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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21-30 订阅

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Phase and intensity information in a highly scattering medium with two absorbers using phased array spectroscopy: Theoretical study

Phase and intensity information in a highly scattering mediu...

引用

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

作者： Kang, Kyung A. Chance, Britton Johnson Research Foundation Department of Biochemistry and Biophysics University of Pennsylvania PhiladelphiaPA19104 United States

In this paper, phase and intensity information is predicted for a system consisting of two absorbers immersed in a highly scattering medium and two light sources (in- and anti-phased) with a single detector. Phase and intensity information in this 3-D system with absorbing boundaries is obtained by solving the photon diffusion equation by B-W-K technique, with proper boundary conditions. The capability of phased array to resolve two absorbers with a single detector is correlated with a geometric relationship among sources, a detector, and absorbers.

关键词： Sensors Phased arrays Light Phase shifts scattering Light scattering Modulation Absorption Phase measurement Spectroscopy

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SPECKLE PATTERN STATISTICS ANALYSIS IN HUMAN SKIN-STRUCTURE INVESTIGATIONS

SPECKLE PATTERN STATISTICS ANALYSIS IN HUMAN SKIN-STRUCTURE ...

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

作者： ZIMNYAKOV, DA LEPESTKIN, SA POLYAKOV, II TUCHIN, VV UTZ, SR BLAGONRAVOV MECH ENGN INST 410740 SARATOV RUSSIA

ISBN: (纸本)0819413496

One of the important methods for the biomedical objects structure investigations is the statistical analysis of the partially developed speckle patterns formed in the output plane of the coherent scanning microscope (CSM). By means of CSM the speckle intensity's statistical properties for the samples of the human epidermis strippings have been investigated. The strippings under testing were considered as random phase screens with an unknown correlation length and phase deviation; for such objects the computer simulation of the laser light diffraction has been carried out.

关键词： Skin Speckle Statistical analysis Speckle pattern Diffraction Microscopes Biological research scattering Spatial frequencies Microlens

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EXPERIMENTAL-STUDY OF SPATIAL-RESOLUTION FOR TIME-RESOLVED NEAR-INFRARED IMAGING

EXPERIMENTAL-STUDY OF SPATIAL-RESOLUTION FOR TIME-RESOLVED N...

引用

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

作者： CARSON, KJ WICKRAMASINGHE, YABD ROLFE, P KEELE UNIV N STAFFORDSHIRE HOSP NHS TRUST DEPT BIOMED ENGN & MED PHYS STOKE ON TRENT ST4 7QB ENGLAND

ISBN: (纸本)0819413496

A preliminary study into the spatial resolution that may be achieved for time resolved near infrared imaging through highly scattering media has been performed. The spatial resolution, for time gated images, has been investigated quantitatively by measuring the edge-spread function for scattering media of different properties and at different depths. Transmission scans of two absorbing rods, spaced by different distances, were used to qualitatively study the contrast obtained at different integration periods or using the measured mean time-of-flight. Both spatial resolution and contrast are improved as the time gating interval is reduced. However, for thick tissue sections it may not be possible to reduce the spatial resolution below about 10 mm, because of the small amount of light arriving at these early times.

关键词： Spatial resolution scattering Tissue optics Light scattering Near infrared photons Signal detection Absorption Modulation transfer functions Time metrology

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EXPERIMENTAL-STUDY OF CONTINUOUS-WAVE COHERENT TECHNIQUES FOR OPTICAL TRANSILLUMINATION

EXPERIMENTAL-STUDY OF CONTINUOUS-WAVE COHERENT TECHNIQUES FO...

引用

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

作者： SOMEKH, MG APPEL, RK MORGAN, S CROWE, JA UNIV NOTTINGHAM DEPT ELECT ENGN NOTTINGHAM NG7 2RD ENGLAND

ISBN: (纸本)0819413496

The paper investigates the imaging response of cw coherent systems for imaging through scattering media. Particular attention is paid to the confocal optical technique, and experimental results are presented that show the effect on the imaging spatial resolution as the optical configuration is altered. It is seen that if the scattering concentration is increased, there is a sudden reduction in spatial resolution. This point defines a so called transition region. We show how this transition region can be moved by altering the optical configuration. We also see that when heavily scattering media is being examined, it is possible to vary the optical configuration, what is in effect changing the optical response to various scattered components of light. This procedure can be likened to adjusting the time window in the pulsed time of flight technique, and is further investigated in the companion paper.

关键词： Light scattering Spatial resolution scattering Confocal microscopy scattering media Imaging systems Sensors Heterodyning Laser scattering

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INVERSE PROBLEMS IN SPECTROTURBIDIMETRY OF BIOLOGICAL DISPERSE SYSTEMS WITH RANDOM AND ORDERED PARTICLE ORIENTATION

INVERSE PROBLEMS IN SPECTROTURBIDIMETRY OF BIOLOGICAL DISPER...

引用

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

作者： SHCHYOGOLEV, SY KHLEBTSOV, NG BUNIN, VD SIROTA, AI BOGATYREV, VA RUSSIAN ACAD SCI INST BIOCHEM & PHYSIOL PLANTS & MICROORGANISMS SARATOV 410015 RUSSIA

ISBN: (纸本)0819413496

Several approaches to increasing the number of parameters of suspended particles that can be determined by a spectroturbidimetric method have been analyzed. It has been shown that, in principle, this problem can be solved invoking spectral characteristics obtained under conditions of complete or partial particle orientation in the stationary and relaxation regimes. Informative potentialities of combining the methods of electro-optics and spectroturbidimetry have been considered. It has been found that eventually for a given disperse system in situ, it is possible to obtain the following set of parameters: particle mean size, shape characteristic and refractive index, number and mass-volume concentration of particles, their total surface area per unit volume of the suspension and the effective value of particle surface polarizability.

关键词： Particles Refractive index Electro optics Inverse problems Light scattering Polarizability Phase shifts Spherical lenses Inverse optics Optical spheres

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Phase and intensity information in a highly-scattering medium with two absorbers using phased-array spectroscopy: theoretical study

Phase and intensity information in a highly-scattering mediu...

引用

quantification and localization using diffused photons in a highly scattering medium

作者： Kang, Kyung A. Chance, Britton Univ. of Pennsylvania Philadelphia PA USA

ISBN: (纸本)0819413496

关键词： Imaging techniques

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MEASUREMENT OF INNER-EAR BLOOD-FLOW BY LASER-DOPPLER FLOWMETRY - THE OPTICAL CHARACTERISTICS AND A FLOW MODEL STUDY OF THE INNER-EAR

MEASUREMENT OF INNER-EAR BLOOD-FLOW BY LASER-DOPPLER FLOWMET...

引用

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

作者： OKAMOTO, A OBERG, PA LINKOPING UNIV DEPT BIOMED ENGN S-58185 LINKOPING SWEDEN

ISBN: (纸本)0819413496

Laser Doppler flowmetry has widely been used to investigate the real time changes of the local blood flow in the inner ear. However the optical properties of the cochlea have not thoroughly been investigated. We have investigated the optical characteristics of the bony layer of the guinea pig cochlea by means of an integrating sphere and determined the absorption and scattering coefficients. A Delrin plate with approximately the same optical properties as the bony layer was used as a model in some of the measurements. In a flow model the geometrical conditions of the cochlea were studied. The flow model consists of a single capillary and the Doppler shifted signals were measured by a single optical fiber. Results show, the changes of the Doppler shifted signals were related to the distance between the photodetector and the scattering medium. From our results we can conclude that the laser Doppler measurements include information on the blood flow in structures deeper than 1 mm below the bone surface (guinea pigs).

关键词： Doppler effect Blood circulation Ear Bone Optical properties scattering Light scattering Photodetectors Absorption Capillaries

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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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quantification and localization using diffused photons in a highly scattering medium

作者： Bogoroditsky, Alexander G. Tuchin, Valery V. Saratov State Univ. Saratov 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： Tissue

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Determination of derivative hemoglobins concentration in a whole blood at multiple scattering light

Determination of derivative hemoglobins concentration in a w...

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quantification and localization using diffused photons in a highly scattering medium

作者： Khairullina, Alphiya Y. Naumenko, E.K. Inst. of Physics Minsk Belarus

ISBN: (纸本)0819413496

Following earlier deriving methods for determination of particle absorption coefficient K and the imaginary part of the refractive index we have been measuring diffuse reflection and relative transmittance of whole blood layers inner depth conditions in the spectral range 600 - 900 nm. The possibility of four derivative hemoglobin forms (oxy-, deoxy-, meth- and carboxy-) determination has been analyzed. The method is proposed for deriving the derivative hemoglobin forms by using the different spectral ranges.

关键词： Hemoglobin

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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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quantification and localization using diffused photons in a highly scattering medium

作者： Akchurin, Garif G. Ognischev, Andrew Y. Saratov State Univ. 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

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