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US 5,327,893 AGranted
Detection of cholesterol deposits in arteries
AssigneeRensselaer Polytechnic Institute
InventorMichael Savic
Life of this patent
Estimating the term…
Abstract
A method of diagnosing arterial stenosis from a received Doppler shifted acoustic signal from an artery during multiple heartbeats, each having systolic and diastolic phases uses pattern recognition techniques that are applied to the signal to determine the presence of turbulence during the diastolic phases which indicates stenosis. This is advantageously done by comparing the systolic and diastolic phases as part of the pattern recognition technique, large differences being indicative of a healthy artery and smaller differences being indicative of stenosis.
Claims14
A method of diagnosing arterial stenosis comprising:
- detecting an acoustic signal from an artery;
- digitizing the acoustic signal to form a digital signal on which computational analysis can be performed;
- and
- subjecting the digital signal to pattern recognition analysis to distinguish digital signals of an artery with stenosis from digital signals of a normal artery;
- the digital signal containing a plurality of features each in a multidimensional feature space, the pattern recognition analysis comprising the steps of:
- selecting features which are dominant for stenosis, from the digital signal;
- projecting each selected featured in its multidimensional feature space into a selected direction for increasing discrimination between digital signals of arteries having stenosis and digital signal of arteries without stenosis;
- and
- classifying the projected features to discriminate between projected features of arteries having stenosis from projected features of arteries without stenosis.
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Dependencies are inferred from the claim text.