Ultrasonic diagnostic imaging of harmonic frequencies with speckle reduction processing
Patent 5908389 Issued on June 1, 1999. Estimated Expiration Date: 
June 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 17, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re35148 Methods of and systems for examining tissue perfusion using ultrasonic contrast agents Ultrasonic processes and circuits for performing them Transmit beamformer with frequency dependent focus Method and apparatus for beamformer system with variable aperture Ultrasonic harmonic imaging system and method Patent #: 5740128 InventorsAssigneeApplicationNo. 099052 filed on 06/17/1998US Classes:600/443Anatomic image produced by reflective scanningExaminersPrimary: Jaworski, Francis J.Attorney, Agent or FirmInternational ClassA61B 008/00AbstractAn ultrasonic diagnostic imaging system and methods are described which produces ultrasonic images from harmonic echo components of a transmitted fundamental frequency. Preferably, a programmable digital filter is used to pass harmonic echo components for image processing to the exclusion of fundamental frequency signals. In a preferred embodiment, artifacts are removed by producing decorrelated replicas of the harmonic signals, which are then combined and used for imaging. To produce an image in the presence of depth dependent attenuation of high frequency echo signals, both fundamental and harmonic echo signals are processed and used to produce an image blended from components of both fundamental and harmonic echo signals.Other References
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