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A sonographic technique to reduce beam distortion by curved interfaces
G Kossoff1, D A Carpenter, D E Robinson
1Ultrasonics Institute, Sydney, Australia.
Ultrasound in Medicine & Biology
|January 1, 1989
Summary
Ultrasonic beam distortion occurs at curved interfaces between different media. A new method using controlled time delays in multi-element transducers can reduce these distortions.
Area of Science:
- Acoustics
- Wave Propagation
- Medical Imaging
Background:
- Ultrasonic beams can be distorted when passing through interfaces between materials with different acoustic velocities.
- Curved interfaces within the ultrasonic beamwidth significantly impact beam propagation and image quality.
Purpose of the Study:
- To analyze the distorting effects of various curved interfaces on ultrasonic beams.
- To develop and present a technique for reducing ultrasonic beam distortion caused by interface curvature.
Main Methods:
- Simulation and analysis of ultrasonic beam propagation through different curved interface models.
- Development of a beamforming technique involving precise control of time delays to individual transducer elements.
Main Results:
- Quantification of ultrasonic beam distortion patterns resulting from various interface geometries.
- Demonstration that controlling element time delays effectively mitigates beam distortion.
Conclusions:
- Interface curvature is a significant factor in ultrasonic beam distortion.
- The proposed time-delay control technique offers a viable solution for improving ultrasonic imaging accuracy in the presence of curved interfaces.