Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"Near-Infrared Light"”.
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Experimental evaluation of near infrared light penetration into neural tissue
Near infrared (NIR) lasers find applications in medicine both for diagnostic and treatment purposes. Penetration depth into the tissue is a critical parameter to be considered in these NIR laser applications. Published data on the optical properties of rodent neural tissue are rare, despite the …
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Near infrared light to promote synaptic resilience to Alzheimer’s Disease neuropathology
… investigated the transcranial application of near infrared light (NIR, 600-1000 nm) as a potential treatment for AD. The primary objective of this project was to determine the effect of NIR light treatments (670 nm; 90 sec/day for 4 weeks) on the dysfunctional synaptic impact of oligomers. To …
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Near-Infrared Light Reduces Glia Activation and Modulates Neuroinflammation in Brain of Diet-Induced Obese Mice
… in turn may lead to dementia. In last years, near-infrared (NIR) light has been proposed as potential treatment, showing improvement of learning and memory in both humans and animal models. Previous work demonstrated that a transcranial delivery of NIR light reduced Aβ and Tau pathology and …
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Study of Plasmonic Properties of the Gold Nanorods in the Visible to Near Infrared Light Regime
… show unique plasmonic behavior in the visible to near-infrared light range. Gold nanostructures exhibit a particularly strong plasmonic response for these wavelengths of light. In this study we have investigated optical enhancement and absorption of gold nanorods with different thickness using …
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Imaging and spectroscopy of tissue-like phantoms using photon density waves: Theory and experiments
… scattering biological tissues using visible and near infrared light has been thwarted because of the inability to determine the absolute optical properties of thick tissues.
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Dynamic Digital Optical Tomography for Cancer Imaging and Therapy Monitoring
… is a non-invasive imaging technique that uses near-infrared light to create three-dimensional images of tissue. This dissertation presents the design and validation of an instrument for rapid optical imaging using digital detection techniques. In addition to a detailed description of the …
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Mapping cerebral blood flow with speckle contrast optical spectroscopy
… considered as an alternative approach to use near-infrared light to measure CBF non-invasively in humans. Several advancements in use of SCOS for CBF measurement are presented here. A data processing pipeline considering various noise sources and a pulsed laser setup were developed to account …
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Tikslinis fotovoltinių silicio prietaisų savybių keitimas, panaudojant gilų paviršiaus tekstūrinimą ir dvimatės medžiagos dangas /
… This allowed for a predictable variation of the light reflection from the semiconductor surface. The thesis also presented a method for forming large-area black silicon using two-step metal-assisted chemical etching. The dependencies of the light reflectance on technological parameters such as …
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Device for selecting lightwave ranges via computer control for studying building material properties via goniophotometer
… device for selecting specific visible and near-infrared light wavelengths related to the red, green, and blue sensitivity peaks of a visible detection camera and the pixel response for a near-infrared camera. This filter device functions in conjunction with the Department of Architecture's …
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Exploring The Translational Clinical Value of Cerebrovascular Reactivity Assessments by Diffuse Correlation Spectroscopy
… and portable optical tool that utilizes near-infrared light to assess cerebral hemodynamics (i.e., cerebral blood flow, cerebrovascular reactivity) at the microvascular length scale. The overall goal of this work is to explore and enhance the clinical value proposition DCS-mediated CVR …
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Nonlinear Microscopy for Materials Analysis and Clinical Pathology
… for analyzing material properties. Nonlinear microscopy (two-photon absorption fluorescence) was used to image surgical specimens in a clinical pathology practice. The optical system design of the instrument is explained, and its performance in terms of diagnostic accuracy …
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Magnetomotive optical coherence elastography for biomedical applications
… the imaging technique that MM-OCE is based on, near infrared light penetrates a few millimeters into highly scattering biological tissues and the backscattered light is detected in real time with interferometry. Post-processing of the optical signal renders structural images and displacement …
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Low-noise image sensor designed for near-infrared image-guided surgery
… X-ray, magnetic resonance imaging (MRI), and near-infrared (NIR) fluorescence are a few categories of medical imaging that are capable of gathering information from below the skin surface. NIR fluorescence imaging is very compatible with the needs of medical imaging. NIR imaging systems can be …
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Transillumination techniques in ophthalmic imaging
… in a reflection geometry. Images are formed from light that has backscattered off corneal microstructures or backreflected from the retina. In this configuration, artifacts caused by superficial surface reflections are often encountered. These unwanted reflections can either globally overwhelm the …
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Real-time Image Processing on an FPGA for an Intraoperative Goggle Device
The emergence of near-infrared dyes for fluorescence imaging has had a tremendous impact in the medical field. In particular, indocyanin green (ICG) has been widely used for assessing tumor margins during intraoperative procedures. Typically, the dye is intravenously injected into the patient, and …
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Clinical translation of optical coherence tomography for the diagnosis of otitis media: validation and tracking of biofilms on the tympanic membrane and development of a novel automated classification and diagnostic platform
… imaging modality that uses low-power near-infrared light to provide depth-resolved structural images of tissue, characterized and established normative bounds for in vivo acute and chronic OM infection states. While it is known that biofilms are present on the middle ear mucosa during …
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Endovascular Optical Coherence Tomography Imaging in Cerebrovascular Disease
… imaging modality available, utilizing near-infrared light with a wavelength of approximately 1300 nm and excellent spatial resolution of 10µm is achievable. With near histologic resolution, OCT has been described as an optical biopsy modality. The adoption of endovascular OCT imaging in …
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OPTICAL COHERENCE TOMOGRAPHY FOR NEUROSURGEY AND CANCER RESEARCH
… selective cancer cell necrosis after exposure to near infrared light both in vitro and in vivo. With novel algorithms that remove the bulk motion and track the vessel lumen automatically, OCT reveals dramatic hemodynamic changes during PIT and helps to elucidate the mechanisms behind the PIT …
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A Framework to Detect Presentation Attacks
… approach relies on capturing iris images using near infrared light. We train two classifiers to capture the area between the pupil and the cornea. The image of iris is then stored in the database. This approach generates a QR code from the iris. The code acts as a password (additional layer of …
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Time-domain diffuse correlation spectroscopy: instrument prototype, preliminary measurements, and theoretical modeling
Near-infrared spectroscopy (NIRS) is an emerging diffuse optical imaging tool with both clinical and academic applications such as functional brain imaging, breast cancer detection, and cerebral health monitoring. Due to its non-invasiveness, high spatial and temporal resolution, and portability, …
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