An ultrasonic imaging system (50) has an array (52) of transducer elements (54-1 through 54-21) for receiving ultrasonic signals reflected from within an inhomogeneous object (16) being examined. The system (50) has a means (80, 84, 88, 94) connected to generate an image in response to the ultrasonic...http://www.google.se/patents/US4471785?utm_source=gb-gplus-sharePatent US4471785 - Ultrasonic imaging system with correction for velocity inhomogeneity and multipath interference using an ultrasonic imaging array
