Ultrasound imaging system using finite impulse response digital

Details Ultrasound imaging system using finite impulse response digital Ultrasound imaging system using finite impulse response digital

1992-09-15

1993-10-05

Kamm, William E.

Surgery

Truss

Pad

73626, A61B 800

Patent

active

052495787

ABSTRACT:
An 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.

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S. Thomas Alexander, Adaptive Signal Processing, Springer-Verlag, 1986, Chapter 3, pp. 34-45.
M. A. Brandestini et al, "Blood Flow Imaging Using A Discrete Time Frequency Meter", 1978 Ultrasonics Sym. Proc., pp. 348-352.
M. Brandestini, "Topoflow-A Digital Full Range Doppler Velocity Meter", IEEE Trans. Sonics & Ultra., vol. SU-25, No. 5, Sep. 1978, pp. 287-293.
M. K. Eyer et al., "Color Digital Echo Doppler Image Presentation", Ultrasound in Med. & Biol., vol. 7, pp. 21-31.

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