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Optimum focusing in an ultrasonic annular array imaging system using a nonspherical lens
1Department of Electrical Engineering, Korea Advanced Institute of Science & Technology, Seoul.
Ultrasonic Imaging
|July 1, 1989
Summary
A novel focusing method for ultrasonic imaging systems uses a nonspherical lens and dynamic focusing to minimize lateral resolution. This technique optimizes transmit delays for improved sidelobe suppression and beam width, enhancing image clarity.
Area of Science:
- Medical Imaging
- Acoustics
- Ultrasound Technology
Background:
- Ultrasound imaging systems require precise focusing for optimal resolution.
- Annular array systems present unique challenges in achieving desired beam characteristics.
Purpose of the Study:
- To introduce a new focusing method for ultrasonic annular array imaging systems.
- To minimize lateral resolution while maintaining specified sidelobe suppression.
Main Methods:
- Development of an analysis model for impulse response of an annulus with an arbitrarily-shaped lens.
- Application of an iterative technique to determine optimum transmit delay profiles.
- Implementation of continuous dynamic focusing in receive mode using a digital focusing system.
Main Results:
- An effective analysis model for impulse response calculation was developed.
- An optimum transmit delay profile was obtained, minimizing lateral beam width.
- Experimental validation confirmed the analysis model and lens design.
Conclusions:
- The proposed focusing method effectively minimizes lateral resolution and suppresses sidelobes.
- The digital focusing system allows for arbitrary control of delays and dynamic focusing.
- The study validates a new approach for enhancing ultrasonic imaging performance.
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