Method and apparatus for adaptive filtering by counting acoustic

Details Method and apparatus for adaptive filtering by counting acoustic Method and apparatus for adaptive filtering by counting acoustic

1998-12-01

2000-10-24

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

A61B 800

Patent

active

061359629

ABSTRACT:
An ultrasound imaging system having an adaptive spatial filter the filter coefficients of which, for particular image parameter sample, are determined by counting the number of neighboring image parameter samples having zero or near-zero values. If the number of zero or near-zero values in a data window is greater than a predetermined threshold, the data in the window is passed, not filtered. This filter has two advantages over other spatial filters. First, image parameter data samples having only zero or near-zero neighboring values (i.e., isolated "point noise") are not smeared. Second, boundaries such as the edge of color in a vessel (where the surrounding area is black, i.e., the color image parameter values are zero or near zero) are not smoothed as much as in conventional filters, preserving the sharpness of the edge.

REFERENCES:
patent: 5544659 (1996-08-01), Banjanin
patent: 5664575 (1997-09-01), Banjanin et al.

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