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Proceedings Paper

Noise suppression and correction of laser Doppler blood flow spectra after high-pass filtering
Author(s): K. J. Wierda; Reindert Graaff; R. R. van Someren; Frits F. M. de Mul; B. Leerkotte; Jan Greve
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Paper Abstract

Laser Doppler flowmetry (LDF) is a method that can be used for measuring blood flow changes in the microcirculation. We have contributed to the development of a new device for LDF, based on digital signal processing. A method for correcting the disregarding of frequency components was developed, by approximating the noise-free Doppler spectrum with an exponential shape. The frequency components from 40 kHz to 50 kHz can be used to correct for white noise. We introduced variable resistors for the case common mode components from both detectors have different magnitudes. However, after adjustment we found that noise may still be present. We have observed, that cutting off at 150 Hz suppresses many noise contributions and still provides sufficient Doppler information. For the transfer of a moment calculated from 150 Hz - 20 kHz into 0 - infinity Hz, the correction method mentioned above can be applied.

Paper Details

Date Published: 8 January 1996
PDF: 11 pages
Proc. SPIE 2629, Biomedical Optoelectronics in Clinical Chemistry and Biotechnology, (8 January 1996); doi: 10.1117/12.229525
Show Author Affiliations
K. J. Wierda, Univ. Groningen (Netherlands)
Reindert Graaff, Univ. Groningen (Netherlands)
R. R. van Someren, Univ. Hospital Groningen (Netherlands)
Frits F. M. de Mul, Univ. Twente (Netherlands)
B. Leerkotte, Univ. Twente (Netherlands)
Jan Greve, Univ. Twente (Netherlands)


Published in SPIE Proceedings Vol. 2629:
Biomedical Optoelectronics in Clinical Chemistry and Biotechnology
Stefan Andersson-Engels; Mario Corti; Ivan Kertesz; Norbert Kroo; Heinz P. Weber; Terence A. King; Riccardo Pratesi; Stefan Seeger, Editor(s)

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