ECG feature extraction using differentiation, Hilbert transform, variable threshold and slope reversal approach.
Summary of "ECG feature extraction using differentiation, Hilbert transform, variable threshold and slope reversal approach."
An accurate and reliable ECG feature extraction algorithm is presented in this paper. ECG samples are de-noised and its first derivative and Hilbert transform are computed. Sample having maximum amplitude in the transformed domain is found out and those samples having amplitudes within a lead wise specified threshold of that maximum are marked. In the original signal, where these marked samples undergo slope reversals are spotted as R-peak. On the left and right side of the R-peak, slope reversals are identified as Q and S peak, respectively. QRS onset-offset points, T and P waves are also detected. ECG baseline modulation correction is done after detecting characteristics points. The algorithm offers a good level of Sensitivity, Positive Predictivity and accuracy of R peak detection. Each wave and segment duration and each peak height is measured. Measurement errors of extracted ECG features are calculated. The algorithm is implemented on MATLAB 7.1 environment.
Affiliation
Department of Applied Physics, Faculty of Technology, University of Calcutta , 92 A.P.C. Road, Kolkata - 700 009 , India.
Journal Details
This article was published in the following journal.
Name: Journal of medical engineering & technology
ISSN: 1464-522X
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22946481
- DOI: http://dx.doi.org/10.3109/03091902.2012.713438
Medical and Biotech [MESH] Definitions
Analytic Sample Preparation Methods
Use of various chemical separation and extraction methods, such as SOLID PHASE EXTRACTION; CHROMATOGRAPHY; and SUPERCRITICAL FLUID EXTRACTION; to prepare samples for analytical measurement of components.
Differential Threshold
The smallest difference which can be discriminated between two stimuli or one which is barely above the threshold.
Serial Extraction
The selective extraction of deciduous teeth during the stage of mixed dentition in accordance with the shedding and eruption of the teeth. It is done over an extended period to allow autonomous adjustment to relieve crowding of the dental arches during the eruption of the lateral incisors, canines, and premolars, eventually involving the extraction of the first premolar teeth. (Dorland, 28th ed)
Extraction, Obstetrical
Extraction of the fetus by means of obstetrical instruments.
Solid Phase Extraction
An extraction method that separates analytes using a solid phase and a liquid phase. It is used for preparative sample cleanup before analysis by CHROMATOGRAPHY and other analytical methods.
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