Abstract:
A system and method to provide a diagnosis of the renal disease state of a test renal sample. A database containing a plurality of reference Raman data sets is provided where each reference Raman data set has an associated known renal sample and an associated known renal disease state. A test renal sample is irradiated with substantially monochromatic light to generate scattered photons resulting in a test Raman data set. The test Raman data set is compared to the plurality of reference Raman data sets using a chemometric technique. Based on the comparison, a diagnosis of a renal disease state of the test renal sample is provided. The renal disease state includes renal oncocytoma or chromophobe renal carcinoma disease state.
Abstract:
The invention provides a method for determining fuel quality and ethanol content. A mobile fuel analysis apparatus including a vehicle is provided. A database includes near-infrared spectra of standard fuel from a plurality of suppliers to establish correlation between quality parameter and the spectra of the oils. A near-infrared spectrometer is equipped on the vehicle and transported to a fuel distribution point. A near-infrared spectrum of a fuel sample is collected from the fuel distribution point. The collected spectrum is compared to the near-infrared spectra in the database, and converted into corresponding quality parameters.
Abstract:
Cross over (S560) in a genetic algorithm (128) is adapted for deriving an optimal mask (S540), or set of segments of a line. Each mask of a chromosome is subject to cross over with the respective mask of the other parent. Any overlapping part, whether a filtering (320) or pass-through part (350), is retained in the child (334) to preserve commonality. The part is preferably, potentially extended, according to one parent or the other, as decided pseudo-randomly (430). In a preferred application, spectrums of candidate blood constituents are masked for fitting to ensemble spectrums of test blood samples (S610, S620). The developed masks are applicable to constituent spectrums to create masked spectrums (S710) which are then applicable to an actual blood sample to be analyzed (S720).
Abstract:
A method is provided for characterizing a scientific material, such as a silicate material, a polymer material and/or nanomaterial. The method can include the steps of irradiating a measuring light of a predetermined wavelength range into material specimens, recording the measuring light reflected and/or reemitted by the material specimens, determining a ratio depending on the wave lengths of irradiated to detected measuring light (spectrum), and numerical-mathematical processing of spectral data of single material specimens for determining the characteristic features of the material specimens.
Abstract:
A method for analyzing a multi-channel chromatogram is realized for accurately resolving overlapping peaks on a multi-channel chromatogram to permit analysis of the composition of a sample. First, components of overlapping peaks are specified. A data matrix Dij is determined, and compressed in the wavelength direction to obtain a data matrix vector Di. Next, the two-dimensional data is deconvoluted, final standard deviation s0 is registered, and the deconvoluted two-dimensional data is reconvoluted to a retention intensity matrix. A quantitative spectral intensity matrix is computed, components are identified, and the identified components are quantified. Subsequently, an eigenvalue problem is solved, and the number n of components is estimated. The deconvolution and computation of the eigenvalue problem are iteratively executed until the peaks are isolated. Then, elution profiles are calculated, the components are identified, and the identified components are quantified.
Abstract:
Disclosed are apparatus and methods for quantifying fluorescent distribution within a surgery site of a patient in an operating room, wherein the surgery site has been exposed for a surgery procedure. Excitation light is provided at each of a plurality of positions at the surgery site in a method embodiment. The excitation light is significantly more intense than any other light sources that are present in the operating room. Fluorescent emission is detected from the surgery site in response to each of the excitation light positions so as to obtain a fluorescent emission image for each excitation light position. The fluorescent light distribution that is internal to a surface of the surgery site is quantified based on the obtained fluorescent emission images. In one aspect, the quantifying operation includes utilizing a structured light source to form a structured light grid over the surgery site surface to thereby obtain a three dimensional (3D) surface mesh of the surface of the surgery site based on the structured light grid.
Abstract:
The invention provides a method for determining fuel quality. A mobile fuel analysis apparatus comprising a vehicle is provided. A database comprises near-infrared spectra of standard fuel from a plurality of suppliers to establish correlation between quality parameter and the spectra of the oils. A near-infrared spectrometer is equipped on the vehicle and transported to a fuel distribution point. A near-infrared spectrum of a fuel sample is collected from the fuel distribution point. The collected spectrum is compared to the near-infrared spectra in the database, and converted into corresponding quality parameters.
Abstract:
A set of spectral data is collected from a mixture and corrected to remove instrumental artifacts. The collected mixture spectra define an n-dimensional data space, where n is the number of data points in the spectra. Principal component analysis (PCA) techniques are applied to the n-dimensional data space to generate and select a subset of m eigenvectors that effectively describe all variance in the original data space. The members of a spectral library of known, pure components are examined based on this reduced dimensionality data space using target factor testing techniques. Each library spectrum is represented as a vector in the m-dimensional reduced data space, and target factor testing results in an angle between the library vector and the data space for each spectral library member. Those spectral library members that have the smallest angles with the data space are considered to be potential members, or candidates, of the mixture and are submitted for further testing. The spectral library members are ranked and every combination of the top y members is considered as a potential solution to the composition of the mixture. A multivariate least-squares solution is then calculated using the mixture spectra for each of the candidate combinations. Finally, a ranking algorithm is applied to each combination and is used to select the combination that is most likely the set of pure components in the mixture.
Abstract:
The present invention is directed generally toward the field of spectral analysis and, more particularly, toward an improved method of identifying unknown components of a mixture from a set of spectra collected from the mixture using a spectral library including potential candidates. For example, the present method is directed to identifying components of a mixture by the steps which comprise obtaining a set of spectral data for the mixture that defines a mixture data space; ranking a plurality of library spectra of known elements according to their angle of projection into the mixture data space; calculating a corrected correlation coefficient for each combination of the top y ranked library spectra; and selecting the combination having the highest corrected correlation coefficient, wherein the known elements of the selected combination are identified as the components of the mixture.
Abstract:
An optical monitoring system for determining the constituents of a sample or specimen. An absorption spectrum is obtained from a sample and is passed through one or more filters having a specified absorption spectrum defined by a single atom or a compound. If the filter's absorption spectrum is included in the sample's absorption spectrum, then the sample contains that atom or compound. The apparatus includes a switching assembly that sequentially places one or more filters into the light path to determine if the subject atom or compound is contained in the sample.