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Proceedings Paper

New multichannel DSP-based laser Doppler flowmetry analysis system for quantification of ocular blood flow
Author(s): Benno L. Petrig; Jean-Pierre Gehrig; Pierre Pompili
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Paper Abstract

The physiology and pathology of the ocular microcirculation is of interest in several prevalent eye diseases. Quantification of blood flow in ocular tissues at high temporal and spatial resolution, essential for the early detection of alterations during the disease process, requires highly sensitive measurement techniques such as laser Doppler flowmetry (LDF). Spatial resolution is important when attempting to measure blood flow in tissue layers at different depths and can be increased by reducing the probing laser's spot size and using detectors with very small apertures, however, at the expense of lower Doppler signal-to-noise ratio and greater variability of the measurements. To improve LDF signal-to-noise, while retaining the increased spatial resolution of small measuring volumes, a multi- channel approach was undertaken. A new LDF analysis card was designed using a TMS320C31 digital signal processor providing independent LDF analysis of up to 4 analog input channels. Two cards are used in parallel to analyze the output signals of a compound 7-channel detector. Analysis results of all channels are continuously uploaded to a PC which averages the channels and provides the user interface.

Paper Details

Date Published: 31 January 2001
PDF: 10 pages
Proc. SPIE 4156, Clinical Lasers and Diagnostics, (31 January 2001); doi: 10.1117/12.413692
Show Author Affiliations
Benno L. Petrig, Institut de Recherche en Ophtalmologie (Switzerland)
Jean-Pierre Gehrig, Haute Ecole Valaisanne (Switzerland)
Pierre Pompili, Haute Ecole Valaisanne (Switzerland)


Published in SPIE Proceedings Vol. 4156:
Clinical Lasers and Diagnostics
Patrick Brouwer, Editor(s)

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