Tracking clutter filter for spectral & audio doppler
First Claim
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1. A method for adaptively filtering a clutter signal from a received echo signal from which spectral Doppler data will be generated, comprising the steps of:
- transmitting ultrasonic waves into a sample volume;
receiving an echo signal from the sample volume;
making a short-term averaged correlation estimate of a clutter signal in the received echo signal;
adaptively filtering out the clutter signal from the received echo signal by using the short-term averaged correlation estimate and a clutter filter, wherein filter coefficients of the clutter filter are not changed by said step of adaptively filtering; and
analyzing the filtered signal in order to generate spectral Doppler data.
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Abstract
In an adaptive clutter filter for spectral Doppler imaging using an ultrasound system, the stopband center frequency and/or bandwidth of the clutter filter are effectively adjusted on a short time scale to better eliminate moving clutter while allowing low velocity bloodflow signals to pass through.
61 Citations
20 Claims
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1. A method for adaptively filtering a clutter signal from a received echo signal from which spectral Doppler data will be generated, comprising the steps of:
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transmitting ultrasonic waves into a sample volume;
receiving an echo signal from the sample volume;
making a short-term averaged correlation estimate of a clutter signal in the received echo signal;
adaptively filtering out the clutter signal from the received echo signal by using the short-term averaged correlation estimate and a clutter filter, wherein filter coefficients of the clutter filter are not changed by said step of adaptively filtering; and
analyzing the filtered signal in order to generate spectral Doppler data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. As system for adaptively filtering a clutter signal from a received echo signal from which spectral Doppler data will be generated, comprising:
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an estimator for making a short-term averaged correlation estimate of a clutter signal in an echo signal received from a sample volume into which ultrasonic waves had been transmitted; and
a means for adaptively filtering out the clutter signal from the received echo signal by using the short-term averaged correlation estimate and a clutter filter with fixed filter coefficients.
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Specification