Method and Device for the Determination of Murmur Frequency Band

• US 20110021939A1
• Filed: 02/06/2009
• Published: 01/27/2011
• Est. Priority Date: 02/06/2008
• Status: Active Grant

• Current Assignee: Capis SPRL
• Original Assignee: Capis SPRL
• Inventors: Gharehbaghi, Arash, Sepehri, Amir A.
• Granted Patent: US 8,649,854 B2
• Time in Patent Office: Days
• US Class Current: 600/528
• CPC Class Codes: A61B 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: A61B 5/7267 involving training the classification device
• CPC Class Codes: A61B 7/00 Instruments for auscultation
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

The present invention is related to a method for the determination of frequency band characteristic of a heart disease comprising the steps of: recording a first set of phonocardiograms from a first set of reference healthy patients, and a second set of phonocardiograms from a second set of patients suffering of said heart disease; calculating spectral energies of all possible frequency bands; comparing said spectral energies of all possible frequency bands for determining an optimized frequency band giving rise to the maximal distinction between spectral energies of the phonocardiograms from first and second set of phonocardiograms.

Claims

1. A method for a determination of frequency band characteristic of a heart disease comprising the steps of:

collecting and/or recording a first set of phonocardiograms from a first set of reference healthy patients, and a second set of phonocardiograms from a second set of patients suffering of said heart disease;

defining a frequency sampling rate and a maximum cutoff frequency, producing a finite set of sampled frequencies;

calculating spectral energies at all sampled frequencies;

calculating spectral energies of all possible frequency bands;

comparing said spectral energies of all possible frequency bands;

determining a frequency band giving for rise to a maximal distinction between spectral energies of the said phonocardiograms from the first and the second set of phonocardiograms.

3. The method according to claim 1 wherein the heart disease is selected from the group consisting of ventricular septal defect, patent ductus arteriosus, pulmonary valve stenosis, tetralogy of fallot, aortic stenosis, atrial septal defect, coarctation of aorta, transposition of great arteries, atrioventricular septal defect, truncus arteriosus, tricuspid atresia, anomalous pulmonary pulmonary venous connection or a mixture thereof.

4. The method according to claim 1 wherein the cutoff frequency is about 500 hz.

10. The method according to claim 1 wherein the spectral energies are calculated only in the systolic segment of the phonocardiogram.

11. The method according to claim 1 wherein the comparison between phonocardiograms is performed by a neural network.

12. The method according to claim 11 wherein the neural network is of multilayer perceptron type.

13. A device comprising phonocardiogram (s) recording media, phonocardiogram (s) storage media, output media, a processor and a set of instructions for performing the method according to claim 1.

14. A set of instructions, on a computer readable media, executable on a programmable device, which when executed on said programmable device, performs the method according to claim 1.

2. A method for a detection of heart diseases comprising the steps of:

collecting and/or recording a first set of phonocardiograms from a first set of reference healthy patient, and a second set of phonocardiograms from a second set of patients suffering of a heart disease;

determining frequency band giving rise to a maximal distinction between spectral energies of the said phonocardiograms from the first and the second set of phonocardiograms;

comparing said determined frequency band energy of phonocardiograms of a patient to corresponding frequency band energy of the first and the second set of phonocardiograms to define if said patient suffers of the heart disease.

5. The method according to claim 2 wherein the determined frequency band is comprised between 88 Hz and 96 Hz and the heart disease is ventricular septal defect.

6. The method according to claim 2 wherein the determined frequency band is comprised between 50 Hz and 60 Hz and the heart disease is tetralogy of fallot.

7. The method according to claim 2 wherein the determined frequency band is comprised between 15 Hz and 121 Hz and the heart disease is ventricular patent ductus arteriosus.

8. The method according to claim 2 wherein the determined frequency band is comprised between 17 Hz and 129 Hz and the heart disease is aortic stenosis.

9. The method according to claim 2 wherein the determined frequency band is comprised between 16 Hz and 32 Hz and the heart disease is pulmonary valve stenosis.