Higher order moment processing of laser Doppler perfusion signals

Mikael L. Arildsson; Karin Wardell; Gert E. Nilsson

doi:10.1117/12.281499

1 October 1997 Higher order moment processing of laser Doppler perfusion signals

Mikael L. Arildsson, Karin Wardell, Gert E. Nilsson

Author Affiliations +

Journal of Biomedical Optics, Vol. 2, Issue 4, (October 1997). https://doi.org/10.1117/12.281499

Abstract

The laser Doppler technique is used to assess tissue perfusion. Traditionally an integrated, ω-weighted (firstorder filter) power spectrum is used to estimate perfusion. In order to be able to obtain selective information about the flow in vessels with different blood cell velocities, higher order filters have been implemented, investigated, and evaluated. Theoretical considerations show that the output of the signal processor will depend on the flow speed, for a given concentration of blood cells, according to S_out∝νⁿ where υ is the average blood cell speed and n is the spectral filter order. An implementation of filters using zero-, first-, second-, and third-order spectral moments was utilized to experimentally verify the theory by using a laser Doppler perfusion imager. Two different flow models were utilized: A Plexiglas model was used to demonstrate the various signatures of the power spectrum for different flow speeds and filter orders, whereas a Delrin model was used to study the relationship between the flow velocity and the output of the signal processor for the different filters. The results show good agreement with theory and also good reproducibility. Recordings made on the skin of the wrist area demonstrated that the flow in small veins can be visualized by the use of higher spectral orders.

Citation Download Citation

Mikael L. Arildsson, Karin Wardell, and Gert E. Nilsson "Higher order moment processing of laser Doppler perfusion signals," Journal of Biomedical Optics 2(4), (1 October 1997). https://doi.org/10.1117/12.281499

Published: 1 October 1997

Access the abstract

JOURNAL ARTICLE
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

CITATIONS

Cited by 13 scholarly publications.

Explore citations on Lens.org

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Signal processing

Optical filters

Filtering (signal processing)

Doppler effect

Blood

Electronic filtering

Image filtering

Show All Keywords

RELATED CONTENT

A fast preview restoration algorithm for space-variant degraded images
Proceedings of SPIE (September 28 2016)

Optical Processing For Adaptive Radar Systems
Proceedings of SPIE (February 29 1980)

Exponential-quadratic optimal signal reconstruction in noisy filter banks
Proceedings of SPIE (December 04 2000)

New hardware implementation of fast vector median filters
Proceedings of SPIE (October 22 1993)

Laser Doppler echo signal detection method
Proceedings of SPIE (May 20 2009)

Time of correlation of low frequency fluctuations in the regional...
Proceedings of SPIE (May 08 2012)

Synthetic discriminant function filter performance evaluations
Proceedings of SPIE (September 01 1990)

Subscribe to Digital Library

Receive Erratum Email Alert

Show All Keywords

Keywords/Phrases

Search In:

Publication Years