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Showing 1 to 20 of 84 for “"Reflectance spectroscopy"”.
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Diffuse reflectance spectroscopy of human colon tissue
Diffuse reflectance spectroscopy can provide quantitative biochemical and morphological information for the analysis of biological tissue epithelium and the detection of precancerous lesions. To investigate this, diffuse reflectance spectra were collected from adenomatous colon polyps (cancer …
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Forging asteroid-meteorite relationships through reflectance spectroscopy
… samples due to their significantly higher reflectance values with increasing wavelength. The only laboratory-simulated "weathering" process that reddens the spectra but does not significantly suppress the bands is alteration by laser irradiation, which is hoped to duplicate the effects of …
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Spatially-resolved reflectance spectroscopy with variable fiber geometry
… in tissue. Many optical modalities, including reflectance spectroscopy, use fiber optics as the means of light delivery and detection. However, the influence of fiber geometry on sampled optical spectra is not well understood. Since various configurations of fiber-optic probes may produce …
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Optical reflectance spectroscopy for cancer diagnosis : analysis and modeling
… and modeling of the signals from optical spectroscopy. This dissertation is motivated by the detection of oral cancer, but some of the methods developed can be generalized to epithelial cancers of other sites. Two main topics are covered in this dissertation: Analysis and Modeling. For …
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Reflectance spectroscopy for diagnosis of precancerous changes in human epithelium
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Intra-operative Assessment of Breast Tumor Margins Using Diffuse Reflectance Spectroscopy
… surgeon and pathologist. Quantitative diffuse reflectance (DR) spectral imaging has been shown to be a promising tool for interrogating tumor margins but patient and surgical factors have to be accounted for in order to fully exploit the discriminatory capability of the technology. The …
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Exploiting Optical Contrasts for Cervical Precancer Diagnosis via Diffuse Reflectance Spectroscopy
… sensor capable of collecting reliable diffuse reflectance data to extract quantitative optical contrasts for cervical cancer screening and diagnosis. </p><p> A scalable Monte Carlo based optical toolbox can be used to extract absorption and scattering contrasts from diffuse reflectance acquired …
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Revealing Refractory Materials on Trans-Neptunian Objects and Centaurs via Reflectance Spectroscopy
… runs at the ESOVery Large Telescope. The reflectance spectra of these minor planets were investigated to determine whether silicates and refractory organics, which are predicted to be present on their surfaces, could be directly detected via the presence of their characteristic absorption …
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Rapid identification of oil contaminated soils using visible near infrared diffuse reflectance spectroscopy
… and scanned using visible near-infrared diffuse reflectance spectroscopy (VisNIR DRS) at three combinations of moisture content and pretreatment. The VisNIR spectra of soil samples were used to predict total petroleum hydrocarbon (TPH) content using partial least squares (PLS) regression and …
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Raman spectroscopy and diffuse reflectance spectroscopy for diagnosis of human cancer and acanthosis nigricans
… there has been much interest in using Raman spectroscopy and diffuse reflectance spectroscopy as analytical optical spectroscopic methods for early diagnosis of diseases. Raman spectroscopy can be used to measure changes in the bio-molecular composition of a tissue specimen, and diffuse …
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Reflectance spectroscopy system for real time and non-invasive detection of transcutaneous bilirubin level
Blood bilirubin level would be elevated when one's liver is unable to remove bilirubin sufficiently from the blood. The conventional methods used for monitoring and measuring the bilirubin level are time consuming, tedious and invasive in nature. This study aims to investigate the feasibility of …
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Reflectance spectroscopy as a remote sensing technique for the identification of porphyry copper deposits.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Visible reflectance spectroscopy to observe the effect of copper embedded socks on erythema in feet
… associated with copper socks using a visible reflectance spectrometer in two randomized, double blind studies. Using the spectral data collected over the duration of the pilot study using a visible reflectance spectrometer, optical diffusion theory and knowledge of normal and pathological skin …
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Bridging the Modeling-Sampling Gap for Mid-Infrared Reflectance Spectroscopy of Small Particles, Films, and Fibers
… were studied using FT-IR reflection microspectroscopy; results show that absorption has a non-linear, stair-step-like dependence on particle coverage and a wavelength dependence that can be explained by electric field standing waves (EFSW) caused by the mirrored substrate.</p> <p>The same …
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Sensitivity of Diffuse Reflectance Spectroscopy to Dose- and Depth-dependent Changes in Tumor Oxygenation after Radiation Therapy
… efficiency. We hypothesize that diffuse reflectance spectroscopy (DRS) enabling repeated non-invasive measurements of tumor vascular oxygen saturation can provide surrogate measures of tumor oxygenation to predict tumor response to therapy. The goal of this study is to determine the …
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Application of Fecal Near Infrared Reflectance Spectroscopy and N-Alkane Labeled Supplementation Techniques to Predict Voluntary Intake in Beef Cattle
The objectives of this study were to evaluate the use of fecal NIRS profiling and the n-alkane labeled supplementation method for the prediction of voluntary intake in beef cattle for the identification of animals divergent in feed efficiency. Additionally, the use of fecal NIRS profiling …
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A real-time study of hydrogenated amorphous silicon, microcrystalline silicon, and amorphous silicon carbide growth by optically enhanced infrared reflectance spectroscopy
A new, optically enhanced reflection infrared spectroscopy technique is presented to study thin film growth in real time. Here, real time means under actual processing conditions, with a short data acquisition time compared to film changes or growth rates. This technique has industrial application …
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