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A calibration standard for laser-Doppler perfusion measurements (1995)

Liebert, A. ; Leahy, M. ; Maniewski, R.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 66 (1995), S. 5169-5173

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: The objective of the present study was the development of a new calibration standard for the laser-Doppler perfusion monitors. The beat frequency spectrum obtained from a solution of latex spheres undergoing Brownian motion was compared to that obtained from a porous polyethylene material containing the same solution. The mixture of static and dynamic scattering events in the latter case was expected to produce a spectrum similar to that obtained in the real human tissue. The results obtained demonstrate clearly the difference between the signals recorded from the commonly used motility standard which are the result of multiple Doppler shifting and homodyne mixing, and those generated from our enhanced model which predominantly result from single Doppler shifting and heterodyne mixing. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1146145

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Risk evaluation of ventricular tachycardia using wavelet transform irregularity of the high-resolution electrocardiogram (2000)

Lewandowski, P. ; Meste, O. ; Maniewski, R. ; [et al.]

Springer

Medical & biological engineering & computing 38 (2000), S. 666-673

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ISSN: 1741-0444

Keywords: High-resolution ECG ; Late potentials ; Spectro-temporal analysis ; Wavelet transform ; Ventricular tachycardia

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: Abstract A new method for analysis of high-resolution ECG signals using a wavelet transform based on a modified Morlet function is presented. A polynomial filter is used to reduce low-frequency, high-amplitude noise components in the analysed signals. The method is tested on test ECG signals with simulated late potentials and finally verified on two post-infarction patient (PP) groups: 62 PPs with ventricular tachycardia and 44 PPs without arrhythmia. A new quantitative parameter, the irregularity factor, is proposed for discrimination between the study groups. The results show a significant difference in the parameter values for tachycardia patients compared with those for patients without arrhythmia. The sensitivity of the proposed method is 85%, and the specificity is 93%.