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dc.contributor.author
 hal.structure.identifier
LE POMMELLEC, Jean-Yves
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.author
 hal.structure.identifier
PIRON, Vianney
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorASKOURA, Mohamed Lamine
dc.contributor.author
 hal.structure.identifier
L'HUILLIER, Jean-Pierre
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.date.accessioned2015
dc.date.available2015
dc.date.issued2015
dc.date.submitted2015
dc.identifier.issn0277-786X
dc.identifier.urihttp://hdl.handle.net/10985/10054
dc.description.abstractThe knowledge of the light fluence rate distribution inside a biological tissue irradiated by a Laser (or LED) is fundamental to achieve medical treatments. In this paper, we present a semi-analytical model based on the 2-D Fourier Transform of the diffusion equation. This method can be applied to any irradiation source (cylindrically symmetric or not) at the surface of the tissue. Two particular beam shapes are studied: planar irradiation and flat beam with finite radius. The total fluence rate along the depth in tissues was computed by adding the collimated and the diffuse components. The analytical solution was also used to study the effect of the beam radius on the light attenuation. Measurements were performed using a tank filled with a liquid-simulating medium (Milk), illuminated with a LED array (660 nm, 100mm×100mm). Several circular diaphragms were used to obtain uniform circular beams with well defined radii. An optical fibre (with an isotropic tip) was used to measure the fluence rate inside the medium. Preliminary experimental results are in agreement with theoretical predictions.
dc.language.isoen
dc.publisherThe Society of Photo-Optical Instrumentation Engineers
dc.rightsPost-print
dc.subjectTissue-optics
dc.subjectDiffusion approximation
dc.subject2-D Fourier transform modelling
dc.subjectEffective attenuation coefficient
dc.subjectBeam size
dc.titleAssessment of the effective attenuation coefficient of scattering media illuminated by a LED array : Effect of the beam size
dc.identifier.doi10.1117/12.2183433
dc.typdocCommunication avec acte
dc.localisationCentre de Angers
dc.subject.halSciences de l'ingénieur: Optique / photonique
ensam.audienceInternationale
ensam.conference.titleEuropean Conferences on Biomedical Optics 2015
ensam.conference.date2015-06
ensam.countryAllemagne
ensam.title.proceedingProc. SPIE 9542, Medical Laser Applications and Laser-Tissue Interactions
ensam.page1-8
ensam.volumeVII
ensam.issue954213
ensam.cityMunich
hal.identifierhal-01202046
hal.version1
hal.statusaccept


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