:

• Development of a 3-D imaging technique employing an electrostrictive piezoelectric substrate with a row-column array (RCA).
• Integration of radiofrequency (RF) transmit/receive channels with independently controlled variable DC bias channels for modulated beamforming.
• Fabrication of a 20-MHz electrostrictive composite substrate with 64x64 electrodes and custom electronics for beamforming and biasing.

Main Results:

• Achieved high-quality two-way focusing in both azimuth and elevation planes.
• Measured -6 dB resolution of 93 µm axially, 273 µm in azimuth, and 328 µm in elevation.
• Experimental results closely matched simulated resolutions, validating the technique's performance.

Conclusions:

• The developed 3-D imaging technique with RCA and modulated bias patterns enables precise focusing and high resolution.
• This method significantly enhances ultrasound imaging capabilities in the elevation dimension.
• The technique holds promise for advanced medical imaging applications requiring superior spatial resolution.