An ultrasonic imaging system may include a transducer array having a novel distribution of transducer elements. Preferred embodiments of the system include a transducer having a linear, curved linear, or matrixed array of piezoelectric transducer elements. The transducer may include a novel distribution...http://www.google.com/patents/US5931785?utm_source=gb-gplus-sharePatent US5931785 - Ultrasonic transducer having elements arranged in sections of differing effective pitch
