Relevant bibliographies by topics / Near infra-red spectroscopy (NIRS)

Academic literature on the topic 'Near infra-red spectroscopy (NIRS)'

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Published: 10 December 2022
Last updated: 19 February 2023

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Journal articles on the topic "Near infra-red spectroscopy (NIRS)"

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Richter, B., H. J. Hennes, C. Lott, D. F. Haniey, M. Windirsch, and W. Dick. "Early detection of intracerebral haemorrhage using near infra-red spectroscopy (NIRS)." European Journal of Emergency Medicine 5, no. 1 (March 1998): 110. http://dx.doi.org/10.1097/00063110-199803000-00052.

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Richter, B., H. J. Hennes, C. Lott, D. F. Haniey, M. Windirsch, and W. Dick. "Early detection of intracerebral haemorrhage using near infra-red spectroscopy (NIRS)." European Journal of Emergency Medicine 5, no. 1 (March 1998): 110. http://dx.doi.org/10.1097/00063110-199803000-00053.

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Fakhri, S., A. R. Moss, D. I. Givens, and E. Owen. "Prediction of in vitro gas production parameters of concentrate feeds by near infra-red reflectance spectroscopy (NIRS)." Proceedings of the British Society of Animal Science 1999 (1999): 155. http://dx.doi.org/10.1017/s1752756200003100.

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Herrero et al. (1996) found that NIRS was able to calibrate and cross-validate the static values of gas produced from the incubation of Kikuyu grass using manual in vitro gas production. However, the fermentation kinetic coefficients were not calibrated satisfactorily by NIRS. The aim of this study was to investigate the potential of NIRS as a means of predicting fermentation and the France et al. (1993) model parameters obtained from the automated in vitro gas production experiments for a range of concentrate feeds.Thirty-eight milled (1 mm) samples representing three typical concentrate feed types were scanned over the infra-red region covering 1100 to 2300 nm using an NIRS systems 6500 spectrometer. Optical data recorded as log 1/Reflectance were transformed to their standard normal variates and detrended values (SNV-D).
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Baker, C. W., and D. I. Givens. "The use of near infra-red reflectance spectroscopy (nirs) for the evaluation of forages. The application to undried silage." Proceedings of the British Society of Animal Production (1972) 1992 (March 1992): 221. http://dx.doi.org/10.1017/s0308229600023291.

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NIRS is now a familiar tool in the assessment of forage and feedingstuff quality. Recently NIRS has been applied to the direct prediction of in vivo organic matter digestibility (OMD) of grass silages (Barber et al 1990) and cereal straws (Givens et al 1991).The Agricultural Development and Advisory Service (ADAS) has been using NIRS to predict the in vivo OMD of oven dried silages on a routine basis since 1989, and it has proved to be reliable, accurate and rapid. In addition to OMD, crude protein (CP), and neutral detergent fibre (NDF), are routinely predicted by NIRS, leaving pH, ammonia, dry matter and ash still to be determined by wet chemistry methods.
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Bracht, Hendrik. "EVALUATING TISSUE PERFUSION WITH NEAR INFRA-RED SPECTROSCOPY (NIRS) IN DIFFERENT MODELS OF IMPAIRED PERFUSION." Shock 26, Supplement 1 (October 2006): 2–3. http://dx.doi.org/10.1097/00024382-200610001-00007.

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Khalifah, R. Craen, D. Bainbridge, S. Lownie, M. Quantz, and J. MacDonald. "The use of near-infra-red spectroscopy (NIRS) in surgical clipping of giant cerebral aneurysm." European Journal of Anaesthesiology 25, Supplement 43 (January 2008): 28. http://dx.doi.org/10.1097/00003643-200801001-00080.

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Passerotti, Michelle S., Thomas E. Helser, Irina M. Benson, Beverly K. Barnett, Joseph C. Ballenger, Walter J. Bubley, Marcel J. M. Reichert, and Joseph M. Quattro. "Age estimation of red snapper (Lutjanus campechanus) using FT-NIR spectroscopy: feasibility of application to production ageing for management." ICES Journal of Marine Science 77, no. 6 (August 8, 2020): 2144–56. http://dx.doi.org/10.1093/icesjms/fsaa131.

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Abstract Recent application of Fourier transform near infra-red spectroscopy (FT-NIRS) to predict age in fish otoliths has gained attention among fisheries managers as a potential alternative to costly production ageing of managed species. We assessed the age prediction capability of FT-NIRS scans in whole otoliths from red snapper, Lutjanus campechanus, collected from the US Gulf of Mexico and US Atlantic Ocean (South Atlantic). Otoliths were scanned with an FT-NIR spectrometer and resulting spectral signatures were regressed with traditionally estimated ages via partial least squares regression to produce calibration models, which were validated for predictive capability against test sets of otoliths. Calibration models successfully predicted age with R2 ranging 0.94–0.95, mean squared error ≤1.8 years, and bias <0.02 years. Percent agreement between FT-NIRS and traditional ages was lower than within-reader agreement for traditional estimates, but average percent error was similar and Kolmogorov–Smirnov tests were not significantly different (p ≥ 0.06) between traditional and FT-NIRS predicted ages for optimal calibration models. Ages >31 years were not well predicted, possibly due to light attenuation in the thickest otoliths. Our results suggest that FT-NIRS can improve efficiency in production ageing for fisheries management while maintaining data quality standards.
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Bain, Keryn F., Adriana Vergés, and Alistair G. B. Poore. "Using near infra red reflectance spectroscopy (NIRS) to quantify tissue composition in the seagrass Posidonia australis." Aquatic Botany 111 (November 2013): 66–70. http://dx.doi.org/10.1016/j.aquabot.2013.05.012.

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Khandaker, ZH, and ABM Khaleduzzaman. "Nutritional evaluation of Jambo forage using near infrared reflectance spectroscopy and comparison with wet chemistry analysis." Bangladesh Journal of Animal Science 40, no. 1-2 (May 28, 2012): 46–50. http://dx.doi.org/10.3329/bjas.v40i1-2.10790.

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A study was undertaken for the nutritional evaluation of Jambo forage by using Near Infrared Reflectance Spectroscopy (NIRS) and compare with the values obtained from wet chemistry analysis. Near infra-red reflectance spectrum of ground forage samples were obtained in duplicate (scanningnumber 32, resolution 8) with an FT-NIRS (Bruker, MPA, Germany) systems monochromator (700-2400 nm) using a Qurtz cup sampling device. For the development of local calibration equations, multivariate analysis was performed by a commercial analysis program Optical User Software (OPUS) and OpusLab to relate the spectral data and corresponding concentration values for each nutrient component of forage. The108 Jambo forage samples were collected from 108 cultivated experimental plots and groundthrough 2.0 mm screen for analysis the proximate components (Moisture, CP, CF, NFE and ash). The value for each component was placed into calibration group for NIRS equation development. The root mean square error of estimation (RMSEE) for the determination of CP, CF, NFE and total ash of Jambo forage was 0.33, 0.51, 1.14 and 0.39% respectively with correlation coefficient (r2) of 79.18, 82.04, 87.92 and 84.37 respectively. After cross validation, the root mean square error cross validation (RMSECV) for the CP, CF, NFE and total ash of Jambo forage were 0.37, 0.58, 1.41 and 0.48% respectively with correlation coefficient (r2) of 72.42, 73.85, 78.87 and 73.78 respectively. The mean predicted values of CP, CF, NFE and total ash by NIRS are close to the mean laboratory values determined by wet chemistry analysis. It can be concluded that NIRS could potentially be used to predict the nutritional quality of Jambo forage.DOI: http://dx.doi.org/10.3329/bjas.v40i1-2.10790Bang. J. Anim. Sci. 2011. 40 (1-2): 46-50
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Narbonneau, François, D. Kinet, Bernard Paquet, A. Depré, J. de Jonckheere, R. Logier, J. Zinke, Jens Witt, and Katerina Krebber. "Smart Textile Embedding Optical Fibre Sensors for Healthcare Monitoring during MRI." Advances in Science and Technology 60 (September 2008): 134–43. http://dx.doi.org/10.4028/www.scientific.net/ast.60.134.

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The potential impact of optical fibre sensors embedded into medical textiles for the continuous monitoring of the patient during Magnetic Resonance Imaging (MRI) is presented. In that way, we report on several pure optical sensing technologies for pulse oximetry and respiratory movements monitoring. The technique for pulse oximetry measurement is known as NIRS (Near Infra-Red Spectroscopy) in a reflectance mode. In parallel, we tested two different optical sensor based fabric designs breathing activity detection – a macro bending sensor and a fibre Bragg grating sensor consisting in respiratory frequency measurement by intensity variation detection and optical spectral analysis.
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Dissertations / Theses on the topic "Near infra-red spectroscopy (NIRS)"

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Firbank, Michael. "The design, calibration and usage of a solid scattering and absorbing phantom for near infra red spectroscopy." Thesis, University College London (University of London), 1994. http://discovery.ucl.ac.uk/1382004/.

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Following a review of methods for measuring the optical properties of tissue, the majority of this thesis is concerned with the design, construction, calibration and use of a solid, tissue equivalent phantom. The phantom material is a clear polyester plastic. This is obtained in unpolymerised form, scattering particles and absorbing dyes are added to it, and it is then polymerised to form a stable solid. Purely scattering and absorbing phantoms were made separately, and their optical properties were measured using a specially built system. This has a co-linear collimated light source and detector, and measures the unscattered light transmitted through a sample as a function of its thickness. Other methods of measuring the optical coefficients of tissue were tested with this phantom. One of these uses integrating spheres to measure the transmitted and reflected light from a sample. A model of light transport (in this case a Monte Carlo model) is used to convert these measurements into scattering and absorption coefficients. It was found that the measurement of scattering coefficient was reasonably accurate, but that the absorption coefficient was overestimated at the low values typical of tissue. A measurement of the optical properties of bone was made with this system. The other system investigated uses the diffusion theory to calculate optical properties from measurements made through a thick slab. The material was also employed to create a test phantom for near infrared spectroscopy machines. This provides a diffusing medium with an attenuation that is variable in discrete steps over three orders of magnitude. The relative attenuation between steps is totally wavelength independent. This phantom was adopted by the EC concerted action on near infrared spectroscopy and imaging. Finally, the phantom was used to create test objects with which to investigate the potential of imaging with infrared light.
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Zavala, Ortiz Daniel. "Application of in situ near infra-red spectroscopy (NIRS) for monitoring biopharmaceuticals production by cell cultures." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0040.

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La complexité des médicaments biopharmaceutiques implique que leur validation par les instances réglementaires nécessite un processus spécifique. Tout changement, notamment du procédé, nécessite une nouvelle validation en termes d’efficacité clinique et de sécurité pour le patient. Puisque les changements dans le procédé sont parfois inévitables, la qualité du produit n’a plus à être évaluée uniquement en fin de procédé de production (Quality by testing, QbT), mais tout au long du procédé, et conceptualisée dans toutes les étapes de fabrication (Quality by Design, QbD). Cette démarche préconise de contrôler les paramètres critiques du procédé (CPP) en temps réel afin de maintenir les attributs de qualité critiques (CQA) dans une zone de confiance préalablement définie. Cependant, la mise en œuvre du QbD est actuellement limitée dans l’industrie biopharmaceutique en raison de la complexité des procédés de culture cellulaire ainsi que par la nécessité d’utiliser des méthodes d’analyse multivariée de données issues des analyseurs du procédé (i.e. méthodes spectroscopiques). L’objectif de ce travail a dont été de développer de nouvelles applications méthodologiques et expérimentales, basées sur la spectroscopie proche infrarouge (NIR) in situ, pour le suivi en temps réel de cultures de cellules produisant des biopharmaceutiques. Pour cela, deux modèles cellulaires ont été étudiés : des cellules de hamster chinois (CHO) produisant un anticorps monoclonal (mAb) et des cellules de plantes (Cantharanthus roseus) produisant des molécules anticancéreuses (la vincristine, VC et la vinblastine, VB). Dans un premier temps, un procédé permettant la production de VC et de VB a été développé. La différentiation cellulaire de Catharanthus roseus ayant été identifiée comme un CPP, son suivi en ligne a été rendu possible grâce à l’utilisation combinée de la spectroscopie NIR et de modèles de calibration basés sur la régression des moindres carrés partiels (PLS). Dans un second temps, pour les cultures de cellules CHO, différentes techniques de régressions ont été évaluées pour générer des modèles de calibration permettant le suivi en ligne des CPP et des CQA. La régression PLS s’est révélée inadéquate en raison de la variabilité chimique et physique que les cellules CHO entrainent durant les différentes phases de culture. Au contraire, la régression LWR (Local Weighted Regression) a permis de suivre en temps réel des CPP conventionnels (concentration en glucose, en lactate, en cellules vivantes,…). Cette régression permet de gérer de manière adéquate la variabilité associée à la culture cellulaire. Cependant, pour le suivi du profil de glycosylation des anticorps (CQA), cette régression n’est pas capable de gérer les relations non-linéaires existantes entre les spectres NIR et les concentrations en diverses formes d’anticorps glycosylés. Ce suivi en ligne des différentes glycoformes a été rendu possible uniquement par l’utilisation de la régression SVR (Support Vector Regressions). Ainsi, ce travail a permis l’amélioration du suivi en ligne de CPP par la spectroscopie NIR, mais également le suivi de nouveaux CPP comme l’état physiologique de cellules de plantes ou encore les différentes glycoformes des anticorps
The complexity of biopharmaceutical products implies that their approval is based on a specific process. Any further change, especially in the process, requires drug validation in terms of clinical effects and biosecurity. Because changes in the processes may be unavoidable, quality assurance by inspection at the end of the process (Quality by Testing-QbT) tends to be replaced by a new quality perspective called Quality by design (QbD) which builds drug Critical Quality Attributes (CQA) controlling key Critical Process Parameters (CPP) in real-time. However, QbD implementation has been limited by the complexity of cell culture processes and the need for multivariate methods that allow the use of complex signals from process analyzers as monitoring instruments. Consequently, the objective of this work has been to develop new methodological and experimental applications, based on in situ NIR spectroscopy, for real-time monitoring of biopharmaceutical-producing cell cultures using two production platforms: animal cells (CHO-250-9) producing monoclonal antibodies (mAb) and plant cells (Cantharanthus roseus) producing antineoplastic molecules (vincristine-VC and vinblastine-VB). First, a process capable of producing VC and VB was generated, cell differentiation was identified as CPP and the ability to monitor it by in situ NIR spectroscopy was firstly demonstrated using calibration models based on partial least squares regression (PLSR). Subsequently in CHO cell cultures, different regression techniques were evaluated to generate calibration models to monitor CPP and CQA. PLSR was inadequate because of the chemical and physical variability that CHO cell cultures present during the different phases of batch culture. Local Weighted Regression (LWR) was adequate to monitor classic CPP (concentration of glucose, lactate, and viable cells, amongst others) since it adequately handled the variability associated with the progression of cell culture. However, for the glycosylation profile (CQA), it was unable to properly handle the complex nonlinear relationships between NIR spectra and the concentration of various monoclonal antibody (mAb) glycoforms. This was overcome with the use of models based on support vector regressions (SVR), allowing the generation of models of different mAb glycoforms related to particular clinical effects. Globally, this work has contributed to the expansion of the capabilities of in situ NIR spectroscopy for the monitoring of classic CPP in a more precise way, new innovative CPP such as cell physiological state in plant suspension cultures, and CQA such as mAb glycosylation profiles linked to clinical characteristics in animal cell cultures
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Dahl, Christian. "Determination of fossil share in combustion of waste : Development of a novel method using NIR spectroscopy to predict the content of plastics in RDF-material." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40050.

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Incineration of waste materials has become a common way to handle a worldwide increase of produced waste materials. The problem with waste as fuel is that the material is not homogeneous and include a mixture of fossils and renewables. The fossil part ends up in an emission of fossil carbon dioxide in a combustion process, which is included in the emissions trading system. However, since waste material varies a lot in composition depending on the time of the year, origins, etc. it is preferable to have a method for real-time measurement of the fossil share of combusted waste. No real-time measurement technologies are available today which is the reason to investigate if near-infrared (NIR) spectroscopy could be a potential solution. An artificial mixture of refused derived fuel has been used to investigate the possibilities of NIR for prediction of the fossil share in waste material. The fossil share is assumed to be equal to the content of plastic material with an origin of oil products. Mixtures with different plastic content are scanned by the NIR instrument to obtain individual absorption spectra. A Partial least square (PLS) regression model is created on measured spectra and known content of plastics. The best model for the prediction on new spectral data using one of four measured replicates is a PLS model preprocessed with Savitzky-Golay smoothing that gives an R-square value of 0,782. If the prediction is done, depending on a delimitated wavenumber interval and an average of all four replicates is the best model instead of a PLS model pre-processed with standard normal variate without seven outliers that have an R-square value of 0,81. R-square value is the coefficient of determination which has been used to figure out the best model. An R-square value above 0,65 are recommended for process modelling, where 1 is the highest possible value.
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Louw, Esme Denise. "Aroma profiles and non-destructive determination of quality parameters of Japanese plums (Prunus salicina Lindl.)." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6528.

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Thesis (PhD(Agric) (Horticulture))--University of Stellenbosch, 2011.
Includes bibliography.
ENGLISH ABSTRACT: Plums with good taste, aroma and eating quality lead to repeat purchases and sustained demand. Taste includes non-volatile compounds, e.g. sugars and acids, and has been well researched to meet the consumers’ preferences. Plum aroma, however, has not enjoyed the same attention. Limited literature is available on the aroma of Japanese plums and none could be found on the effects of relatively long cold storage on the profiles. The main aim of this study is to investigate the changes in aroma compounds of Japanese plums throughout maturation and ripening and the effects of commercial cold storage regimes. Near infra-red (NIR) spectroscopy was also evaluated as a non-destructive method to determine plum quality parameters aimed at minimising sample variability. In Paper 1, NIR spectroscopy was used to develop prediction models for total soluble solid (TSS), total acidity (TA), sugar-to-acid ratio, firmness and weight in three cultivars (Pioneer, Laetitia and Angeleno) and a multi-cultivar model. Samples were collected for seven consecutive weeks and repeated over two seasons. TSS results showed excellent predictability (R2 = 0.817-0.955; RMSEP= 0.453-0.610 % Brix) but the TA models did not perform well. The sugar-to-acid ratio models had results comparable to that of TSS. Both the firmness and weight models had acceptable results. The models of ‘Pioneer’ and ‘Laetitia’ had a better predictability capacity than the ‘Angeleno’ model. Although the multi-cultivar models outperformed the single cultivar models on R2 values it had higher prediction errors. The robustness of all the TSS, TA and firmness models is high in terms of seasonality, range and cultivar. Papers 2 and 3, the main focus of the study, are concerned with the aroma profile dynamics of Japanese plums. HS-SPME was used in both papers to extract the aroma compounds followed by GC-TOFMS for separation and identification. In Paper 2, the aroma volatile compounds of three cultivars (Pioneer, Laetitia and Angeleno) were determined for a seven week period including samples from three maturity stages (immature, harvest and tree-ripe). A total of 35 compounds were identified of which ten were generic. Each cultivar had five unique compounds resulting in different aroma profiles for each of the maturity stages and distinct separation patterns using discriminant analysis. The study was extended in Paper 3 where the aroma volatile compounds of six cultivars (Pioneer, Sapphire, Laetitia, Songold, Larry Anne and Angeleno) and one plumcot (Flavor King) were determined at three functional stages (commercial harvest, tree-ripe fruit and cold stored fruit). A total of 62 compounds were identified and classified into three groups (‘unique’ (31), ‘generic’ (11) and ‘frequent’ (20)) based on their frequency of occurrence. The aroma profiles of ‘Larry Anne’ and ‘Flavor King’ are the most affected by cold storage conditions and ‘Pioneer’ appears to be the least affected. All the cultivars have significantly different aroma profiles at all three of the functional stages with ‘Sapphire’, ‘Larry Anne’ and ‘Flavor King’ showing the largest differences. ‘Flavor King’, a plumcot, presented a ripe aroma profile that was much diverged from that of the true plums.
AFRIKAANSE OPSOMMING: Pruime met ‘n goeie smaak, aroma en eetkwaliteit lei tot herhaalde verkope en volhoubare aanvraag. Smaak sluit die nie-vlugtige stowwe (suikers en sure) in en is goed nagevors om die verbruikersvoorkeure te bevredig. Pruim aroma het egter nie dieselfde aandag geniet nie. Daar is beperkte literatuur beskikbaar wat handel oor die aroma van Japanese pruime en geen kon gevind word oor die effekte van lang koelopberging op die aromaprofiele nie. Die hoof doel van hierdie studie is om die veranderinge in die aromatiese komponente van Japanese pruime te ondersoek tydens die volwassewording- en rypwordingsprosesse asook die effekte van kommersiele koelopberging. Naby infrarooi (NIR) spektroskopie is ook geevalueer as ‘n nie-destruktiewe manier om pruim kwaliteitsparameters te bepaal met die doel om monstervariasie te beperk. In Artikel 1 is NIR spektroskopie gebruik om voorspellingsmodelle vir totale oplosbare suikers (TOS), totale suur (TS), suiker-tot-suur verhouding, fermheid en gewig te bepaal in drie kultivars (Pioneer, Laetitia en Angeleno) asook ‘n multi-kultivar model. Monsters is vir sewe opeenvolgende weke versamel en herhaal oor twee seisoene. TOS resultate toon uitstekende voorspelbaarheid (R2 = 0.817-0.955; RMSEP= 0.453-0.610 % Brix) maar TS modelle het egter nie so goed gevaar nie. Die suiker-tot-suur verhoudingsmodelle se resultate was vergelykbaar met die van TOS. Beide die fermheid- en gewigsmodelle het aanvaarbare resultate opgelewer. Die modelle vir ‘Pioneer’ en ‘Laetitia’ het ‘n beter voorspelbaarheidskapasiteit getoon as die van ‘Angeleno’. Alhoewel die multi-kultivar model beter presteer het as die enkel kultivar modelle op die R2-waardes was daar meer voorspellingsfoute. Hoe robuustheid is gevind i.t.v. seisoene, datagrense en kultivar vir al die TOS, TA en fermheidsmodelle. Artikels 2 en 3, die fokuspunt van die studie, handel oor die dinamika van die aromaprofiel van Japanese pruime. HS-SPME is in beide artikels gebruik on die aromatiese verbindings te ekstraeer gevolg deur GCTOFMS vir skeiding en identifikasie. In Artikel 2 is die aromatiese stowwe van drie kultivars (Pioneer, Laetitia en Angeleno) bepaal vir sewe opeenvolgende weke en sluit monsters van drie volwassenheidsstadiums in (onvolwasse, oes en boom-rypgemaakte pruime). ‘n Totaal van 35 verbindings is geidentifiseer waarvan tien as generies beskou kan word. Elke kultivar het vyf unieke komponente gehad en het gelei tot verskillende aromaprofiele vir elk van die volwassenheidsstadiums en diverse skeidingspatrone tydens die gebruik van diskriminant analise. Die studie is uitgebrei in Artikel 3 waartydens die aromatiese vlugtige stowwe van ses kultivars (Pioneer, Sapphire, Laetitia, Songold, Larry Anne en Angeleno) en een plumcot (Flavor King) bepaal is tydens drie funksionele stadiums (oes, boom-rypgemaak en koelopgebergde pruime). ‘n Totaal van 62 verbindings is geidentifiseer en in drie groepe geklassifiseer (‘uniek’ (31), ‘generies’(11) en ‘gereeld’ (20)) gebaseer op voorkomsfrekwensie. Die aromaprofiele van ‘Larry Anne’ en ‘Flavor King’ is die meeste deur die koelopberging geaffekteer en ‘Pioneer’ die minste. Al die kultivars het kenmerkend verskil t.o.v. hul aromaprofiele in al drie die funksionele groepe en ‘Sapphire’, ‘Larry Anne’ en ‘Flavor King’ het die grootste verskille getoon. ‘Flavor King’, die plumcot, het ook ‘n ryp aromaprofiel gehad wat baie van die van die egte pruime verskil het.
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Yoon, Weng Li. "Transferability of near infra-red spectra for the identification of pharmaceuticals." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311894.

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Hill, Samantha. "Near infra-red spectroscopy in a pediatric population undergoing cardiac surgery." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=94951.

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Abstract Background: Intraoperative Near Infra-Red Spectroscopy (NIRS) may reduce postoperative neurologic complications. Use in pediatric populations, NIRS increases, and variations in sensor placement are understudied. Objective: To explore NIRS performance in a pediatric population undergoing cardiac surgery; to describe significant (20%) NIRS deviations from baseline; to correlate events with physiologic variables; to examine the relevance of a second sensor. Methods: Retrospective review of prospectively collected NIRS data. Associations were assessed using Student's t-test, chi-squared test and logistic regression. Results: Significant deviations from baseline were common. Many occurred when unsupported by CPB (cardiopulmonary bypass) or upon CPB initiation. NIRS decreases and increases were significantly associated with PaO2, hematocrit, and MAP (mean arterial pressure) (p<0.05) and paCO2 (p<0.01), respectively. Unilateral deviations were frequent, particularly amongst cyanotic and male patients. Conclusion: In this population, significant NIRS deviations are associated with physiologic variables. A second sensor provided significant information.
Introduction: Le Near Infra-Red Spectroscopy (NIRS) utilitisé durant la période opératoire peut réduire les complications neurologiques postopératoires. L'utilisation du NIRS chez la population pédiatrique et les variations associées au placement des senseurs sont sous étudiées. Objectifs: Explorer les performances du NIRS chez les enfants lors de chirurgies cardiaques; décrire les variations significatives du NIRS (20%) en comparaison aux niveaux témoins; établir des corrélations entre les événements et les variables mesurées; établir l'utilité d'un second senseur. Méthodes: Une revue rétrospective de données NIRS obtenues de façon prospective. Les relations observées seront évaluées avec les tests Student-t, chi-squared, et de régression logistique. Résultats: Des variations significatives en comparaison aux valeurs témoins ont été observées. Plusieurs de ces variations ont eu lieu lorsque les patients n'étaient pas supportés par la circulation extracorporelle ou lors de son initiation. Les augmentations et diminutions du NIRS sont significativement reliées au PaO2, à l'hématocrite, à la pression artérielle moyenne (p<0.05) et au paCO2 (p<0.01), respectivement. Des variations unilatérales du NIRS sont fréquentes, particulièrement chez les patients cyanosés et chez les patients males. Conclusion: Chez cette population pédiatrique, des déviations significatives du NIRS sont associées à certaines variables physiologiques. Le deuxième senseur ajoute des informations utiles.
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Devendra, Kumar Vijaya Kumar. "The use of Near Infra-Red Spectroscopy to measure brain oxygenation in newborn." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509058.

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Mapekula, Nwabisa Nolwazi. "Quantitative evaluation of starch determination in feed samples using Near Infra-red Reflectance." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1015617.

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In an attempt to reduce the costs and turn around times experienced with outsourcing starch analysis in finished feed products, the company decided to invest in a NIR instrument to carry out such analyses in house. The particular instrument purchased by the company comes with a build in calibration for specific finished feed products and the main objective of this investigation was to evaluate whether the instrumentation and build in calibration gives reliable analyses of a finished poultry feed. The results obtained showed that : - The NIR results obtained have a positive bias compared to the theoretical (formulation specified value) and also to the value obtained by enzymatic starch analysis. - Despite the positive bias, the starch values were well within the allowable limits - Repeatability measurements on the data generated by two different analysts showed that while the percentage relative standard deviations obtained (< 1.0 percent) were well within the company specifications of percentage RSD < 5.0 percent, the inter sample repeatability showed small, but significant variation. - The results for intermediate precision showed that there is no statistically significant difference between the results obtained by two different analysts, nor was there any difference in the results of the same samples analysed at different time periods. - Reproducibility could not be evaluated due to the lack of another instrument within the company that were similarly set up as the instrument used for the investigation. This investigation has shown that, given the restrictions enforced by the build incalibration of the NIR instrument, the use of NIR for the analyses of the finished feed product is valid, but will require that careful attention be paid to data collection procedures.
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Rowlands, Anne Justine. "Applications of near infra-red Fourier transform Raman spectroscopy to photographic and allied chemistry." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387073.

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McGown, Anne Dora. "Assessment of cerebral oxygenation using near infra-red spectroscopy in obstructive sleep apnoea and chronic obstructive pulmonary disease." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445942/.

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This thesis describes a set of studies of the use of near infrared spectroscopy to measure cerebral oxygenation in obstructive sleep apnea (OSA) and chronic hypoxia. Cerebral oxygenation depends on cerebral blood flow and arterial oxygen saturation. The hypothesis underlying these studies was whether measurement of cerebral oxygenation using near infra-red spectroscopy (MRS) gives additional valid information compared to measuring arterial oxygen saturation alone. We also hypothesized that this technique could be used to assess overnight cerebral oxygenation in sleep studies. Our first validation study in 13 subjects with significant OS A showed that the fall in cerebral tissue saturation (measured as tissue oxygenation index, TO I) during sleep apnoea is related to arterial saturation (Sa02) (p=0.012), apnoea duration (p=0.001) and sleep stage (p<0.001) in a multiple regression in 1036 apnoeas. We also demonstrated changes in cerebral blood volume (range 0.41 - 0.09 ml/lOOg) and cytochrome oxidase oxidation state (range 0.48 - 0.13uM) occurring during apnoeas in 8 of these subjects. In a second validation study in 8 subjects we demonstrated correlations between changes in TOI and both arterial saturation (p=0.001), apnoea duration (p=0.001) and cerebral blood flow velocity (p=0.012) measured using carotid Doppler. We derived area under the curve (AUC) measures and dip rates for TOI and Sa02 during overnight studies and compared them to conventional polysomnographic measures, showing significant correlations of pretreatment apnoea hypopnoea index (AHI) with dip rates for both TOI and Sa02. AUC TOI correlations with pretreatment AHI were weak. Mean AUC for TOI was 339.4 (161-675) and mean AUC for Sa02 was 308.5 (89-944). Mean 4% Sa02 dip rate was 32.6 (1.5-90.6) and mean 4% TOI dip rate was 24 (0.1-95.7). Pilot studies were also carried out on 11 subjects with chronic obstructive pulmonary disease (COPD) during oxygen challenge. Calculated cerebral blood volume measurements varied from 1.51 ml/lOOg to 3.65 ml/lOOg. Changes in TOI in response to supplementary oxygen in patients with COPD and chronic hypoxia are related to both cerebral blood volume (p=0.001) and arterial saturation (p=0.001). The most important new findings in these studies are that cerebral blood flow changes appear to exacerbate rather than compensate for arterial hypoxia during sleep apnoea, and so it is plausible that TOI measurement (which picks up both Sa02 and cerebral blood flow velocity (CBFV) changes) may be more closely related to changes in neuropsychological function than pulse oximetry. The changes in cerebral oxygenation are profound enough to affect intracerebral redox state measured as cytochrome oxidase oxidation. Pilot work in COPD patients suggests that changes in cerebral blood volume affecting cerebral oxygenation occur during supplementary oxygen administration. NIRS provides a non-invasive method of measuring cerebral oxygenation suitable for use in sleep studies, and during oxygen administration.
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Books on the topic "Near infra-red spectroscopy (NIRS)"

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Near infra-red spectroscopy: Bridging the gap between data analysis and NIR applications. New York: E. Horwood, 1992.

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Hildrum, K. I. Near Infra-Red Spectroscopy. Ellis Horwood Ltd, 1993.

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Book chapters on the topic "Near infra-red spectroscopy (NIRS)"

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Horn, Svein Jarle, Einar Moen, and Kjetill Østgaard. "Direct determination of alginate content in brown algae by near infra-red (NIR) spectroscopy." In Sixteenth International Seaweed Symposium, 523–27. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4449-0_64.

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Pannu, Neesh, Xiaoyan Wen, John A. Kellum, John Fildes, N. Al-Subaie, Mark Hamilton, Susan M. Lareau, et al. "Near Infra-Red Spectroscopy." In Encyclopedia of Intensive Care Medicine, 1513–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_222.

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Oeseburg, Berend. "Tissue oxygenation-monitoring using Near Infra Red Spectroscopy." In Physiology And Pharmacology of Cardio-Respiratory Control, 25–31. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5129-0_4.

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Kerber, Florian, Gillian Nave, Craig J. Sansonetti, Gaspare Lo Curto, Paul Bristow, and Michael R. Rosa. "Establishing Wavelength Standards in the near Infra-red: Th-Ar." In Precision Spectroscopy in Astrophysics, 119–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75485-5_26.

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Walter, Bernd, R. Bauer, A. Krug, Th Derfuss, F. Traichel, and N. Sommer. "Simultaneous Measurement of Local Cortical Blood Flow and Tissue Oxygen Saturation by Near Infra-Red Laser Doppler Flowmetry and Remission Spectroscopy in the Pig Brain." In Intracranial Pressure and Brain Biochemical Monitoring, 197–99. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-6738-0_51.

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Badr, Ahmed. "Near Infra Red Spectroscopy." In Wide Spectra of Quality Control. InTech, 2011. http://dx.doi.org/10.5772/24208.

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Conference papers on the topic "Near infra-red spectroscopy (NIRS)"

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Williams, Phil. "Applications of Near-infra-red Spectroscopy (NIRS) without calibration." In 17th International Conference on Near Infrared Spectroscopy. Foz do Iguaçu - PR, Brazil: Galoa, 2015. http://dx.doi.org/10.17648/nir-2015-34283.

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Abdullah, Ahsan, Amir Hussain, and Imtiaz Hussain Khan. "Predicting Obesity Using Longitudinal Near Infra-Red Spectroscopy (NIRS) Data." In the International Conference. New York, New York, USA: ACM Press, 2017. http://dx.doi.org/10.1145/3093241.3093286.

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Chowdhry, Fatima, Andrea Gropman, Afrouz Anderson, Hadis Dashtestani, and Amir Gandjbakhche. "Near Infra-Red Spectroscopy (NIRS) in Urea Cycle Disorders and Typically Developing Children." In Optics and the Brain. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/brain.2018.bth2c.5.

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Guha, Avishek, and Ingmar Schoegl. "Limited View Tomography of Combustion Zones Using Tunable Diode Laser Absorption Spectroscopy: Simulation of an Algebraic Reconstruction Technique." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89507.

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Temperature and concentration distributions of a simulated flame were reconstructed with the help of computer tomography and tunable diode laser absorption spectroscopy (TDLAS). Reconstructions were based on the simulated numerical values of temperature and concentration of a stationary flame. Integrated absorption measurements along the line-of-sight (LOS) across the flames due to absorption by water vapor (H2O) in the near infra-red (NIR) region, specifically the 6930–6940 cm−1 range, were simulated to obtain the projection values for tomography. Spectroscopic parameters for the absorptions transitions, such as line-strengths, transition wavenumbers, collisional broadening coefficients and coefficients for their temperature dependency were selected from the HITRAN 2004 database. Simulated LOS data are inverted using a multiplicative algebraic reconstruction technique (MART), which are known to outperform traditional filtered back projection methods for cases with limited numbers of views. Based on spatially resolved reconstructions of spectroscopic data, temperature and concentration distributions are calculated using the wavelength modulation spectroscopy with second harmonic detection (WMS-2f) technique. A parametric study based on the number of views, orientation of views and number of rays per view required by the ART is performed in order to assess requirements for an acceptable reconstruction.
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Donnelly, Peter, and Miriam Fine-Goulden. "P62 A review of near infra-red spectroscopy." In Faculty of Paediatrics of the Royal College of Physicians of Ireland, 9th Europaediatrics Congress, 13–15 June, Dublin, Ireland 2019. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2019. http://dx.doi.org/10.1136/archdischild-2019-epa.417.

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Priya, B. Shenbaga, C. Kumaravelu, A. Gopal, and Pearley Stanley. "Classification of rice varieties using Near-Infra red Spectroscopy." In 2015 IEEE Technological Innovation in ICT for Agriculture and Rural Development (TIAR). IEEE, 2015. http://dx.doi.org/10.1109/tiar.2015.7358524.

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Priyoti, Anika Tabassum, Salman Jubair Jim, Sushmit Hossain, Shafkat Mahmud, Sujana Salvin, and Arnab Bhattacharjee. "Non-Invasive Blood Glucose Measurement Using Near Infra-Red Spectroscopy." In 2019 IEEE R10 Humanitarian Technology Conference (R10-HTC). IEEE, 2019. http://dx.doi.org/10.1109/r10-htc47129.2019.9042473.

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Seager, E., C. Longley, N. Aladangady, and J. Banerjee. "G212(P) Splanchnic near infra-red spectroscopy: a reliable clinical tool?" In Royal College of Paediatrics and Child Health, Abstracts of the RCPCH Conference and exhibition, 13–15 May 2019, ICC, Birmingham, Paediatrics: pathways to a brighter future. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2019. http://dx.doi.org/10.1136/archdischild-2019-rcpch.207.

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Krishnamoorthy, Shree, Ray Burke, Fergus McCarthy, and Stefan Andersson-Engels. "Beyond oxygen in-vivo long-wavelength near infra-red spectroscopy for hypoxia assessment." In Diffuse Optical Spectroscopy and Imaging VIII, edited by Davide Contini, Yoko Hoshi, and Thomas D. O'Sullivan. SPIE, 2021. http://dx.doi.org/10.1117/12.2615210.

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Endo, Maoka, Suguru Kanoga, and Yasue Mitsukura. "Visualization of happiness elicited taking a food using near infra-red spectroscopy." In 2016 8th International Conference on Information Technology and Electrical Engineering (ICITEE). IEEE, 2016. http://dx.doi.org/10.1109/iciteed.2016.7863291.

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Reports on the topic "Near infra-red spectroscopy (NIRS)"

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Freedman, Brett. Near Infra-Red Spectroscopy to Reduce the Phrophylactic Fasciotomies for and Missed Cases of Acute Compartment Syndrome in Solders Injured in OEF/OIF. Fort Belvoir, VA: Defense Technical Information Center, October 2011. http://dx.doi.org/10.21236/ada554294.

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