Filter to reduce speckle artifact in ultrasound imaging

Details Filter to reduce speckle artifact in ultrasound imaging Filter to reduce speckle artifact in ultrasound imaging

1993-11-26

1995-04-25

Manuel, George

Surgery

Truss

Pad

12866108, 73626, A61B 800

Patent

active

054090075

ABSTRACT:
A method for reducing speckle artifact in an ultrasound image using a two-dimensional median filter having a diamond-shaped five-point kernel. The entire pixel image data is passed through the filter in a manner such that the center point of the kernel is effectively stepped down each range vector in sequence. The magnitudes of the pixel data at each of the five points in the kernel are compared and the value which has the middle magnitude is adopted as a new pixel value, which is substituted for the old pixel value at the center point. After a new filtered vector has been formed from the new pixel values produced at successive center points by stepping down one acoustic vector, the kernel is shifted by one vector and stepped down range again. This process continues through the entire set of vectors until a new set of filtered vectors is formed. This filter will remove speckle holes on the order of one pixel in size while preserving good edge definition.

REFERENCES:
patent: 4644795 (1987-02-01), Augustine
patent: 4683893 (1987-08-01), Mayo
patent: 5199437 (1993-04-01), Landberg

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