An adaptive transducer array in which the element pitch is controlled by the imaging system depending on the mode of operation. A multiplicity of transducer elements are connected to a multiplicity of beamformer channels by a multiplexing arrangement having multiple states. In one multiplexer state,...http://www.google.de/patents/US5902241?utm_source=gb-gplus-sharePatent US5902241 - Large-aperture imaging using transducer array with adaptive element pitch control
