Dynamic spectral phonocardiograph
First Claim
1. A method of producing automated diagnosis of heart disease in a patient from irregular heart sound patterns at different portions of a heart cycle, comprising steps of:
- a. producing a computer-based catalog of sets of first spectral expansion coefficients based on Fourier analysis of heart sounds from previous diagnosis of representative cases of irregular heart ground patterns;
b. producing a set of second spectral expansion coefficients based on Fourier analysis of heart sounds for a particular unknown example of irregular heart ground patterns;
c. performing generalized scalar products of the set of second spectral expansion coefficients with each of said sets of first expansion coefficients and for producing a heart disease identification signal based on a maximum value of the generalized scalar products.
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Abstract
A system of generating a spectral phonocardiogram which summarizes time-dependent changes in the heart sounds throughout the heart cycle. The system is based on the projection of spectral surfaces of the Fourier transform of heart sounds as a function of time and is a useful diagnostic tool both for a cardiologist and a general practitioner. Permanent copies of the spectral phonocardiograms can provide useful records for monitoring the development of heart disease in a given individual. The system provides a useful means for rapid screening of large groups of people for heart disease by non-specialists in cardiology. A variant of the system provides automated computer diagnosis of the probable nature of the heart disease.
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Citations
12 Claims
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1. A method of producing automated diagnosis of heart disease in a patient from irregular heart sound patterns at different portions of a heart cycle, comprising steps of:
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a. producing a computer-based catalog of sets of first spectral expansion coefficients based on Fourier analysis of heart sounds from previous diagnosis of representative cases of irregular heart ground patterns; b. producing a set of second spectral expansion coefficients based on Fourier analysis of heart sounds for a particular unknown example of irregular heart ground patterns; c. performing generalized scalar products of the set of second spectral expansion coefficients with each of said sets of first expansion coefficients and for producing a heart disease identification signal based on a maximum value of the generalized scalar products. - View Dependent Claims (2, 3, 4, 5, 6)
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4. The method according to claim 3, wherein the second weighting function is an A-weighting function.
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5. The method according to claim 3, wherein the second weighting function is a B-weighting function.
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6. The method according to claim 3, wherein the second weighting function is a C-weighting function.
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7. A device for producing automated diagnosis of heart disease in a patient from irregular heart sound patterns at different portions of a heart cycle, comprising:
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a. means for producing a computer-based catalog of sets of first spectral expansion coefficients based on Fourier analysis of heart sounds from previous diagnosis of representative cases of irregular heart ground patterns b. means for producing a set of second spectral expansion coefficients based on Fourier analysis of heart sounds for a particular unknown example of irregular heart ground patterns; and c. means for performing generalized scalar products of the set of second spectral expansion coefficients with lack of said sets of first expansion coefficients and for producing a heart disease identification signal based on a maximum value of the generalized scalar products. - View Dependent Claims (8, 9, 10, 11, 12)
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10. The device according to claim 9, wherein the second weighting function is an A-weighting function.
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11. The device according to claim 9, wherein the second weighting function is a B-weighting function.
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12. The device according to claim 9, wherein the second weighting function is a C-weighting function.
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Specification