244 results about "Auto fluorescence" patented technology

This invention relates to methods for processing in vivo skin auto-fluorescence spectra for determining blood glucose levels. The invention also relates to methods of classifying cells or tissue samples or quantifying a component of a cell or tissue using a multivariate classification or quantification model.

The invention provides a device and process for real-time screening of areas that can be identified as suspicious either through image segmentation utilizing image processing techniques or through treatment with an exogenous fluorescent marker that selectively localizes in abnormal areas. If screening detects a suspicious area, then the invention allows acquiring of autofluorescence images at multiple selected narrow differentiating spectral bands so that a "virtual biopsy" can be obtained to differentiate abnormal areas from normal areas based on differentiating portions of autofluorescence spectra. Full spatial information is collected, but autofluorescence data is collected only at the selected narrow spectral bands, avoiding the collection of full spectral data, so that the speed of analysis is increased.

An endoscope having an optical guide that is optically coupled to a first broadband light source and a second laser light source that emits light at a wavelength in a range of 350 nm to 420 nm. The endoscope has an image sensor at a distal end and collects a reflectance image including red, green and blue components with the image sensor in response to illumination by said broadband light source. The image sensor also collects an autofluorescence image having a blue component, a green component and a red component. A processor processes the fluorescence image by determining a ratio of the fluorescence image and the reflectance image to provide a processed fluorescence image.

Methods and systems for detecting early stage dental caries and decays are provided. In particular, in an embodiment, laser-induced autofluorescence (AF) from multiple excitation wavelengths is obtained and analyzed. Endogenous fluorophores residing in the enamel naturally fluoresce when illuminated by wavelengths ranging from ultraviolet into the visible spectrum. The relative intensities of the AF emission changes between different excitation wavelengths when the enamel changes from healthy to demineralized. By taking a ratio of AF emission spectra integrals between different excitation wavelengths, a standard is created wherein changes in AF ratios within a tooth are quantified and serve as indicators of early stage enamel demineralization. The techniques described herein may be used in conjunction with a scanning fiber endoscope (SFE) to provide a reliable, safe and low-cost means for identifying dental caries or decays.

An electronic endoscope system, which is adapted to observe a fluorescence image of autofluorescence emitted from a body cavity wall irradiated with excitation light, includes a controller that controls a light source apparatus to alternately introduce either white light or excitation light into a light guide while taking a normal color image and the fluorescence image, and controls an image signal generating system to generate normal color image signals and fluorescence image signals. The controller further controls a display device to display a still fluorescence image in a first window defined on a displaying area thereof based on the fluorescence image signals which have been generated when a still image switch is turned ON during the time to take the fluorescence image, and simultaneously to display a moving normal color image in a second window defined on a displaying area thereof based on the normal color image signals generated every time the body cavity wall is intermittently illuminated with the white light, the first window being larger than the second window.

Methods for analyzing aromatic hydrocarbons dissolved in water are discussed. The methods include providing a substrate coated with a thin film layer of a material, wherein the material has a high affinity for at least one aromatic hydrocarbon, the material is substantially optically transparent, and the material has near-zero auto fluorescence, inserting the coated substrate directly into an environmental location including water, waiting for an exposure time permitting at least one aromatic hydrocarbon to absorb into the thin film layer, retrieving the coated substrate from the environmental location, removing any non-absorbed matter from the coated substrate, and performing fluorescence analysis on the coated substrate to detect aromatic hydrocarbons present in the thin film layer. Also methods for analyzing aromatic hydrocarbons dissolved in water contained in coated vessels are provided.

A fluorescence detecting system includes a stimulating light projector which projects onto an object part which has been dosed with a fluorescence agent first stimulating light in the exciting wavelength range of the fluorescence agent and second stimulating light which differs from the first stimulating light in the wavelength band and is in the exciting wavelength range of the auto-fluorescence material contained in the object part, and a fluorescence information obtainer which obtains the fluorescence from the fluorescence agent information based on the fluorescence from the fluorescence agent emitted from the object part in response to projection of the first stimulating light and the auto-fluorescence information based on the auto-fluorescence emitted from the object part in response to projection of the second stimulating light. The fluorescence agent is a fluorescence agent which does not emit fluorescence in response to projection of the second stimulating light.

Protein recognized by an antibody used as an active ingredient of an antibody medicine such as trastuzumab or an antibody used for targeting a target site of an active ingredient is highly accurately quantitatively determined by employing a quantitative tissue staining method of biological tissues, thereby providing a method for determining therapeutic effectiveness of a medicine containing such an antibody as a component. The effectiveness of a medicine containing an antibody as a component is determined by employing a tissue staining method comprising the steps of: labeling the antibody in the medicine containing an antibody as a component with a fluorescent material and contacting the thus fluorescence-labeled antibody with a tissue sample; obtaining a fluorescence image by irradiating, with excitation light, a tissue site contacted with the antibody; obtaining an autofluorescence image in the same field of view and at the same focus as in the fluorescence image in a close region on a shorter wavelength side or a longer wavelength side of an acquisition wavelength region of fluorescence emitted by the fluorescent material; obtaining a corrected fluorescence image by performing image processing for removing fluorescence brightness of the autofluorescence image from fluorescence brightness of the fluorescence image; counting the number of cells in the tissue site contacted with the antibody; measuring average fluorescence brightness per fluorescent particle; and calculating the number of fluorescent particles per cell.

The invention relates to a multi-spectrum auto fluorescence fault imaging reconstruction method based on single view, which belongs to the optical molecular imaging field. The method is based on the diffusivity equation model, considers the uneven characteristics of small animal body, and simultaneously also considers the spectrum and the practical application characteristics of the auto fluorescence light source. In order to achieve the purpose, the multi-spectrum auto fluorescence fault imaging reconstruction method based on single view comprises the flowing steps: firstly, data acquisition; secondly, the dispersing processing of finite element; thirdly, the optimization of the selection of the feasible light source zone; fourthly, the reconstruction of the light source. The method overcomes the defects that the reconstruction light source of the auto fluorescence fault imaging reconstruction method is inaccurate, the reconstruction speed is low, the real-time processing is not convenient, and error can exist during the multi-spectrum data acquisition.

The invention puts forward a finite-element reconstruction method for space weighting of auto-fluorescence imaging. The method uses a diffuse optical tomography (DOT) technique to precisely reconstruct optical parameters of main biological tissue. The method limits a possible real light-source region, and divides a whole reconstruction region into a light-source possible region and a light-source impossible region so as to improve the numerical stability and effectiveness of reconstruction problems and reduce the ill-conditioned property of BLT reconstruction problems. In order to avoid famous 'Inverse Crime' problems, the method adopts a Monte Carlo (MC) random method to simulate the process of transmitting light in the biological tissue. Then the invention puts forward a finite-element method based on a space-weighting unit and adopts a tolerant algorithm for linear constrained optimization problems to reconstruct light-source information.

Spherical, transparent silica gel particles with a high luminescence that are produced through the encapsulation of one or more different luminescent substances in a silica gel matrix. By varying the concentration of the luminescent substances and through the encapsulation of substances with different emission frequencies, the particles can be used as multiplex coding and marker systems in bioanalytics and diagnostics.

An endoscopic or microscopic apparatus for diagnosis by means of a light-induced reaction in biologic tissue "in vivo" which is created by a photo-amboceptor or by autofluorescence is provided. The inventive apparatus is characterized by the feature that at least one reference wavelength lambdar is provided which is longer by up to 2Deltalambda at maximum or smaller than the wavelength lambdas at the point of intersection.

The invention belongs to an auto-fluorescence molecule image system which comprises a camera bellows, a CCD camera lens control module, an image processing module, an interactive analysis module and a database module. A system factor corrected by an integrating sphere can be converted into a photon density in an interesting area by the system through a pixel value. The system can work after a temperature value of the CCD camera is set and locked. Firstly, the light source in the camera bellows is opened to shoot an outline of a target object, then the light source is closed to capture a fluorescence signal which projects the outline of the detected object, and the signal is superposed with the outline image. User can choose the interesting area by using a selecting tool so as to acquire a photon density value for performing scientific research. The system of the invention can provide a database function for the user to conveniently manage the data and preview the images. The system of the invention has the advantages of reasonable structure, obvious function, convenient operation, low cost, wide application in the field of researching the small animals in non-invasive biologic experiment.

A color translating UV microscope for research and clinical applications involving imaging of living or dynamic samples in real time and providing several novel techniques for image creation, optical sectioning, dynamic motion tracking and contrast enhancement comprises a light source emitting UV light, and visible and IR light if desired. This light is directed to the condenser via a means of selecting monochromatic, bandpass, shortpass, longpass or notch limited light. The condenser can be a brightfield, darkfield, phase contrast or DIC. The slide is mounted in a stage capable of high speed movements in the X, Y and Z dimensions. The microscope uses broadband, narrowband or monochromat optimized objectives to direct the image of the sample to an image intensifier or UV sensitive video system. When an image intensifier is used it is either followed by a video camera, or in the simple version, by a synchronized set of filters which translate the image to a color image and deliver it to an eyepiece for viewing by the microscopist. Between the objective and the image intensifier there can be a selection of static or dynamic switchable filters. The video camera, if used, produces an image which is digitized by an image capture board in a computer. The image is then reassembled by an overlay process called color translation and the computer uses a combination of feedback from the information in the image and operator control to perform various tasks such as optical sectioning and three dimensional reconstruction, coordination of the monochromater while collecting multiple images sets called image planes, tracking dynamic sample elements in three space, control of the environment of the slide including electric, magnetic, acoustic, temperature, pressure and light levels, color filters and optics, control for microscope mode switching between transmitted, reflected, fluorescent, Raman, scanning, confocal, area limited, autofluorescent, acousto-optical and other modes.

Mitigative and remedial approaches to reduction of autofluorescence background noise are applied in analytical systems that rely upon sensitive measurement of fluorescent signals from arrays of fluorescent signal sources. Such systems are for particular use in fluorescence based sequencing by incorporation systems that rely upon small numbers or individual fluorescent molecules in detecting incorporation of nucleotides in primer extension reactions. Systems and methods for analyzing highly multiplexed sample arrays using highly multiplexed, high-density optical systems to illuminate high-density sample arrays and/or provide detection and preferably confocal detection off signals emanating from such high-density arrays. Systems and methods are applied in a variety of different analytical operations, including analysis of biological and biochemical reactions, including nucleic acid synthesis and derivation of sequence information from such synthesis.

A harmonic generation microscopy employs a laser device that emits a laser beam having a predetermined wavelength that causes no autofluorescence in a biological sample and that, after excited, induces both the second and third harmonic waves. The laser beam is projected onto a sample and an observation beam from the sample is received. The observation beam is directed through a splitter to separate the second harmonic wave and the third harmonic wave both of which are then converted into corresponding electrical signals. The electrical signals are fed to a computer-based image processing equipment to form an image of the sample on the basis of the second and third harmonic waves.

The present invention relates to a spectroscopic imaging system using autofluorescence and reflectance images to diagnose tissue. A preferred embodiment of the invention uses a plurality of light sources to illuminate a tissue region to provide the fluorescence and reflectance images, respectively.

The present invention provides systems and methods for the spectroscopic determination of the physical characteristics of the tissue under observation by an autofluorescence or other endoscope without the requirement of contacting the tissue directly. The optical probe contained in the endoscope itself is passive and may be either built into the endoscope or positioned in a biopsy channel of same. The spectroscopic information, combined with other information provided by the endoscope such as total fluorescence, improves the sensitivity and specificity of the identification of precancerous or cancerous lesions.

The invention discloses an auto-fluorescence tomography re-establishing method based on a multiplier method. The auto-fluorescence tomography re-establishing method based on the multiplier method comprises the following steps of: carrying out discretization by using a finite element method diffusion equation, and establishing an optimization problem model without constraint conditions based on a penalty term of an L1 norm; obtaining a dual model of the optimization problem model without constraint conditions; establishing an augmentation lagrange function of the dual model; simplifying the maximum function of the augmentation lagrange function; solving the maximum value of the augmentation lagrange function by using a truncated-Newton algorithm; upgrading the target vector by using the gradient of the augmentation lagrange function as the steepest descent direction of a target vector; upgrading a penalty vector; and calculating an objective function value J(w), calculating k=k+1 if the ratio of the norm of J(w)k-J(w)(k-1) to the norm of Pai m being not smaller than t0l is real, and jumping to the step S4, otherwise, ending the calculation, wherein t0l is the convergence efficiency threshold value of the target function. The auto-fluorescence tomography re-establishing method provided by the invention can quickly obtain accurate and reliable light source distribution information within a large image-forming region, so that other parameters except from the regularization parameter can realize self-adaptive adjustment for improving the image-forming robustness.