Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1996-12-30
1998-04-07
Jaworski, Frances
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600455, A61B 800
Patent
active
057357978
ABSTRACT:
An ultrasound imaging system for displaying edge-enhanced topographic flow power data surrounded by B-mode anatomical data without masking out any significant edge-enhanced topographic flow power data and without displaying any significant flow power background noise. An improved high-pass topographic filter is used to enhance the edges of the flow in the displayed image in both the horizontal (lateral) and vertical (range) directions. The two-dimensional topographic filter is a digital filter with three taps in each dimension and is incorporated in the acoustic line memory. Also, the raw flow power data is compressed down to 7 bits in such a way that the transfer function is shifted away from zero input power. In this way, the system gain can be set to effectively zero out most of the background noise. After the flow power data passes through the high-pass topographic filter, it is mapped to values between -128 and +127 (8 bits) with zero in the middle. The system gain is set so background flow power noise will be mapped relatively uniformly to within .+-.2 of zero out of the topographic filter. The center of the color map (within .+-.2 of zero) is masked out so that any edge-enhanced topographic flow power that maps within this range is not displayed and, instead, the B-mode imagery is displayed.
REFERENCES:
patent: 5190044 (1993-03-01), Kawasaki et al.
patent: 5394874 (1995-03-01), Forestieri et al.
Alexander Edgar Joseph
Muzilla David John
Schubert Patricia
Flaherty Dennis M.
General Electric Company
Jaworski Frances
Pilarski John H.
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