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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
Abstract:
Ultrasonic beams are distorted during propagation between two media with different velocities if the traversed interface is curved within the ultrasonic beamwidth. The distorting effects of various interfaces on a beam generated by a multi-element transducer are analyzed and a technique to reduce these by controlling the time delays to the individual elements is presented.