Depth dependent bandpass of ultrasound signals using heterodyne mixing
Patent 5218869 Issued on June 15, 1993. Estimated Expiration Date: 
January 14, 2012. 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.
January 14, 2012. 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 ReferencesUltrasonic imaging apparatus operating according to the impulse-echo method Ultrasound imaging system Improved method and device for measuring frequency dependent parameters of objects by means of ultrasound echography Measurement of wave propagation power flow in structures Apparatus for characterizing ultrasonic medium Patent #: 4757715 InventorAssigneeApplicationNo. 820516 filed on 01/14/1992US Classes:73/629, Having unitary sonic type transmitter-receiver transducer600/442Tissue attenuation or impedance measurement or compensationExaminersPrimary: Williams, HezronAssistant: Ashraf, Nashmiya Attorney, Agent or FirmInternational ClassG01N 029/000AbstractAn ultrasound imaging system and method for examining the interior of an object. The imaging system includes an apparatus for transmitting and receiving ultrasound waves. A receiver amplifies echo signals from over a range of depths from within the object and generates electrical signals, each having a spatial spectrum. The imaging system also includes a compensation apparatus which compensates the spectral distribution of the signal by sweeping the spectrum of the signals in accordance with the depth from which the echo signals are reflected. In the currently preferred embodiment, the compensation apparatus sweeps from the low frequencies to the high frequencies of the spectrum. | |
