Siemens Medical Systems, Inc.

Ja-Il Koo

Dong-Chyuan Liu

Ultrasound echo data is analyzed to compress jump noises by recalculating the value of data points whose magnitude exceeds the magnitude of a previous point by more than a predefined threshold. Any data that exceeds the threshold is recalculated according to the value of the slopes of the points that precede and after the point to be replaced. The value by which a data point is compressed is selected so that the DC component of the points after compression is nearly equal to the DC component of the points prior to the jump noise. In addition, to remove saturating clutter in a Doppler display or audio signal, the present invention determines if the power spectrum of the Doppler signals to be displayed exceeds a maximum power display and if so scales a portion of the I and Q signals that comprise the Doppler power spectrum by the ratio of the maximum power spectrum computed and the maximum that can be displayed.

Method and apparatus for noise suppression in a doppler ultrasound

An improved digital wall filter comprises an infinite impulse response (IIR) second order digital filter. The coefficients w(-1) and w(-2) are pre-initialized from a set of m samples of the input signal. The number of samples m is related to the ratio of a constant .gamma., selected between 0 and 1, and the feedback filter coefficients. To ensure maximum performance of the filter, the filter is periodically re-initialized before filtering a new set of input data. To produce a video line, the filtered data created from the input samples used to initialize the filter are averaged with data that was not used to initialize the filter.

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Phoenix, AZ, United States of America

Ja-Il Koo