Spectrum analysis of coronary artery turbulent blood flow
First Claim
1. A method comprising:
- acquiring vibrational cardiac data from a transducer wherein the transducer is coupled to a human;
selecting a master replica from a segment of the vibrational cardiac data;
correlating the master replica with the segment to obtain a plurality of local maxima; and
extracting vibrational cardiac data that were emitted during a diastolic interval from each heart cycle with the aid of the plurality of local maxima.
1 Assignment
0 Petitions
Accused Products
Abstract
A method includes acquiring vibrational cardiac data from an array of N transducers wherein the transducers are coupled to a human. A master replica is selected from a segment of the vibrational cardiac data. The master replica is correlated with the segment to obtain a plurality of local maxima. Vibrational cardiac data that were emitted during a diastolic interval are extracted from each heart cycle with the aid of the plurality of local maxima. A two-dimensional space-time frequency power spectrum is processed for Equivalent Rectangular Bandwidth, which provides estimates of the energy produced by turbulent blood flow through a coronary stenosis.
12 Citations
37 Claims
-
1. A method comprising:
-
acquiring vibrational cardiac data from a transducer wherein the transducer is coupled to a human; selecting a master replica from a segment of the vibrational cardiac data; correlating the master replica with the segment to obtain a plurality of local maxima; and extracting vibrational cardiac data that were emitted during a diastolic interval from each heart cycle with the aid of the plurality of local maxima. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for processing acquired synchronized diastolic interval vibrational cardiac data (DI data) collected by an array of transducers during a plurality of heart cycles from a human, comprising:
-
performing a time-to-frequency transformation on the DI data, wherein the performing is applied to the DI data acquired from each transducer during the plurality of heart cycles to obtain a plurality of transducer channel frequency complex Fourier spectra; calculating a cross-channel spectral density matrix (CSDM) from the plurality of transducer frequency spectra, wherein the CSDM is calculated as a time average over the time synchronized plurality of heart cycles; performing an eigenvalue-eigenvector decomposition (EED) of the CSDM to obtain a spatial frequency number versus temporal frequency representation of the DI data. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
-
36. An apparatus comprising:
-
a data processing device configured to accept acquired diastolic interval vibrational cardiac data (DI data) collected by an array of transducers during a plurality of heart cycles; and a computer readable medium containing executable computer program instructions, which when executed by the data processing system, cause the data processing system to perform a method comprising; partitioning a diastolic interval into S time slots; performing a time-to-frequency transformation on the DI data acquired within a slot of the S time slots, wherein the performing is applied to the DI data acquired from each transducer to obtain a plurality of transducer complex frequency spectra; calculating a cross-channel spectral density matrix (CSDM) from the plurality of transducer complex frequency spectra, wherein the CSDM is calculated as a time average over a plurality of heart cycles; performing an eigenvalue-eigenvector decomposition (EED) of the CSDM to obtain a spatial frequency number verses temporal frequency representation of the DI data. - View Dependent Claims (37)
-
Specification