A method and apparatus for producing a compound ultrasound cross-sectional picture of a body, in which method a plurality of partially overlapping body scans are carried out line-wise by the pulse-echo method in one scanning plane, thereby producing image signals in digital form corresponding to the...http://www.google.fr/patents/US4649927?utm_source=gb-gplus-shareBrevet US4649927 - Real time display of an ultrasonic compound image
