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Proceedings of photon transport in highly scattering tissue

6-8 September 1994, Lille, France
  • 518 Pages
  • 4.77 MB
  • 2803 Downloads
  • English

SPIE--the International Society for Optical Engineering , Bellingham, Wash., USA
Photon transport theory -- Congresses, Light -- Scattering -- Congresses, Tissues -- Optical properties -- Congr
Other titlesPhoton transport in highly scattering tissue.
StatementSigrid Avrillier ... [et al.], chairs/editors ; sponsored by the Commission of the European Communities, Directorate General for Science, Research, and Development ... [et al.]
GenreCongresses.
SeriesProgress in biomedical optics, EurOpto series, SPIE proceedings series -- v. 2326., Proceedings of SPIE--the International Society for Optical Engineering -- v. 2326., Proceedings EurOpt series
ContributionsAvrillier, Sigrid., Commission of the European Communities. Directorate-General for Science, Research, and Development., Society of Photo-optical Instrumentation Engineers.
The Physical Object
Paginationix, 518 p. :
ID Numbers
Open LibraryOL19567748M
ISBN 100819416592
ISBN 139780819416599
LC Control Number94067402
OCLC/WorldCa32143437

Get this from a library. Proceedings of photon transport in highly scattering tissue: SeptemberLille, France. [Sigrid Avrillier; Commission of the European Communities. Directorate-General for Science, Research, and Development.; Society of Photo-optical Instrumentation Engineers.;]. Get this from a library.

Proceedings of photon transport in highly scattering tissue: SeptemberLille, France. [Sigrid Avrillier; Commission of the European Communities.

Directorate-General for Science, Research, and Development.; Society of Photo. Photon transport in scattering media, such as biological tissues, is generally modeled using the radiative transfer equation (RTE) due to its more accurate solution for highly scattering medium as in the case of brain tissues and higher computational efficiency for complex medium [35,36].

The tetrahedral mesh generated was converted into a CAD file and imported to : Mahasweta Bhattacharya, Anirban Dutta.

In two-photon fluorescence microscopy (TPM), near-infrared (NIR) light is used to excite transitions of twice the energy of a single photon.

One of the main advantages of TPM over conventional fluorescence imaging is that the NIR excitation light penetrates more deeply into tissue than the corresponding one-photon excitation by: Date Published: 31 January PDF: 10 pages Proc.

SPIEPhoton Transport in Highly Scattering Tissue, (31 January ); doi: / Show Author Affiliations Charlotta Lindquist, Lund Institute of Technology (Sweden) Roger Berg, Lund Institute of Technology (Sweden).

Photon transport in scattering media, such as biological tissues, is generally modeled using the radiative transfer equation (RTE) due to its more accurate solution for highly scattering medium as in the case of brain tissues and higher computational efficiency for complex medium [35,36].

The tetrahedral mesh generated was converted into a CAD. The use of infrared radiation in two-photon microscopy is critical for deep tissue imaging since tissue absorption and scattering coefficients for infrared light are much lower than for shorter.

PROCEEDINGS VOLUME Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation. Editor(s): Britton Chance; Robert R. Alfano *This item is only Glucose-induced changes in scattering and light transport in tissue-simulating phantoms Author(s).

Consumption of oxygen and blood flow during exercise and recovery phase evaluated by near-infrared spectroscopy and its relationship to skin forehead, quadriceps, tympanic, and rectal temperatures.

The diffusion approximation to the photon transport equation is the simplest model for photon migration. The applicability of the diffusion approximation, however, is limited.

For example, it is strictly valid only when the absorption coefficient is small compared to the scattering coefficient and the source modulation frequency is small compared to the scattering rate.

Basic principles and theoretical descriptions using radiation transfer theory or Monte Carlo (MC) simulation are considered. The propagation of short pulses and photon-density diffusion waves in scattering and absorbing media is analyzed, and the prospects of using these methods for tissue spectroscopy and tomography are discussed.

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Transcranial near-infrared stimulation (tNIRS) has been proposed as a tool to modulate cortical excitability. However, the underlying mechanisms are not clear where the heating effects on the brain tissue needs investigation due to increased near-infrared (NIR) absorption by water and fat.

Moreover, the risk of localized heating of tissues (including the skin) during optical stimulation of the.

Photon transport parameters of diffusive media with highly anisotropic scattering Article (PDF Available) in Physics in Medicine and Biology 49(13) August with 53 Reads. PROCEEDINGS VOLUME Ultrafast time-gated detection of translucent objects hidden in biological and highly scattering random media Author(s): Bidyut Baran Das; Imaging (NIRI) and quantitation (NIRS) in tissue using time-resolved spectrophotometry: the impact of statistically and dynamically variable optical path lengths.

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.

Besides, the diffusion approximation fails even qualitatively to describe angular dependence of the modulation and the phase shift of back scattered radiation. The photon migration process in tissue is also influenced by the finite (non-zero) life-time of photons in the virtually absorbed state during the scattering process.

Oxygen Transport to Tissue XXIII: Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, Photon Transport in Highly Scattering Tissue (Proceedings of SPIE, Vol.

By S Avrillier, B Chance, GJ Mueller, AV Priezzhev, and VV Tuchin (Editors). 31 January Multiple scattering in model systems: the polarization of scattered light observed in the H.

Schnorrenberg, M. Vonier, and Wolfgang Zinth "Multiple scattering in model systems: the polarization of scattered light observed in the forward direction", Proc. SPIEPhoton Transport in Highly Scattering Tissue, ( Analysis of photon transport in biological tissue and the subsequent heating effects Article (PDF Available) in International Journal of Thermal Sciences July with Reads.

Numerical calculation of photon migration in biological tissue using the radiative transfer equation (RTE) has attracted great interests in biomedical optics and imaging.

Because biological tissue is a highly forward-peaked scattering medium, a normalization of scattering phase function in the RTE is crucial. This paper proposes a simple way of normalizing the phase function by the double.

31 January Exact calculation of the intensity distribution at the boundary of an Bernhard J. Hoenders and W. Kamminga "Exact calculation of the intensity distribution at the boundary of an anisotropically scattering slab illuminated by a pencil beam", Proc.

SPIEPhoton Transport in Highly Scattering Tissue, ( Background: Elucidation of the highly forward scattering of photons in random media such as biological tissue is crucial for further developments of optical imaging using photon transport models.

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Details Proceedings of photon transport in highly scattering tissue EPUB

Moreover, if the scattering is substantial; the rate of the absorbed light intensity will be related to the heat source term as well as the photon fluence rate as (9) d I (r →, t) d t = v Q r (r →, t) = μ a v ϕ (r →, t), where (v = c/n) is the velocity of light inside the tissue and c.

Photon transport in scattering media, such as biological tissues, is generally modeled using the radiative transfer equation (RTE) [33] due to its more accurate solution for highly scattering medium as in the case of brain tissues [34] and higher computational efficiency for complex medium [35,36].

A Monte Carlo method for photon transport has gained wide popularity in biomedical optics for studying light behaviour in tissue. Nowadays, typical computation times range from a few minutes to hours. Although various implementations of the Monte Carlo algorithm exist, there is only a limited number of free software available.

In addition, these packages may require substantial learning efforts. Propagation of photon-density waves in strongly scattering media containing an absorbing semi-infinite plane bounded by a straight edge.

Journal of the Optical Society of America A, 10, – Gandjbakhche, A. H., Bonner, R.

Description Proceedings of photon transport in highly scattering tissue PDF

F., and Nossal, R. The Diffusion Theory is an approximation of the radiative transfer equation (RTE), and an analytical way to simulate photon transport.

As such, it has the ability to model photon propagation through tissue. At NIR wavelengths (photon migration is dominated by scattering: photons propagating through the tissue follow chaotic zigzag trajectories due to frequent scattering events (the mean free path between two subsequent scattering events is of the order of.

Diffuse Photon Density Wave Fields in Turbid Media and Tissue photon-density waves traveling through highly scattering tissue phantoms. Rayleigh scattering 3. The transport mean free. COVID Resources.

Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.Optical properties of biological tissues: a review light transport, and will focus on the expected optical properties of various tissue types, and of scatter, characterizes tissue scattering in terms of the relative forward versus backward direction of scatter.

Figure 1 summarizes these properties and their inter-relationships.Numerical diffusion modelling of interfering photon density waves for optical mammography Lindquist, C; Berg, Roger and Andersson-Engels, Stefan LU Conference on Photon Transport in Highly Scattering Tissue, LILLE, FRANCE, SEPp Mark.