Ultrasound imaging system using finite impulse response digital clutter filter with forward and reverse coefficients
Patent 5249578 Issued on October 5, 1993. Estimated Expiration Date: 
September 15, 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.
September 15, 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 ReferencesUltrasound system with dynamic transmit focus Time frequency control filter for an ultrasonic imaging system Aberration correction using beam data from a phased array ultrasonic scanner Phased array ultrasonic beam forming using oversampled A/D converters Patent #: 5203335 InventorsApplicationNo. 945313 filed on 09/15/1992US Classes:600/447, Electronic array scanning73/626SwitchedExaminersPrimary: Kamm, William E.Assistant: Manuel, George International ClassA61B 008/00AbstractAn asymmetric finite impulse response digital filter, typically used in an ultrasound imaging system, includes forward and reverse sections. In the forward section, a group of input data samples is multiplied by a set of filter coefficients in a forward order to provide first intermediate results. The first intermediate results are summed to provide a first output sample. In the reverse section, the group of input data samples is multiplied by the set of coefficients in a reverse order as compared with the forward section to provide second intermediate results. The second intermediate results are summed to provide a second output sample. The process is repeated to provide multiple first and second output samples. A signal estimation unit estimates a characteristic of the input data samples, such as the frequency of a Doppler ultrasound signal, based on the first and second output samples. The filter provides twice as many output samples as prior art filters for a given set of input data samples. The filter is preferably used as a clutter filter to remove low frequency clutter from a Doppler ultrasound signal.Other References
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