Time-resolved detection of small objects in turbid media by diffusive light: simulation versus experiment

Kristel F. L. Michielsen; H. De Raedt; J. Calsamiglia; N. Garcia; Janusz Przeslawski

doi:10.1117/12.308204

13 May 1998 Time-resolved detection of small objects in turbid media by diffusive light: simulation versus experiment

Kristel F. L. Michielsen, H. De Raedt, J. Calsamiglia, N. Garcia, Janusz Przeslawski

Proceedings Volume 3254, Laser-Tissue Interaction IX; (1998) https://doi.org/10.1117/12.308204
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

Abstract

A method is presented to simulate the light propagation in turbid media. Based on a numerical algorithm to solve the time-dependent diffusion equation, the method takes into account spatial variations of the reduced scattering and absorption factors of the medium due to the presence of objects as well as random fluctuations of these factors. The simulation results for tissuelike phantoms are compared to experimental data and excellent agreement is found. The technique is employed to explore the possibility of locating millimeter-sized objects, immersed in turbid media, from time- resolved measurements of the transmitted or reflected (near- infrared) light. A method is proposed to enhance the imaging power of the time-resolved technique. Using the data- processing technique we find that it is possible to detect 1 mm-diameter objects, independent of their location within the sample and under unfavorable conditions. Experimental data of a time-resolved reflection experiment on a 1 mm diameter tube filled with blood and embedded in an intralipid solution are presented. The results show that, using the data processing technique, it is possible to detect the tube to a depth of 15 mm from the illuminated surface in a 70 mm thick sample. Simulation data are in excellent agreement with these experimental results.

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Kristel F. L. Michielsen, H. De Raedt, J. Calsamiglia, N. Garcia, and Janusz Przeslawski "Time-resolved detection of small objects in turbid media by diffusive light: simulation versus experiment", Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); https://doi.org/10.1117/12.308204

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KEYWORDS

Signal processing

Scattering

Light scattering

Picosecond phenomena

Absorption

Sensors

Tissue optics

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