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-re...
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.
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.
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 p...
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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.
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 pha...
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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.
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...
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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.
In this paper, phase and intensity information is predicted for a system consisting of two absorbers immersed in a highlyscatteringmedium and two light sources (in- and anti-phased) with a single detector. Phase and...
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In this paper, phase and intensity information is predicted for a system consisting of two absorbers immersed in a highlyscatteringmedium 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.
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...
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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.
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 ind...
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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 bend...
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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.
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 ou...
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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.
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