A synthetic four sides boundary scanner array is provided for an ultrasound mammography system. Projector and hydrophone elements are alternately disposed on the four array sides for stepped movement along the four sides during a scan of a breast volume. Electric signals generated by the hydrophone elements...http://www.google.com/patents/US5318028?utm_source=gb-gplus-sharePatent US5318028 - High resolution ultrasound mammography system and boundary array scanner therefor
