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Method and apparatus for ultrasonic synthetic transmit aperture imaging using orthogonal complementary codes

  • US 6,048,315 A
  • Filed: 09/28/1998
  • Issued: 04/11/2000
  • Est. Priority Date: 09/28/1998
  • Status: Expired due to Term
First Claim
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1. A system for imaging ultrasound scatterers, comprising:

  • an ultrasound transducer array including a multiplicity of transducer elements for transmitting ultrasound waves and detecting ultrasound echoes reflected by said ultrasound scatterers;

    transmit means coupled to said transducer array for pulsing a first number N of transducer elements, for N transmit events, with signals derived from N orthogonal complementary code sets, each of said code sets comprising N complementary code sequences;

    receive means coupled to said transducer array for receiving signals from a second number M of transducer elements of said multiplicity following each of said N transmit events, each set of signals received at said M transducer elements representing a respective received data sequence;

    analog-to-digital conversion means for converting each of the N×

    M received signals into a respective digital signal;

    means for decoding the N×

    M digital signals by computing the sum of the N received data sequences cross-correlated with the N orthogonal complementary code sequences transmitted from each respective one of said N transducer elements to form a decoded data set for said each respective one of said N transducer elements;

    beamforming means for forming a beamformed data set from the decoded data sets; and

    means (24) for displaying an image that is a function of said beamformed data set.

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