An ultrasound imaging system particularly adapted for detecting structure which reflects ultrasound at a variety of angles. There is a plurality of ultrasound transducers, which may be a linear array or a two-dimension array with the various horizontal rows of the array offset from one another, but having...http://www.google.co.uk/patents/US4489729?utm_source=gb-gplus-sharePatent US4489729 - Ultrasound imaging system
