Bibliografie tematiche / SWIR imaging

Letteratura scientifica selezionata sul tema "SWIR imaging"

Autore: Grafiati

Pubblicato: 6 luglio 2024

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Articoli di riviste sul tema "SWIR imaging":

Carr, Jessica A., Daniel Franke, Justin R. Caram, Collin F. Perkinson, Mari Saif, Vasileios Askoxylakis, Meenal Datta et al. "Shortwave infrared fluorescence imaging with the clinically approved near-infrared dye indocyanine green". Proceedings of the National Academy of Sciences 115, n. 17 (6 aprile 2018): 4465–70. http://dx.doi.org/10.1073/pnas.1718917115.

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Fluorescence imaging is a method of real-time molecular tracking in vivo that has enabled many clinical technologies. Imaging in the shortwave IR (SWIR; 1,000–2,000 nm) promises higher contrast, sensitivity, and penetration depths compared with conventional visible and near-IR (NIR) fluorescence imaging. However, adoption of SWIR imaging in clinical settings has been limited, partially due to the absence of US Food and Drug Administration (FDA)-approved fluorophores with peak emission in the SWIR. Here, we show that commercially available NIR dyes, including the FDA-approved contrast agent indocyanine green (ICG), exhibit optical properties suitable for in vivo SWIR fluorescence imaging. Even though their emission spectra peak in the NIR, these dyes outperform commercial SWIR fluorophores and can be imaged in the SWIR, even beyond 1,500 nm. We show real-time fluorescence imaging using ICG at clinically relevant doses, including intravital microscopy, noninvasive imaging in blood and lymph vessels, and imaging of hepatobiliary clearance, and show increased contrast compared with NIR fluorescence imaging. Furthermore, we show tumor-targeted SWIR imaging with IRDye 800CW-labeled trastuzumab, an NIR dye being tested in multiple clinical trials. Our findings suggest that high-contrast SWIR fluorescence imaging can be implemented alongside existing imaging modalities by switching the detection of conventional NIR fluorescence systems from silicon-based NIR cameras to emerging indium gallium arsenide-based SWIR cameras. Using ICG in particular opens the possibility of translating SWIR fluorescence imaging to human clinical applications. Indeed, our findings suggest that emerging SWIR-fluorescent in vivo contrast agents should be benchmarked against the SWIR emission of ICG in blood.

Naczynski, Dominik Jan, Jason H. Stafford, Silvan Türkcan, Cesare Jenkins, Ai Leen Koh, Conroy Sun e Lei Xing. "Rare-Earth-Doped Nanoparticles for Short-Wave Infrared Fluorescence Bioimaging and Molecular Targeting of αVβ3-Expressing Tumors". Molecular Imaging 17 (1 gennaio 2018): 153601211879913. http://dx.doi.org/10.1177/1536012118799131.

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The use of short-wave infrared (SWIR) light for fluorescence bioimaging offers the advantage of reduced photon scattering and improved tissue penetration compared to traditional shorter wavelength imaging approaches. While several nanomaterials have been shown capable of generating SWIR emissions, rare-earth-doped nanoparticles (REs) have emerged as an exceptionally bright and biocompatible class of SWIR emitters. Here, we demonstrate SWIR imaging of REs for several applications, including lymphatic mapping, real-time monitoring of probe biodistribution, and molecular targeting of the αvβ3 integrin in a tumor model. We further quantified the resolution and depth penetration limits of SWIR light emitted by REs in a customized imaging unit engineered for SWIR imaging of live small animals. Our results indicate that SWIR light has broad utility for preclinical biomedical imaging and demonstrates the potential for molecular imaging using targeted REs.

Zhu, Yihua, e Daniel Fried. "Measurement of the Depth of Lesions on Proximal Surfaces with SWIR Multispectral Transillumination and Reflectance Imaging". Diagnostics 12, n. 3 (26 febbraio 2022): 597. http://dx.doi.org/10.3390/diagnostics12030597.

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The aim of this study was to compare the diagnostic performance of dual short-wavelength infrared (SWIR) transillumination and reflectance multispectral imaging devices for imaging interproximal lesions with radiography using extracted teeth that had been imaged with micro-computed tomography (microCT). Thirty-six extracted teeth with 67 lesions on the proximal surfaces were imaged using a newly fabricated SWIR multispectral proximal transillumination and reflectance imaging device along with an existing SWIR multispectral occlusal transillumination and reflectance device. The ability of SWIR imaging and radiography to detect lesions and accurately assess lesion dimensions were compared using microCT as a standard. Occlusal and proximal transillumination and occlusal reflectance performed best for imaging interproximal lesions while proximal reflectance was not useful for imaging interproximal lesions from tooth buccal and lingual surfaces. There was high correlation of the lesion dimensions measured in occlusal and proximal transillumination images compared to microCT and moderate correlation in occlusal reflectance images. The correlation between the lesion depth measured in radiographs and the lesion depth measured with microCT was not significant. This study demonstrates that SWIR occlusal and proximal transillumination and SWIR occlusal reflectance images are useful for imaging interproximal lesions and they provide more accurate measurements of lesion severity.

Thimsen, Elijah, Bryce Sadtler e Mikhail Y. Berezin. "Shortwave-infrared (SWIR) emitters for biological imaging: a review of challenges and opportunities". Nanophotonics 6, n. 5 (29 giugno 2017): 1043–54. http://dx.doi.org/10.1515/nanoph-2017-0039.

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AbstractShortwave infrared radiation (SWIR) is the portion of the electromagnetic spectrum from approximately 900 nm to 2500 nm. Recent advances in imaging systems have expanded the application of SWIR emitters from traditional fields in materials science to biomedical imaging, and the new detectors in SWIR opened an opportunity of deep tissue imaging. Achieving deep photon penetration while maintaining high resolution is one of the main objectives and challenges in bioimaging used for the investigation of diverse processes in living organisms. The application of SWIR emitters in biological settings is, however, hampered by low quantum efficiency. So far, photoluminescent properties in the SWIR region have not been improved by extending concepts that have been developed for the visible (400–650 nm) and near-infrared (NIR, 700–900 nm) wavelengths, which indicates that the governing behavior is fundamentally different in the SWIR. The focus of this minireview is to examine the mechanisms behind the low efficiency of SWIR emitters as well as to highlight the progress in their design for biological applications. Several common mechanisms will be considered in this review: (a) the effect of the energy gap between the excited and ground state on the quantum efficiency, (b) the coupling of the excited electronic states in SWIR emitters to vibrational states in the surrounding matrix, and (c) the role of environment in quenching the excited states. General strategies to improve the quantum yields for a diverse type of SWIR emitters will be also presented.

Zhu, Banghe, e Henry Jonathan. "A Review of Image Sensors Used in Near-Infrared and Shortwave Infrared Fluorescence Imaging". Sensors 24, n. 11 (30 maggio 2024): 3539. http://dx.doi.org/10.3390/s24113539.

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To translate near-infrared (NIR) and shortwave infrared (SWIR) fluorescence imaging into the clinic, the paired imaging device needs to detect trace doses of fluorescent imaging agents. Except for the filtration scheme and excitation light source, the image sensor used will finally determine the detection limitations of NIR and SWIR fluorescence imaging systems. In this review, we investigate the current state-of-the-art image sensors used in NIR and SWIR fluorescence imaging systems and discuss the advantages and limitations of their characteristics, such as readout architecture and noise factors. Finally, the imaging performance of these image sensors is evaluated and compared.

Zhu, Yihua, Chung Ng, Oanh Le, Yi-Ching Ho e Daniel Fried. "Diagnostic Performance of Multispectral SWIR Transillumination and Reflectance Imaging for Caries Detection". Diagnostics 13, n. 17 (31 agosto 2023): 2824. http://dx.doi.org/10.3390/diagnostics13172824.

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The aim of this clinical study was to compare the diagnostic performance of dual short wavelength infrared (SWIR) occlusal transillumination and reflectance multispectral imaging with conventional visual assessment and radiography for caries detection on premolars scheduled for extraction for orthodontics reasons. Polarized light microscopy (PLM) and micro-computed tomography (microCT) performed after tooth extraction were used as gold standards. The custom-fabricated imaging probe was 3D-printed and the imaging system employed a SWIR camera and fiber-optic light sources emitting light at 1300 nm for occlusal transillumination and 1600 nm for reflectance measurements. Teeth (n = 135) on 40 test subjects were imaged in vivo using the SWIR imaging prototype in the study and teeth were extracted after imaging. Our study demonstrates for the first time that near-simultaneous real-time transillumination and reflectance video can be successfully acquired for caries detection. Both SWIR imaging modalities had markedly higher sensitivity for lesions on proximal and occlusal surfaces compared to conventional methods (visual and radiographic). Reflectance imaging at 1600 nm had higher sensitivity and specificity than transillumination at 1300 nm. The combined SWIR methods yielded higher specificity but the combined sensitivity was lower than for each individual method.

Pavlović, Miloš S., Petar D. Milanović, Miloš S. Stanković, Dragana B. Perić, Ilija V. Popadić e Miroslav V. Perić. "Deep Learning Based SWIR Object Detection in Long-Range Surveillance Systems: An Automated Cross-Spectral Approach". Sensors 22, n. 7 (27 marzo 2022): 2562. http://dx.doi.org/10.3390/s22072562.

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SWIR imaging bears considerable advantages over visible-light (color) and thermal images in certain challenging propagation conditions. Thus, the SWIR imaging channel is frequently used in multi-spectral imaging systems (MSIS) for long-range surveillance in combination with color and thermal imaging to improve the probability of correct operation in various day, night and climate conditions. Integration of deep-learning (DL)-based real-time object detection in MSIS enables an increase in efficient utilization for complex long-range surveillance solutions such as border or critical assets control. Unfortunately, a lack of datasets for DL-based object detection models training for the SWIR channel limits their performance. To overcome this, by using the MSIS setting we propose a new cross-spectral automatic data annotation methodology for SWIR channel training dataset creation, in which the visible-light channel provides a source for detecting object types and bounding boxes which are then transformed to the SWIR channel. A mathematical image transformation that overcomes differences between the SWIR and color channel and their image distortion effects for various magnifications are explained in detail. With the proposed cross-spectral methodology, the goal of the paper is to improve object detection in SWIR images captured in challenging outdoor scenes. Experimental tests for two object types (cars and persons) using a state-of-the-art YOLOX model demonstrate that retraining with the proposed automatic cross-spectrally created SWIR image dataset significantly improves average detection precision. We achieved excellent improvements in detection performance in various variants of the YOLOX model (nano, tiny and x).

Xu, Heng, Jun Chen, Zhujun Feng, Kan Fu, Yusen Qiao, Zheng Zhang, Wenjin Wang et al. "Shortwave infrared fluorescence in vivo imaging of nerves for minimizing the risk of intraoperative nerve injury". Nanoscale 11, n. 42 (2019): 19736–41. http://dx.doi.org/10.1039/c9nr06066a.

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A novel nerve specific imaging agent based on SWIR QD-based in vivo imaging can markedly minimize the risk of iatrogenic nerve injuries during surgeries by providing real-time and long-time SWIR images of peripheral nerves in specific.

Lee, Jae Woong. "Trends in SWIR Imaging and Applications". Ceramist 21, n. 2 (30 giugno 2018): 171–86. http://dx.doi.org/10.31613/ceramist.2018.21.2.06.

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Salimi, Mohammadhossein, Majid Roshanfar, Nima Tabatabaei e Bobak Mosadegh. "Machine Learning-Assisted Short-Wave InfraRed (SWIR) Techniques for Biomedical Applications: Towards Personalized Medicine". Journal of Personalized Medicine 14, n. 1 (26 dicembre 2023): 33. http://dx.doi.org/10.3390/jpm14010033.

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Personalized medicine transforms healthcare by adapting interventions to individuals’ unique genetic, molecular, and clinical profiles. To maximize diagnostic and/or therapeutic efficacy, personalized medicine requires advanced imaging devices and sensors for accurate assessment and monitoring of individual patient conditions or responses to therapeutics. In the field of biomedical optics, short-wave infrared (SWIR) techniques offer an array of capabilities that hold promise to significantly enhance diagnostics, imaging, and therapeutic interventions. SWIR techniques provide in vivo information, which was previously inaccessible, by making use of its capacity to penetrate biological tissues with reduced attenuation and enable researchers and clinicians to delve deeper into anatomical structures, physiological processes, and molecular interactions. Combining SWIR techniques with machine learning (ML), which is a powerful tool for analyzing information, holds the potential to provide unprecedented accuracy for disease detection, precision in treatment guidance, and correlations of complex biological features, opening the way for the data-driven personalized medicine field. Despite numerous biomedical demonstrations that utilize cutting-edge SWIR techniques, the clinical potential of this approach has remained significantly underexplored. This paper demonstrates how the synergy between SWIR imaging and ML is reshaping biomedical research and clinical applications. As the paper showcases the growing significance of SWIR imaging techniques that are empowered by ML, it calls for continued collaboration between researchers, engineers, and clinicians to boost the translation of this technology into clinics, ultimately bridging the gap between cutting-edge technology and its potential for personalized medicine.

Più fonti

Tesi sul tema "SWIR imaging":

Brorsson, Andreas. "Compressive Sensing: Single Pixel SWIR Imaging of Natural Scenes". Thesis, Linköpings universitet, Datorseende, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-145363.

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Photos captured in the shortwave infrared (SWIR) spectrum are interesting in military applications because they are independent of what time of day the pic- ture is captured because the sun, moon, stars and night glow illuminate the earth with short-wave infrared radiation constantly. A major problem with today’s SWIR cameras is that they are very expensive to produce and hence not broadly available either within the military or to civilians. Using a relatively new tech- nology called compressive sensing (CS), enables a new type of camera with only a single pixel sensor in the sensor (a SPC). This new type of camera only needs a fraction of measurements relative to the number of pixels to be reconstructed and reduces the cost of a short-wave infrared camera with a factor of 20. The camera uses a micromirror array (DMD) to select which mirrors (pixels) to be measured in the scene, thus creating an underdetermined linear equation system that can be solved using the techniques described in CS to reconstruct the im- age. Given the new technology, it is in the Swedish Defence Research Agency (FOI) interest to evaluate the potential of a single pixel camera. With a SPC ar- chitecture developed by FOI, the goal of this thesis was to develop methods for sampling, reconstructing images and evaluating their quality. This thesis shows that structured random matrices and fast transforms have to be used to enable high resolution images and speed up the process of reconstructing images signifi- cantly. The evaluation of the images could be done with standard measurements associated with camera evaluation and showed that the camera can reproduce high resolution images with relative high image quality in daylight.

Ho, Chee Leong. "Imaging and reflectance spectroscopy for the evaluation of effective camouflage in the SWIR". Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FHo.pdf.

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Thesis (M.S. in Combat Systems Sciences and Technology)--Naval Postgraduate School, December 2007.
Thesis Advisor(s): Haegel, Nancy ; Karunasiri, Gamani. "December 2007." Description based on title screen as viewed on January 18, 2008. Includes bibliographical references (p. 65-67). Also available in print.

Oja, Martin, e Sebastian Olsson. "Stand-alone Dual Sensing Single Pixel Camera in SWIR". Thesis, Linköpings universitet, Fysik och elektroteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158206.

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A Single pixel camera is just that, a camera that uses only a single pixel to take images. Though, it is a bit more to it than just a pixel. It requires several components which will be explained in the thesis. For it to be viable it also needs the sampling technology Compressive sensing which compresses the data in the sampling stage, thus reducing the amount of data required to be sampled in order to reconstruct an image. This thesis will present the method of building an SPC with the required hardware and software. Different types of experiments, such as detection of small changes in a scene and different wavelength bands, has been conducted in order to test the performance and application areas for the SPC. The resulting system is able to produce images of resolutions up to 512x512 pixels. Disturbances such as movement in the scene or the camera itself being shaken became less of a problem with the addition of a second pixel. This thesis proves that an SPC is a viable technology with many different areas of application and it is a relatively cheap way of making a camera for the infrared spectrum.

Simon, Apolline A. "Décryptage des paramètres physico-chimiques critiques favorisant la diffusion efficace des nanoparticules dans des modèles tumoraux". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0046.

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La bio-imagerie d’environnements biologiques, complexes et hétérogènes utilisant des nanoparticules est uniquement pertinente si leurs propriétés intrinsèques et de surface sont contrôlées pour favoriser une diffusion en profondeur. En effet, la forme (rapports de forme, nanotubes, nanosphères), les dimensions (quelques nanomètres à quelques dizaines de nanomètres), les charges de surface et les interactions de surface avec le milieu environnant sont des paramètres décisifs. Ils régulent par exemple la mobilité et le devenir des nanoparticules à l’intérieur des milieux biologiques, dont par exemple les microenvironnements tumoraux. Dans cette thèse, nous nous sommes principalement concentrés sur les nanotubes de carbone, semi-conducteurs et à mono-parois dans le but d’adapter leur diffusion dans des environnements biologiques en contrôlant leurs propriétés de surface. Ce choix a été motivé car ces nanotubes présentent des atouts majeurs pour des applications en bio-imagerie. Leur longueur d’onde d’émission se trouve dans l’infrarouge court (SWIR), ce qui correspond à la deuxième fenêtre de transparence biologique. Ils sont également photostables et il a été prouvé qu’ils présentent une pénétration importante dans le tissu de par leur morphologie 1D. Pour étudier la mobilité des nanotubes dans des environnements complexes, nous avons suivi leurs trajectoires à l’échelle de la particule unique et appliqué les approches de microscopie de fluorescence à super-résolution. Nous avons tout d’abord détecté des modifications morphologiques associées à une fibrose à un stade précoce sur des tranches de foie de souris. Pour cela nous avons employé une stratégie de microscopie corrélative pour identifier l’environnement biologique in situ (noyaux et membranes des cellules) autour des nanotubes en plus de l’étude de leurs mobilités. Ce premier projet nous a motivé à explorer une deuxième stratégie pour disperser des nanotubes en augmentant leur brillance tout en conservant leur furtivité. Nous avons étudié de quelle manière le changement du coating autour du nanotubes (taille moléculaire du PEG ou présence d’une insaturation) impactait leur brillance et leur diffusivité. Cette diffusion a été testée sur différents modèles avec une hétérogénéité croissante allant du gel d’agarose à des extraits de matrice extracellulaire. Nous avons distingué deux tailles moléculaires de PEG découlant sur des dispersions compatibles à nos études. Enfin, dans le but d’étendre la bibliothèque de nanoparticules émettant dans le SWIR pour des applications de bio-imagerie, nous avons étudié un autre type de nanoobjets luminescents : des clusters d’or et des nanoparticules polymères chargées avec des clusters. L’analyse de leur luminescence ainsi que leur potentiel pour des études de suivi de particules uniques ont été évalués. L’analyse de clusters d’or uniques a été réalisée montrant une excellente brillance, mais uniquement dans un environnement sec. Par ailleurs, nous avons prouvé que les nanoparticules polymériques étaient détectables au niveau de la particule unique lorsqu’elles diffusaient dans un environnement aqueux ce qui fait d’elles d’excellentes candidates pour des applications de bio-imagerie
Bioimaging of complex and heterogeneous biological environments using nanoparticles is only relevant if one controls their intrinsic and surface properties to promote their diffusion in depth. Indeed, the shape (i.e. aspect ratios, nanotubes, nanospheres), the dimension (from a few nanometers up to a few tens of nanometers), the surface charges and the surface interactions with the surrounding environment are key parameters. They regulate for instance the mobility and the future of nanoparticles inside the biological milieu, such as tumoral microenvironments. In this PhD thesis, we mainly focused on semiconducting single-walled carbon nanotubes with the aim to tailor and apply their diffusion in bio-environments by controlling their surface properties. This choice was motivated by their exceptional advantages for bio-imaging applications. Their emission wavelength is in the short-wave infrared region (SWIR), which corresponds to the second window of biological transparency. In addition, they are photostable and it has been proved that they show a high tissue penetration ability due to their nanoscale 1D morphology. To study the mobility of nanotubes in complex environments, we tracked their trajectories at the single particle level and applied super-resolution fluorescence microscopy approaches. We first detected morphological modifications associated with early-stage fibrosis on murine liver slices. To that end, we employed a correlative microscopy strategy to identify the in situ biological environment (cell membranes and nuclei) surrounding the nanotubes in addition to the study of their mobilities. This first work motivated us to explore a second strategy to suspend the nanotubes to enhance their brightness while maintaining their stealth behaviours. We investigated how changing the coating around the nanotubes (PEG molecular size or presence of an insaturation) impacted their brightness and diffusivity. Diffusion has been tested within various models with growing complexity from an agarose gel to extracts of the extracellular matrix. We distinguished two molecular sizes of PEG rising to suspensions of nanotubes suitable for our studies. Finally, with the aim of expanding the library of SWIR-emitting nanoparticles for biological imaging, we investigated another type of luminescent nanoobjects: gold nanoclusters and polymeric nanoparticles loaded with such clusters. The analysis of their luminescence as well as their potential for single particle tracking were evaluated. Single gold cluster analysis has been conducted showing excellent brightness, but only in a dried environment. In addition, the polymeric nanoparticles were shown to be detectable at the single particle level diffusing within an aqueous media constituting promising candidates for bioimaging applications

Ruff, Edward Clark III. "Electro-Optic Range Signatures of Canonical Targets Using Direct Detection LIDAR". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1522922373060272.

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Walsh, Brendan. "Seismic signal processing for single well imaging applications". Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/9784.

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This thesis focuses on the concept of Single Well Imaging (SWI) in which a seismic source and receivers are deployed in a borehole to investigate the surrounding geology. The Uniwell project (1997-1999) was the first attempt to develop the SWI method; it used a fluid-coupled downhole source, which unfortunately generated high amplitude guided waves in the borehole which obscured all other useful information. Initial research work detailed in this thesis focused on removing the high amplitude guided waves, known as tube waves. Two-step source signature deconvolution using first the recorded source signature, and then the tube-wave reflected from the bottom of the well, succeeded in compressing the tube wave. The results were not consistent across all receivers, but there is enough correlation to identify a P-wave. Further work concentrates on using a new technique called Empirical Mode Decomposition to separate the tube-wave mode from the data. This identifies three dominant modes and a possible body wave arrival, but the results are ambiguous due to the inability of the decomposition to focus on the narrow bandwidth of interest. The source signature deconvolution technique can also be used to process real-time vertical seismic profiling (VSP) data down-hole, during pauses in drilling, in what is referred to as a Seismic-While-Drilling (SWD) setup. Results show that the technique is versatile and robust, giving 1 ms precision on first-break picking even in very noisy data. I also apply the technique to normal VSP data to improve both the resolution and the signal-to-noise ratio. A major effort in this thesis is to consider the effect of a clamped downhole source to overcome the tube-wave problem, using a magnetostrictive source. Earlier work established that the use of a reaction mass tended to excite resonances in the tool which caused the transducer to break. A new design for the source was developed in cooperation with colleagues which utilises a hydraulic amplifier design and a low power coded waveform driving method exploiting the time-bandwidth product to extract the signal from the noise. My results show that as the run time increases the resolution improves. With a run length of 80s it is possible to resolve the signal transmitted 50 cm through a granite formation. This analysis led to a revised design of the source to improve its efficiency. I have used finite difference modelling, with a variable grid technique, to compare an ideal explosive source with an ideal clamped source. The fluid-coupled source emits high amplitude tube waves which virtually obscure the body wave, whereas the clamped source emits a clearly identifiable P-wave along with lower amplitude tube waves. This clearly illustrates the advantage of an ideal clamped source. To model the source more accurately the idealwavelet is replaced by the respective recorded source signatures, and the data is then processed by cross correlation with the appropriate signature. The results show that the coded waveform approaches the resolution of the ideal wavelet very well, with all major events being visible. However, the fluid-coupled source performs very poorly with only the highest amplitude tube-wave visible. This work illustrates that by replacing a fluid-coupled source by a clamped source driven by a coded waveform, and by processing the data using cross correlation or signature deconvolution, it is possible to minimise or eliminate tube-wave noise from a SWI survey. It is hoped that the results outlined here will provide the basis for a new SWI method than can be used to prolong the supply of North Sea oil.

Heeger, Christof [Verfasser]. "Flashback investigations in a premixed swirl burner by high-speed laser imaging / Christof Heeger". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2012. http://d-nb.info/1106114701/34.

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Periagaram, Karthik Balasubramanian. "Determination of flame characteristics in a low swirl burner at gas turbine conditions through reaction zone imaging". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45828.

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This thesis explores the effects of operating parameters on the location and shape of lifted flames in a Low Swirl Burner (LSB). In addition, it details the development and analysis of a CH PLIF imaging system for visualizing flames in lean combustion systems. The LSB is studied at atmospheric pressure using LDV and CH PLIF. CH* chemiluminescence is used for high pressure flame imaging. A four-level model of the fluorescing CH system is developed to predict the signal intensity in hydrocarbon flames. Results from imaging an atmospheric pressure laminar flame are used to validate the behavior of the signal intensity as predicted by the model. The results show that the fluorescence signal is greatly reduced at high pressure due to the decreased number of CH molecules and the increased collisional quenching rate. This restricts the use of this technique to increasingly narrow equivalence ratio ranges at high pressures. The limitation is somewhat alleviated by increasing the preheat temperature of the reactant mixture. The signal levels from high hydrogen-content syngas mixtures doped with methane are found to be high enough to make CH PLIF a feasible diagnostic to study such flames. Finally, the model predicts that signal levels are unlikely to be significantly affected by the presence of strain in the flow field, as long as the flames are not close to extinction. The results from the LSB flame investigation reveal that combustor provides reasonably robust flame stabilization at low and moderate values of combustor pressure and reference velocities. However, at very high velocities and pressures, the balance between the reactant velocity and the turbulent flame speed shifts in favor of the former resulting in the flame moving downstream. The extent of this movement is small, but indicates a tendency towards blow off at higher pressures and velocities that may be encountered in real world gas turbine applications. There is an increased tendency of relatively fuel-rich flames to behave like attached flames at high pressure. These results raise interesting questions about turbulent combustion at high pressure as well as provide usable data to gas turbine combustor designers by highlighting potential problems.

Böttcher, Rene. "Differenzierung von ZNS-Läsionen der Enzephalomyelitis disseminata mittels suszeptibilitätsgewichteter Magnetresonanzbildgebung (SWI)". Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-223241.

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Die Magnetresonanztomographie stellt für die Detektion von zerebralen und spinalen Läsionen bei der Multiplen Sklerose die sensitivste bildgebende Methode dar und ist ein Instrument, die räumliche und zeitliche Dissemination der Erkrankung abbilden zu können. Die Spezifität des Verfahrens ist aber gering und die Applikation von MR-Kontrastmittel bei der Diagnostik zwingend notwendig. Bei der suszeptibilitätsgewichteten Magnetresonanzbildgebung (SWI) handelt sich um ein MR-Verfahren, das Schwankungen der magnetischen Suszeptibilität in der Gradientenechosequenz nutzt, um einen Bildkontrast zu erzeugen. Dadurch ist es möglich, hochaufgelöst und sensitiv Magnetfeldinhomogenitäten zu detektieren. In der vorliegenden prospektiven Studie wurden im Zeitraum von 2010 bis 2013 MRT-Untersuchungen unter Einschluss der suszeptibilitätsgewichteten Bildgebung in einem Kollektiv von 41 Patienten (33 weiblich, 8 männlich;; Durchschnittsalter 40 Jahre) mit gesicherter Multipler Sklerose und einem Vergleichskollektiv von 43 Patienten (28 weiblich, 15 männlich;; Durchschnittsalter 45 Jahre), bei denen weder bildgebend noch klinisch Hinweise auf eine Multiple Sklerose vorlagen, durchgeführt. Die Untersuchung wurde mit einem 1,5-Tesla-Magnetresonanz- tomographen realisiert. Das besondere wissenschaftliche Interesse galt dabei der „normal erscheinenden weißen Substanz“ (NAWM) und den zerebralen Läsionen. In der FLAIR-Sequenz wurden die MS-Läsionen und ROIs detektiert und markiert. Anschließend erfolgte die Übertragung in gleicher Schichthöhe auf die SWI-, T1w- und ADC-Sequenz. Zur Differenzierung von akuten und chronischen Läsionen erfolgte im Untersuchungsablauf die intravenöse Gabe von Gadolinium-DTPA- Kontrastmittel. Schon längere Zeit werden im wissenschaftlichen Diskurs krankheitsspezifische Veränderungen in der NAWM vor Auftreten der MS-Läsionen vermutet. Die Sensitivität der FLAIR-Sequenz ist aber scheinbar unzureichend. Mit der SWI- Bildgebung konnten statistisch signifikante SI-Unterschiede zwischen Referenz- und MS-Gruppe in der NAWM herausgearbeitet werden. Nach Kontrastmittelgabe wurden dabei keine Veränderungen der Signalintensität der NAWM in den beiden Gruppen festgestellt, was gegen die Hypothese einer primären Schrankenstörung in der Pathogenese der Erkrankung spricht. Insgesamt wurden 669 Läsionen identifiziert. Es folgte eine Differenzierung in 11 KM-aufnehmende (ACM-) Läsionen, 546 nicht KM-aufnehmende (NACM-) Läsionen und 112 „black holes“ (BLH). Eine gezielte Auswertung der Phasen- und Magnitudenbilder wurde nicht durchgeführt. Besonders in den KM-anreichernden Läsionen (ACM) sind bereits vor der KM-Gabe statistisch erhöhte Signalintensitäten in der SWI-Sequenz nachweisbar. Dies könnte theoretisch für den Nachweis akuter Läsionen, ohne dass eine KM-Gabe notwendig ist, genutzt werden. Doch ist die Anzahl dieser Läsionen in der Untersuchung zu gering, um verlässliche Aussagen diesbezüglich machen zu können. Dafür sind weitere Studien notwendig. Zusammenfassend betrachtet handelt es sich bei der SWI um ein hoch sensitives bildgebendes Verfahren, welches eine ausgezeichnete Differenzierung von ZNS- Läsionen ermöglicht und Veränderungen der NAWM bei der Enzephalomyelitis disseminata nachweisen kann. Es stellt somit eine sinnvolle Ergänzung zur konventionellen MS-Diagnostik dar und ist ein innovatives bildgebendes In-vivo- Verfahren zur weiteren Erforschung der Multiplen Sklerose.

Schröder, Nikolaus Christian [Verfasser], e Götz [Akademischer Betreuer] Thomalla. "Charakterisierung der Gefäßveränderungen bei zerebraler Ischämie mittels Susceptibility Weighted Imaging (SWI) / Nikolaus Christian Schröder ; Betreuer: Götz Thomalla". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1137323655/34.

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Libri sul tema "SWIR imaging":

Shipton, Paul. OXFORD READ AND IMAGINE 1 BENS BIG SWIM ACTIVITY BOOK. Oxford University Press, 2014.

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Capitoli di libri sul tema "SWIR imaging":

Brorsson, Andreas, Carl Brännlund, David Bergström e David Gustafsson. "Compressed Imaging at Long Range in SWIR". In Image Analysis, 115–27. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20205-7_10.

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Cohen, Yaniv, Ben Zion Dekel, Zafar Yuldashev e Nathan Blaunstein. "NIR-SWIR Spectroscopy and Imaging Techniques in Biomedical Applications—Experimental Results". In Intelligent Decision Technologies, 123–35. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3444-5_11.

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Fried, Daniel. "Use of optical clearing and index matching agents to enhance the imaging of caries, lesions, and internal structures in teeth using optical coherence tomography and SWIR imaging". In Handbook of Tissue Optical Clearing, 471–86. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003025252-30.

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Krupska-Wolas, Paulina, Anna Ryguła, Elżbieta Kuraś e Julio del Hoyo-Meléndez. "SWIR Reflectance Imaging Spectroscopy and Raman Spectroscopy Applied to the Investigation of Amber Heritage Objects: Case Study on the Amber Altar of the Lord’s Passion". In Lecture Notes in Mechanical Engineering, 401–16. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-17594-7_30.

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Ayaz, Muhammad, Alexander Boikov, Grant McAuley, Mathew Schrag, Daniel K. Kido, E. Mark Haacke e Wolff Kirsch. "Imaging Cerebral Microbleeds with SWI". In Susceptibility Weighted Imaging in MRI, 191–214. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470905203.ch12.

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Noseworthy, Michael D., Colm Boylan e Ali Fatemi-Ardekani. "Imaging Breast Calcification Using SWI". In Susceptibility Weighted Imaging in MRI, 319–28. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470905203.ch19.

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Lim, Tchoyoson, e Majda M. Thurnher. "Intracranial Infection and Inflammation". In IDKD Springer Series, 69–86. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-50675-8_6.

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Abstract (sommario):

AbstractAlthough uncommon compared to traumatic and cerebrovascular disease, radiologists should recognize the typical imaging features of meningitis, abscess, and encephalitis; and be aware of autoimmune mimics. DWI, SWI, and vessel wall imaging are useful advanced MRI techniques for problem-solving.

Kido, Daniel K., Jessica Tan, Steven Munson, Udochukwu E. Oyoyo e J. Paul Jacobson. "SWI Venographic Anatomy of the Cerebrum". In Susceptibility Weighted Imaging in MRI, 137–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470905203.ch9.

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Wycliffe, Nathaniel, Guangbin Wang, Masahiro Ida e Zhen Wu. "Imaging Ischemic Stroke and Hemorrhage with SWI". In Susceptibility Weighted Imaging in MRI, 215–34. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470905203.ch13.

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Rauscher, Alexander, e Stephan Witoszynskyj. "Processing Concepts and SWI Filtered Phase Images". In Susceptibility Weighted Imaging in MRI, 89–101. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470905203.ch6.

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Atti di convegni sul tema "SWIR imaging":

Petrov, Georgi I., e Vladislav V. Yakovlev. "Nonlinear SWIR imaging". In SPIE BiOS, a cura di Samuel Achilefu e Ramesh Raghavachari. SPIE, 2017. http://dx.doi.org/10.1117/12.2252897.

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Rafferty, Conor, Clifford King, Bryan Ackland, Jay O'Neill, Ingvar Aberg, T. S. Sriram, Angus Mackay e Robert Johnson. "Monolithic germanium SWIR imaging array". In 2008 IEEE Conference on Technologies for Homeland Security (THS '08). IEEE, 2008. http://dx.doi.org/10.1109/ths.2008.4534517.

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Allen, Jeffrey, David C. Dayton, John D. Gonglewski, Michael M. Myers e Rudolph Nolasco. "Seasonal hemispherical SWIR airglow imaging". In SPIE Optical Engineering + Applications, a cura di Jean J. Dolne, Thomas J. Karr, Victor L. Gamiz, Stanley Rogers e David P. Casasent. SPIE, 2011. http://dx.doi.org/10.1117/12.895455.

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Rafferty, Conor S., Clifford A. King, Bryan D. Ackland, Ingvar Aberg, T. S. Sriram e Jay H. O'Neill. "Monolithic germanium SWIR imaging array". In SPIE Defense and Security Symposium, a cura di Bjørn F. Andresen, Gabor F. Fulop e Paul R. Norton. SPIE, 2008. http://dx.doi.org/10.1117/12.782133.

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Weber, A., M. Benecke, J. Wendler, A. Sieck, D. Hübner, H. Figgemeier e R. Breiter. "Extended SWIR imaging sensors for hyperspectral imaging applications". In SPIE Commercial + Scientific Sensing and Imaging, a cura di Nibir K. Dhar e Achyut K. Dutta. SPIE, 2016. http://dx.doi.org/10.1117/12.2223737.

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Breiter, Rainer, Matthias Benecke, Detlef Eich, Heinrich Figgemeier, Holger Lutz, Alexander Sieck, Andreas Weber e Robert Wiegleb. "MCT SWIR modules for active imaging". In Infrared Technology and Applications XLV, a cura di Gabor F. Fulop, Charles M. Hanson e Bjørn F. Andresen. SPIE, 2019. http://dx.doi.org/10.1117/12.2519891.

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Shepherd, F. D., J. M. Mooney, T. E. Reeves, D. S. Franco, J. E. Murguia, C. Wong, P. Dumont et al. "SWIR variable dispersion spectral imaging sensor". In Photonic Devices + Applications, a cura di Randolph E. Longshore, Ashok K. Sood, Eustace L. Dereniak e John P. Hartke. SPIE, 2007. http://dx.doi.org/10.1117/12.740364.

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Neville, Robert A., R. Marois, Neil Rowlands e Ian P. Powell. "SFSI: the CCRS SWIR imaging spectrometer". In SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, a cura di Michael R. Descour e Jonathan M. Mooney. SPIE, 1996. http://dx.doi.org/10.1117/12.258084.

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Lin, Ziduo, Abdulkadir Yurt, Geert Vanmeerbeeck, Murali Jayapala, Zhenxiang Luo, Jiwon Lee, Joo Hyoung Kim, Pawel Malinowski e Andy Lambrechts. "VIS-SWIR wideband lens-free imaging". In Optics and Biophotonics in Low-Resource Settings VII, a cura di David Levitz e Aydogan Ozcan. SPIE, 2021. http://dx.doi.org/10.1117/12.2578857.

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Zeman, H. D., G. Lovhoiden e S. Ganesh. "Dual‐Wavelength NIR/SWIR Vein Imaging". In Frontiers in Optics. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/fio.2007.jwc17.

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Rapporti di organizzazioni sul tema "SWIR imaging":

Green, John, e Tim Robinson. Test Equipment and Method to Characterize a SWIR Digital Imaging System. Fort Belvoir, VA: Defense Technical Information Center, giugno 2014. http://dx.doi.org/10.21236/ada605295.

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Rudy, R. J., Y. Dotan, J. H. Hecht, D. J. Mabry, M. G. Sivjee e D. W. Warren. Design of a Low-Cost, Lightweight, Passively Cooled, Narrowband, SWIR Camera for Space-Based Imaging. Fort Belvoir, VA: Defense Technical Information Center, luglio 2003. http://dx.doi.org/10.21236/ada417112.

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Chiu, David Y., e Troy Alexander. Development of an Indium Gallium Arsenide (InGaAs) Short Wave Infrared (SWIR) Line Scan Imaging System. Fort Belvoir, VA: Defense Technical Information Center, settembre 2011. http://dx.doi.org/10.21236/ada549860.

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