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Proceedings Paper

Investigation of laser Doppler techniques using the Monte Carlo method
Author(s): Walter Ruetten; Thomas Gellekum; Katrin Jessen
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Paper Abstract

Laser Doppler techniques are increasingly used in research and clinical applications to study perfusion phenomena in the skin, yet the influences of changing scattering parameters and geometry on the measure of perfusion are not well explored. To investigate these influences, a simulation program based on the Monte Carlo method was developed, which is capable of determining the Doppler spectra caused by moving red blood cells. The simulation model allows for the definition of arbitrary networks of blood vessels with individual velocities. The volume is represented by a voxel tree with adaptive spatial resolution which contains references to the optical properties and is used to store the location dependent photon fluence determined during the simulation. Two evaluation methods for Doppler spectra from biological tissue described in the literate were investigated with the simulation program. The results obtained suggest that both methods give a measure of perfusion nearly proportional to the velocity of the red blood cells. However, simulations done with different geometries of the blood vessels seem to indicate a nonlinear behavior concerning the concentration of red blood cells in the measurement volume. Nevertheless these simulation results may help in the interpretation of measurements obtained from devices using the investigated evaluation methods.

Paper Details

Date Published: 31 January 1995
PDF: 12 pages
Proc. SPIE 2326, Photon Transport in Highly Scattering Tissue, (31 January 1995); doi: 10.1117/12.200830
Show Author Affiliations
Walter Ruetten, Aachen Univ. of Technology (Germany)
Thomas Gellekum, Aachen Univ. of Technology (Germany)
Katrin Jessen, Aachen Univ. of Technology (Germany)


Published in SPIE Proceedings Vol. 2326:
Photon Transport in Highly Scattering Tissue

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