Brinks Hofer Gilson & Lione
Method and apparatus for forming medical ultrasound images
 A pulse echo beamforming system generates high spatial bandwidth ultrasound images using only a few transmit/receive events per frame. Each transmit/receive event consists of firing an unfocused or weakly focused wave and receiving and storing the echo on every receive channel. Each set of stored echoes is delayed and apodized to form component beams for each desired image point in the region insonified by that particular wave. The final images are synthesized by adding two or more of the component beams for each image point. 
Acuson Corporation
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Ching-Hua Lewis J. Charles E. David Kutay F.
Chou Thomas Bradley Napolitano Ustuner