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Assessment of the effective attenuation coefficient of scattering media illuminated by a LED array : Effect of the beam size

hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorLE POMMELLEC, Jean-Yves
hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorPIRON, Vianney
dc.contributor.authorASKOURA, Mohamed-Lamine
hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorL'HUILLIER, Jean-Pierre
dc.date.accessioned2021-05-14T09:55:45Z
dc.date.available2021-05-14T09:55:45Z
dc.date.issued2015-06
dc.date.conference2015-06
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/77728
dc.descriptionThe 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.description.abstractEnThe 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.source.titleProc. SPIE 9542, Medical Laser Applications and Laser-Tissue Interactions
dc.subject.enTissue-optics
dc.subject.enDiffusion approximation
dc.subject.en2-D Fourier transform modelling
dc.subject.enEffective attenuation coefficient
dc.subject.enBeam size
dc.title.enAssessment of the effective attenuation coefficient of scattering media illuminated by a LED array : Effect of the beam size
dc.typeCommunication dans un congrès avec actes
dc.identifier.doi10.1117/12.2183433
dc.subject.halSciences de l'ingénieur [physics]/Optique / photonique
bordeaux.page1-8
bordeaux.volumeVII
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.issue954213
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.countryDE
bordeaux.title.proceedingEuropean Conferences on Biomedical Optics 2015
bordeaux.conference.cityMunich
bordeaux.peerReviewedoui
hal.identifierhal-01202046
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01202046v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Proc.%20SPIE%209542,%20Medical%20Laser%20Applications%20and%20Laser-Tissue%20Interactions&rft.date=2015-06&rft.volume=VII&rft.issue=954213&rft.spage=1-8&rft.epage=1-8&rft.au=LE%20POMMELLEC,%20Jean-Yves&PIRON,%20Vianney&ASKOURA,%20Mohamed-Lamine&L'HUILLIER,%20Jean-Pierre&rft.genre=proceeding


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