Method and apparatus for pulsed doppler imaging using coded excitation on transmit and pulse compression on receive

摘要

A system for estimating and displaying Doppler frequency shifts produced by moving ultrasound scatterers, comprising: an ultrasound transducer array (2) for transmitting ultrasound waves and detecting ultrasound echoes reflected by said ultrasound scatterers, said transducer array comprising a multiplicity of transducer elements; transmit means (20, 22, 24) coupled to said transducer array for pulsing selected transducer elements which form a transmitt aperture with a coded pulse sequence during first and second transmit firings which are focused at substantially the same transmit focal position, said coded pulse sequence being a function of a transmit code convolved with a base pulse sequence; receive means (26, 28) coupled to said transducer array for receiving first and second sets of signals from selected transducer elements which form a receive aperture subsequent to said first and second transmit firings respectively; means (30) for forming first and second beamsummed signals respectively derived from said first and second sets of signals; a decoding filter (32) for compressing said first and second beamsummed signals to form first and second compressed pulse sequences respectively; processing means (not shown) for producing a set of Doppler frequency shift data which is dependent in part on said first and second compressed pulse sequences; and means (not shown) for displaying a spectral line which is a function of said set Doppler frequency shift data. 3584 כ" ו בכסלו התשס" ג - December 1, 2002