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32 篇 会议

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检索条件"任意字段=Quantification and Localization Using Diffused Photons in a Highly Scattering Medium"

共 32 条记录，以下是1-10 订阅

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quantification and localization using diffused photons in a highly scattering medium

Quantification and Localization Using Diffused Photons in a ...

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quantification and localization using diffused photons in a highly scattering medium

This conference proceedings contain 38 papers. Topics on the quantification and localization of diffuse photons in highly difuse scattering media are covered, including: Imaging;Instrumentation and system parameters;S... 详细信息

ISBN: (纸本)0819413496

关键词： Tissue

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quantification and localization using Diffuse photons in a highly scattering medium

Quantification and Localization Using Diffuse Photons in a H...

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quantification and localization using Diffuse photons in a highly scattering medium 1993

The proceedings contain 38 papers. The topics discussed include: time-resolved breast transillumination: comparison of theoretical and experimental image-resolution;experimental study of spatial resolution for time-resolved near-infrared imaging;anisotropic and spectral properties of biological scattering objects with the ordered particle orientation;in vivo experimental technique for one-line absorption measurements in scattering biotissues;experimental study of continuous wave coherent techniques for optical transillumination;and optical transfer function and resolution of transillumination processes calculated by Monte Carlo simulations and diffusion theory.

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COMPUTER-SIMULATION OF LIGHT-PROPAGATION IN HOMOGENEOUS AND HETEROGENEOUS BIOTISSUES

COMPUTER-SIMULATION OF LIGHT-PROPAGATION IN HOMOGENEOUS AND ...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： PUSTOVALOV, VK BYELORUSSIAN STATE POLYTECH ACAD MINSK 220027 BELARUS

The computer simulation of light propagation in homogeneous and heterogeneous biotissues accounting for absorption and scattering radiation energy by pigmented granules and diffraction is made.

ISBN: (纸本)0819413496

The computer simulation of light propagation in homogeneous and heterogeneous biotissues accounting for absorption and scattering radiation energy by pigmented granules and diffraction is made.

关键词： Computer simulations Retina scattering Tissues Absorption Diffraction Cornea Eye Geometrical optics Particles

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TIME-RESOLVED TRANSILLUMINATION OF TURBID MEDIA

TIME-RESOLVED TRANSILLUMINATION OF TURBID MEDIA

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： MITIC, G KOLZER, J OTTO, J PLIES, E SOLKNER, G ZINTH, W SIEMENS AG CORP RES & DEV D-81739 MUNICH GERMANY

ISBN: (纸本)0819413496

The suitability and limits of time-resolved transillumination to determine inner details of biological tissues are investigated by phantom experiments. The achievable improvement is demonstrated by using different phantoms (absorbing objects embedded in a turbid medium). By means of line-scans across a sharp edge the spatial resolution and its dependence on temporal resolution can be determined. To demonstrate the physical resolution according to the Rayleigh-criterion, measurements were performed on blackened bead pairs. Investigations with partially transparent beads demonstrate the high sensitivity of time-resolving techniques with respect to variations in scattering or absorption coefficients.

关键词： scattering Spatial resolution Picosecond phenomena Absorption Light scattering Tissues photons Geometrical optics Temporal resolution

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WAVELENGTH DEPENDENCE OF LIGHT TRANSMISSION FOR BONE OF THE SKULL

WAVELENGTH DEPENDENCE OF LIGHT TRANSMISSION FOR BONE OF THE ...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： WIETLICKAPISZCZ, M MAZUR, R GRZEGORZEWSKI, B MED ACAD BYDGOSZCZ DEPT NEUROL PL-85092 BYDGOSZCZ POLAND

ISBN: (纸本)0819413496

The results of goniometric measurements of the intensity of laser light scattered by bone samples are presented. The experiment was performed on macerated, full-thickness skull samples. The angular dependencies of the intensity of laser light scattered by the samples was measured. The transmission of light through the samples was calculated and is shown as a function of sample thickness for various wavelengths of the incident radiation. The contribution of the fluorescent light in the scattered radiation is taken into account.

关键词： Light scattering Bone Skull Laser scattering scattering Tissues Photomultipliers Tissue optics Light wave propagation Optical filters

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DIFFusing WAVE SPECTROSCOPY

DIFFUSING WAVE SPECTROSCOPY

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： LLOYD, CJ PERKINS, E ATKINSON, T CARR, RJG CTR APPL MICROBIOL & RES DIV BIOTECHNOL MICROOPT GRP PORTON DOWN SP4 OJG WILTS ENGLAND

ISBN: (纸本)0819413496

A method of measuring the sphere equivalent hydrodynamic radius in highly concentrated suspensions is reported. Results showing the system to be concentration independent are given. The effects of polarization and the use of high birefringence fibers are discussed and shown to be important. The possibility of independence to fluid flow and the monitoring of the enhanced backscatter cone to given information on structure are considered. The equipment allows the use of a dip in probe and laser powers of only 1 mW are required.

关键词： Polarization Particles scattering Light scattering Sensors Diffusion Backscatter Laser scattering Spectroscopes Optical correlators

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PENETRATED IN BIOTISSUE LIGHT DETERMINATION FROM IN-VITRO MEASUREMENTS

PENETRATED IN BIOTISSUE LIGHT DETERMINATION FROM IN-VITRO ME...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： GRIMBLATOV, V ODESSA II MECHNIKOV STATE UNIV DEPT QUANTUM ELECTR ODESSA 270057 UKRAINE

ISBN: (纸本)0819413496

A model of the calculation of the diffuse reflection of the living tissue based on Kubelka-Munk theory is presented. The equation describing the relationship between backscattering of the living tissue and radiation parameters, inanimate tissue optical characteristics, and chromophores concentration is outlined. The use of the method in clinical dosimetry is given.

关键词： Tissue optics In vitro testing Blood scattering Tissues Absorption Laser therapeutics In vivo imaging Laser tissue interaction Organisms

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FLICKER SPECTROSCOPY OF ERYTHROCYTES - A COMPARATIVE-STUDY OF SEVERAL THEORETICAL-MODELS

FLICKER SPECTROSCOPY OF ERYTHROCYTES - A COMPARATIVE-STUDY O...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： KONONENKO, VL NN SEMENOV CHEM PHYS INST 117334 MOSCOW RUSSIA

ISBN: (纸本)0819413496

The theory of the frequency-domain optical flicker spectroscopy of erythrocytes is considered. The modified plane bending model of the flicker is developed. It takes into account the discrete spectrum of membrane bending modes; the influence of cell shape on the flicker spectrum; the viscosity of surrounding medium; and the distortion of the intrinsic shape of the flicker spectrum by the instrumental function of the measuring optical set-up. The results of two other (spherical) flicker models also are analyzed. The theory is compared with the flicker spectra measured from single human erythrocytes using two microphotometric techniques: the phase contrast and the backward laser light scattering.

关键词： Spherical lenses Spectroscopy Phase contrast Light scattering Laser scattering Microscopes Biomedical optics Ions Distortion Optical spectroscopy

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IN-VIVO EXPERIMENTAL-TECHNIQUE FOR ONE-LINE ABSORPTION-MEASUREMENTS IN scattering BIOTISSUES

IN-VIVO EXPERIMENTAL-TECHNIQUE FOR ONE-LINE ABSORPTION-MEASU...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： BOGORODITSKY, A TUCHIN, V SARATOV NG CHERNYSHEVSKII STATE UNIV DEPT PHYS SARATOV 410071 RUSSIA

ISBN: (纸本)0819413496

We have succeeded in working out a new way of making highly sensitive one-line absorption measurements. This technique is similar to the already known method where two intensity modulated lasers with different wavelengths are used. But some special processing of the informative signal makes it possible to distinguish the absorption from scattering and so to carry out the measurements with high accuracy. Full description of the designed technique and some experimental data obtained with the help of it are also given in this paper.

关键词： Absorption Phase shifts Sensors Signals intelligence scattering Data processing Semiconductor lasers Signal detection Signal processing In vivo imaging

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OPTICAL TRANSFER-FUNCTION AND RESOLUTION OF TRANSILLUMINATION PROCESSES CALCULATED BY MONTE-CARLO SIMULATIONS AND DIFFUSION-THEORY

OPTICAL TRANSFER-FUNCTION AND RESOLUTION OF TRANSILLUMINATIO...

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Conference on quantification and localization using Diffuse photons in a highly scattering medium

作者： PULVERMACHER, H SPIEGEL, F INST MED OPT D-80797 MUNICH GERMANY

ISBN: (纸本)0819413496

The point spread function of transillumination processes is deduced from diffusion theory using common perturbation techniques. It is shown that an unusual term proportional to the gradient of the absorption or scattering coefficient of the object usually may be neglected. For large scattering and small absorption coefficients diffusion theory and Monte Carlo simulation lead to the same resolution. Monte Carlo calculations predict a value of the modulation transfer function for spatial frequency 0, that is large than 1. This effect is experimentally confirmed. The resolution has a minimum at a certain value of the scattering coefficient and increases slowly beyond it. The resolution is improved, the contrast for large objects impaired by an increase of the absorption coefficient.

关键词： Absorption scattering Diffusion Optical transfer functions Monte Carlo methods photons Optical spheres Sensors Spatial frequencies Point spread functions

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