Ultrasound blood flow monitor of the non-doppler type
First Claim
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1. A method of measuring the velocity of a moving scatterer using ultrasound, comprising the steps of:
- transmitting a series of ultrasonic waves toward the moving scatterer;
receiving a series of ultrasonic waves reflected back by the moving scatterer;
converting the reflected back series of ultrasonic waves into a corresponding series of echo signals;
identifying in a first echo signal a zero-crossover amplitude feature and a direction corresponding to such feature;
determining location of a corresponding zero-crossover amplitude feature having the same direction in successive echo signals; and
deriving velocity of the scatterer from changes in the zero-crossover amplitude feature location among the successive echo signals.
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Abstract
Reflected-back ultrasound waves are recorded and rebinned in accordance with a particular data classification scheme. In a post processing step, the data is processed to remove the effect of stationary scatterers (such as slowly-moving body structure) and features of the processed data are computer-traced to determine e.g. the velocity of the patient'"'"'s blood stream.
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Citations
3 Claims
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1. A method of measuring the velocity of a moving scatterer using ultrasound, comprising the steps of:
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transmitting a series of ultrasonic waves toward the moving scatterer; receiving a series of ultrasonic waves reflected back by the moving scatterer; converting the reflected back series of ultrasonic waves into a corresponding series of echo signals; identifying in a first echo signal a zero-crossover amplitude feature and a direction corresponding to such feature; determining location of a corresponding zero-crossover amplitude feature having the same direction in successive echo signals; and deriving velocity of the scatterer from changes in the zero-crossover amplitude feature location among the successive echo signals.
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2. A method of measuring the velocity of moving scatterers using ultrasound, comprising the steps of:
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transmitting ultrasonic waves toward the moving scatterers; receiving a superposition of multiple ultrasonic waves reflected back by the moving scatterers; converting at a transducer the reflected back waves into an ensemble of echo signals having a characteristic fringe pattern of constructive and destructive interference among the multiple reflected back ultrasonic waves corresponding to the ensemble; repeating the steps of transmitting, receiving, and converting to achieve a sequence of ensembles of echo signals; identifying a zero-crossover and a direction of such cross-over in one ensemble of the sequence of ensembles; tracking the location of a corresponding zero-crossover of the same direction in adjacent ensembles; and deriving velocity of the scatterers from changes in the zero-crossover location among successive ensembles. - View Dependent Claims (3)
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Specification