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 26 for “"imaging resolution"”.
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Imaging Resolution of the 410-km and 660-km Discontinuities
… In this study, we investigate the resolution of receiver functions in imaging topographic variations of the 410-km and 660-km discontinuities based on wave propagation simulations using a Spectral Element Method (SEM). We investigate finite-frequency effects of direct P waves as …
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Photonic Crystal Enhanced-Fluorescence and Label -Free Bioimaging
… for predicting photonic crystal label-free imaging resolution based on resonance spectral characteristics. Devices are characterized by patterning a resolution standard onto the sensor using photolithography, and excellent design control over label-free imaging resolution is demonstrated. …
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Optical Metamaterials: Design, Characterization and Applications
… metamaterials, leading to subdiffraction resolution with optical imaging. Fabricating a smooth silver superlens (0.6nm root mean square roughness) with 15nm thickness, I demonstrate 30nm imaging resolution or 1/12th of the illumination wavelength (near-ultraviolet), far below the …
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Towards simultaneous single emission microscopy and magnetic resonance imaging
In recent years, the combined nuclear imaging and magnetic resonance imaging (MRI) has drawn extensive research effort. They can provide simultaneously acquired anatomical and functional information inside the human/small animal body in vivo. In this dissertation, the development of an ultrahigh …
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Expansion microscopy : improving imaging through uniform tissue expansion
… limited by diffraction and scattering, affecting imaging resolution and depth, respectively. Now, numerous methods are available to overcome each of these limitations, but sub-diffraction limited resolution imaging over large volumes of scattering tissue is still a challenge. This work concerns …
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Interaction Forces And Reaction Kinetics Of Ligand-Cell Receptor Systems Using Atomic Force Microscopy
… Force Microscopy (AFM) provides superior imaging resolution and the ability to measure forces at the nanoscale. It is an important tool for studying a wide range of bio-molecular samples from proteins, DNA to living cells. We developed AFM measurement procedures to measure protein …
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Scanning probe microscopy with inherent disturbance suppression using micromechanical systems
… in their environments which can limit their imaging resolution. This thesis introduces a general approach for suppressing out-of-plane disturbances that is applicable to non-contact and intermittent contact SPM imaging modes. In this approach, two distinct sensors simultaneously measure the …
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Enhanced visualization of retinal pathologies with ultrahigh resolution optical coherence tomography
… than sound waves. OCT can achieve a much higher resolution than ultrasound in measuring the underlying tissue microstructures. Another advantage of OCT is that it can achieve imaging in a non-contact and non-invasive manner. With typical axial resolution of 10 [mu]m, OCT already provides …
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Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition
… optical lattice experimental performance and imaging resolution power. Atoms are transported from the main chamber to the science chamber. By further evaporation cooling, BECs with N - 2-3 x 104 atoms are produced in a combination trap of two focused IR laser beams. High-resolution imaging was …
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Open-IRIS: Low Cost, Fully Open Source In-situ Infrared Inspection of Silicon
Short-Wave Infrared (SWIR) imaging has become a powerful and well-known technique over the last two decades for silicon inspection and imaging. Open-IRIS is a low-cost, fully open-source system for in-situ InfraRed Inspection of Silicon devices (IRIS). It is designed to lower the cost barrier for …
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Lens Fabrication by Accelerated Phase-Change for Mobile Multimodal Microscopic Imaging
… of personal computing that incorporate powerful imaging sensors, computational processing power, mobility, power, and networking in one portable package. By incorporating an add-on lens to a smartphone camera, microscopic imaging can be made possible. We introduce a lens-making technique by using …
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Investigations into Optically Controlled Phase Contrast, Polarisation Switchable Narrow Band RF Detection Techniques.
… into S-band microwave frequency phase-contrast imaging. Resolution is a critical issue so system enhancements such as optical remote connection and polarisation-dependant sensing have been implemented within an end-to-end sensing system. Initially, the feasibility of phase-contrast measurements …
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Development of Methodologies for the Solution of the Forward Problem in Magnetic-Field Tomography (MFT) Based on Magnetoencephalography (MEG)
… which are based on MRI (Magnetic Resonance Imaging) modality, are proved to be the most accurate among existing in terms of geometrical and material properties. Error estimations and algorithm structure delivers the resolution of the model to be the same as practical imaging resolution of …
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Synergistic Combination of Microwaves and Acoustic Signals: Towards Improved Breast Imaging
Microwave-based breast imaging techniques offer the convenience of frequently-repeated scans involving no breast compression, non-ionizing radiation, inexpensive scan costs, sensitivity to water content and low-complexity 3D image reconstruction. These benefits are well-suited for its application …
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Characterization of in vivo human skin in response to mechanical indentation using optical coherence tomography
… tomography (OCT) is an interferometry-based imaging modality that offers an imaging resolution (cellular level) that surpasses those of most standard clinical imaging tools and has shown to be able suitable for in vivo skin imaging. Therefore, this thesis investigates OCT-guided …
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Active Dynamic Analysis and Vibration Control of Gossamer Structures Using Smart Materials
… in diameter. With such huge structures in space, imaging resolution and communication transmissibility will correspondingly increase in orders of magnitude. A daunting problem facing gossamer spacecraft is their highly flexible nature. Previous attempts at ground testing have produced only …
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Technology Development for the Functional and Structural Analysis of the Brain
… protein detection, cell-labeling diversity, or imaging resolution. Using the zebrafish model, we propose a strategy for constructing a partial connectome of the fish larvae brain by optimizing a version of Brainbow, a method that stochastically labels cells. My work focuses on identifying …
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Scaling up 3D imaging, analysis, and culture of complex brain models
… summarizes a body of work aimed at scaling up 3D imaging, analysis, and tissue culture techniques for large-scale brain models We present a technique termed SWITCH that inhibits probe binding to allow for diffusion without the formation of a reaction front To improve imaging resolution, we present …
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Ultrasound-encoded optical tomography and time-reversed ultrasonically encoded optical focusing
… optical tomography is a developing hybrid imaging modality that combines high optical contrast and good ultrasonic resolution to image soft biological tissue. We developed a photorefractive crystal-based, time-resolved detection scheme with the use of a millisecond long ultrasound burst to …
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Deep learning for size-agnostic two-phase flow simulation with realistic pore structures and rock-fluid properties
… (CT) images and incorporates pixel size (i.e., imaging resolution), interfacial tension, contact angle (wettability), and capillary pressure as direct inputs. Leveraging these capabilities, I showcase several real-world applications of the trained models. First, I construct an extensive and …
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