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

共 31 条记录，以下是11-20 订阅

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THE DETERMINATION OF DERIVATIVE HEMOGLOBINS CONCENTRATION IN A WHOLE-BLOOD AT MULTIPLE-scattering LIGHT

THE DETERMINATION OF DERIVATIVE HEMOGLOBINS CONCENTRATION IN...

引用

conference on quantification and localization using diffuse photons in a highly scattering medium

作者： KHAIRULLINA, AJ NAUMENKO, EK ACAD SCI BELARUS INST PHYS MINSK 220602 BELARUS

ISBN: (纸本)0819413496

Followig earlier deriving methods of determination of particle absorption coefficient K and imaginary part of refractive index have been measuring diffuse reflection and relative transmittans of whole blood layers inder depth conditions in spectral range 600-900nm. The possibility of four derivative hemoglobin forms (oxy-, deoxy-, methand carboxy-) determination have been analyzed. The method is proposed for deriving of the derivative hemoglobin forms by using the different spectral ranges. Results of the said values determinations is well confirmed by traditional methods. © 1994 SPIE. All rights reserved.

关键词： Hemoglobin

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

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

引用

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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POTENTIALITIES OF LASER-DOPPLER MICROSCOPY IN BIOMEDICAL-RESEARCH

POTENTIALITIES OF LASER-DOPPLER MICROSCOPY IN BIOMEDICAL-RES...

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： PROSKURIN, SG PRIEZZHEV, AV LAPTEVA, NB MOSCOW MV LOMONOSOV STATE UNIV DEPT PHYS 119899 MOSCOW RUSSIA

ISBN: (纸本)0819413496

Laser Doppler (LD) microscopy is a technique providing local measurements of directed flow velocities and diffusion coefficients of cells, intracellular protoplasmic constituents, macromolecular aggregates, etc. In our group a computer- and video-aided sign-sensitive scanning laser Doppler microscope (LDM) has been designed, constructed and applied to the study of different biological objects. In this paper some new results are presented in connection with the development of LD microscopy.

关键词： Doppler effect Microscopy Particles Blood circulation Microscopes Diffusion Light scattering Medical research scattering Velocity measurements

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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...

引用

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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DETERMINATION OF TISSUE scattering DYNAMIC PARAMETER using A MODE-LOCKED LASER

DETERMINATION OF TISSUE SCATTERING DYNAMIC PARAMETER USING A...

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： AKCHURIN, GG OGNISCHEV, AY SARATOV NG CHERNYSHEVSKII STATE UNIV 410071 SARATOV RUSSIA

ISBN: (纸本)0819413496

A simple and sensitive method to determine tissue scattering dynamic parameters is presented. A mode-locked laser is used as an impulse radiation source. Amplitude and number of generation modes are connected to duration and shape of the pulse via Fourier transformation. Scattered optical signal, containing multiple scattering information, is broadened in comparison with incident pulse. Analysis of the output signal is performed by measuring spectral components on the frequencies of mode beating. This approach allows us to increase sensitivity.

关键词： Tissue optics Laser scattering scattering Laser tissue interaction Mode locking Diffusion Tissues Absorption In vivo imaging Picosecond phenomena

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STUDY OF NIR IMAGING RECONSTRUCTION ALGORITHM

STUDY OF NIR IMAGING RECONSTRUCTION ALGORITHM

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： ZHANG, K ROLFE, P WICKRAMASINGHE, YABD KEELE UNIV DEPT BIOMED ENGN & MED PHYS STOKE ON TRENT ST4 7QB ENGLAND

ISBN: (纸本)0819413496

Monte Carlo simulation technique is used to study photon migration in biological tissues. On a 36 mm diameter cylinder, temporal point spread function is simulated for each of the seven detectors around the model. Information such as mean-time-of-flight, differential pathlength factor, and detected photon number are recorded. Two back-projection algorithms have been proposed to reconstruct tomographic images of phantom.

关键词： Tissues Sensors Reconstruction algorithms Photon transport Monte Carlo methods scattering Algorithm development Detection and tracking algorithms Near infrared Photodetectors

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OBTAINING HIGH G-VALUES WITH LOW DEGREE EXPANSION OF THE PHASE-FUNCTION

OBTAINING HIGH G-VALUES WITH LOW DEGREE EXPANSION OF THE PHA...

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： RINZEMA, K TENBOSCH, JJ FERWERDA, HA HOENDERS, BJ UNIV GRONINGEN MAT TECH LAB 9713 AV GRONINGEN NETHERLANDS

ISBN: (纸本)0819413496

Analytic theory of anisotropic random flight requires the expansion of phase-functions in spherical harmonics. The number of terms should be limited while a g value should be obtained that is as high as possible. We describe how such a phase function can be constructed for a given number N of spherical components of the phasefunction, while obtaining a maximum value of the asymmetry parameter g.

关键词： scattering Spherical lenses Biological research Diffusion Tissues Adaptive optics Anisotropy Physics Silver

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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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LIGHT-DISTRIBUTION FROM ULTRASHORT LASER-PULSES IN TISSUE, A SIMULATION STUDY

LIGHT-DISTRIBUTION FROM ULTRASHORT LASER-PULSES IN TISSUE, A...

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： SCHMITT, HJ BLAZEK, V GAELINGS, E HABERLAND, U TECH UNIV AACHEN INST HIGH FREQUENCY TECH D-52056 AACHEN GERMANY

ISBN: (纸本)0819413496

For the study of light distribution in living tissue, a multi-layer simulation model of the skin was developed. This model assumes realistic anatomical topography data and includes different material parameters of the individual layers such as relative blood volume, absorption coefficient, scattering coefficient, and anisotropy scattering factors. The photon tracks were calculated with the Monte-Carlo-method. Preliminary results show the detectability of alien structures directly beneath the skin surface and in depths of up to several mm.

关键词： scattering Skin Sensors Tissue optics Tissues Signal detection Ultrafast phenomena Blood Light scattering Laser tissue interaction

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ANISOTROPIC AND SPECTRAL PROPERTIES OF BIOLOGICAL scattering OBJECTS WITH THE ORDERED PARTICLE ORIENTATION

ANISOTROPIC AND SPECTRAL PROPERTIES OF BIOLOGICAL SCATTERING...

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conference on quantification and localization using diffuse photons in a highly scattering medium

作者： KHLEBTSOV, N MELNIKOV, A SHCHYOGOLEV, S BOGATYREV, V SIROTA, A RAS INST BIOCHEM & PHYSIOL PLANTS & MICROORGANISMS SARATOV 410015 RUSSIA

ISBN: (纸本)0819413496

Particle orientation in a disperse medium results both in anisotropic properties and in the changes in spectral transmittancy. To determine theoretically the effects of such kind a general approach based on the joint use of both the equation of Brownian rotation diffusion and the Mueller matrix for a thin slab of anisotropic medium has been developed. The optical properties of scatterers are described in terms of the first and second Born approximation and the exact T-matrix method. The goal of the investigations is to develop adequate optical models for interpretation of the experimental data obtained for the ordered disperse systems. In this paper, anisotropic properties of oriented disperse systems are discussed in a review manner, while the orientational turbidimetric effect is considered in detail.

关键词： Particles scattering Phase shifts Dichroic materials Refractive index Birefringence Rayleigh scattering Diffraction Light scattering Polarization

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