| http://www.w3.org/ns/prov#value | - cer elements making up said receive aperture of said transducer array for acquiring a beamsummed signal subsequent to said transmit firing; a filter for passing a harmonic frequency component comprising a band of frequencies of said beamsummed signal substantially centered at a frequency nf0, where n is a positive integer greater than or equal to 2; a processor programmed to form an image signal f
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