Monte Carlo simulations of backscattered light intensity from convex and concave surfaces with an optical fiber array sensor
2006 (English)In: Proceedings of the SPIE - Optical Interactions with Tissue and Cells XVII, SPIE - International Society for Optical Engineering, 2006, Vol. 6084, 8-18 p.Conference paper (Other academic)
In a previous study, we presented a new technique for representationof the shape of a scattering surface. A sensor basedon two parallel fiber arrays yielded a source-detector intensity matrix(SDIM). In that study, it was shown that convex andconcave polyacetal plastic (Delrin) surfaces could be accurately distinguished usingthe proposed technique. A simplified simulation model for calculating theSDIM was used, assuming that backscattered light was generated byLambertian sources in the illuminated surface. These simulations showed discrepanciescompared to measurements, probably due to the absence of lightscattering in the model.Here, we will present an improved model,based on the Monte Carlo technique for light transport inturbid media. The optical properties of the Delrin phantoms wereestimated by means of different measurement techniques. The optical propertiesand the geometry of the Delrin phantoms were implemented inthe model along with the spatial distribution of the sourceand detector fibers of the sensor. The SDIM was extractedfrom backscattered photons exiting the turbid medium from the curvedsurface. The SDIM:s obtained with the Monte Carlo model, showeda much closer agreement with the measurements than those obtainedwith the Lambertian model. The small discrepancies observed are probablydue to spatially varying optical properties of the plastic phantoms.Measurements, using the previously described sensor, of the SDIM fromDelrin pieces with convex and concave surfaces, are compared tothe SDIM extracted from simulations using the Monte Carlo model.
Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2006. Vol. 6084, 8-18 p.
, Proceedings of SPIE (Progress in biomedical optics and imaging), ISSN 1605-7422 ; 6084
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-13010DOI: 10.1117/12.659550ISI: 000237158300002OAI: oai:DiVA.org:liu-13010DiVA: diva2:17660
Optical Interactions with Tissue and Cells XVII, 21 January 2006, San Jose, CA, USA