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 24 for “"volumetric imaging"”.
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Spiral 2D array designs for volumetric imaging
… are also used in underwater sonar and biomedical imaging. All applications require 2 dimensional (2D) arrays, capable of volumetric imaging, to further increase scan speed, and to allow tighter focussing on targets. However, 2D arrays have not found widespread use, mainly due to the large number …
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Speckle applications for volumetric imaging of biological dynamics
… randomness is often treated as noise in optical imaging. In another perspective, the speckle statistics can be exploited to extract information that is not readily accessible through conventional imaging techniques. This thesis describes the application of speckle in assisting imaging structure …
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Volumetric Imaging Across Spatiotemporal Scales in Biology with Fluorescence Microscopy
… sheet microscope capable of high-throughput imaging of cleared, macroscopic samples with cellular resolution. In light sheet microscopy, the combination of spatially confined illumination with widefield detection enables multi-megapixel acquisition in a single camera exposure. The …
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Advancing Fluorescence Microscopy Techniques for Volumetric Whole-cell Imaging
… the last decade has been the application of new imaging methods to modern biology, revealing new insights into cellular structure and dynamics. However, imaging methods capable of three-dimensional (3D) imaging at high spatial and temporal resolution are still lacking. This thesis describes two …
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The ray of hope : hidden work and the pursuit of accuracy
… exploration of the introduction and use of X-ray Volumetric Imaging (XVI) into radiotherapy practice in two locations, I show how processes of embedding this system and its uncertainties were managed. X-ray Volumetric Imaging, the focus of a number of fundraising campaigns in the mid 2000s, was …
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Development of Optical Coherence Tomography Systems for Ophthalmic Imaging and Intrasurgical Guidance
… coherence tomography (OCT) is a non-contact volumetric imaging modality that is well suited to image the anterior and posterior human eye in vivo. The success of OCT in clinical ophthalmology motivated the development of intraoperative OCT to overcome the limitations of the operating …
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Theoretical and Experimental Concepts to Increase the Performance of Structured Illumination Microscopy
… technique that excels in gentle live-cell volumetric imaging tasks. Many modalities of SIM were developed over the last decade that tailored SIM into the versatile and powerful technique that it is today. Nevertheless, the field of SIM continues to evolve and there is plenty of room for …
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Multi Array, Conformable Ultrasound Patch for Soft Tissue Imaging
Medical ultrasound imaging is a rapidly growing field due to its safety and affordability when compared to other imaging modalities such as MRI and X-Ray. Ultrasound transducers are made in various configurations from dense 2-D arrays for volumetric imaging to single element needle like transducers …
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Motion -Compensated 3-D Generalized Series Imaging
Three-dimensional magnetic resonance (MR) imaging is highly desirable from the standpoints of minimum voxel size, volumetric coverage and signal-to-noise efficiency. Unfortunately, long scan times have traditionally precluded the use of 3-D imaging in applications where simultaneous resolution of …
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A Two -Dimensional Amplitude -Steered Array for Real -Time Volumetric Acoustic Imaging
Real-time volumetric ultrasound imaging is difficult due to problems with array construction and due to the slow speed of data collection. In 1976, a linear amplitude-steered array was introduced that uses reduced electronics to steer a monofrequency beam. The current study examines how the linear …
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Discrete frequency chemical imaging with stimulated Raman scattering microscopy
Chemical imaging, the process of using chemically-specific label-free light-matter interactions as a contrast mechanism for imaging or microscopy, is a powerful set of tools for performing investigations where the distribution of chemical constituents within a specimen is of importance. This can …
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Light-sheet microscopy used for tracking particles
… the Year in 2014, allows fast, non-invasive 3D imaging across an entire organism. This works by decoupling illumination and detection such that the microscope only illuminates a thin section of tissue at a time. By scanning this light-sheet through an organism we can image in 3D, more quickly …
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3D Deep Learning Segmentation for Fiber Break Analysis of Carbon Fiber Reinforced Polymer Tomograms
… computed tomography allows for non-destructive, volumetric imaging of CFRPs under stress, enabling real-time 3D observation of the material’s failure. Due to the data-rich nature of the 3D scans at each time step, such experiments can result in thousands of 2D images per scan and multiple scans …
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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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Vortex Light Field Microscopy for 3D Spectral Single-Molecule Imaging
… localization microscopy (SMLM) is a powerful imaging technique that surpasses the diffraction limit and significantly improves spatial resolution over conventional light microscopy, allowing cellular structures and dynamic processes to be visualized at nanoscale. To solve the inherent …
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Light field microscopy for 3D imaging flow cytometry
… level requires technologies enabling high speed imaging and sample throughput. This has motivated the evolution of flow cytometry, which uses microfluidics to measure the fluorescence and scattering signals of thousands of cells per second, towards imaging flow cytometry, which allows spatial …
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Incorporating range uncertainty into proton therapy treatment planning
… individualisation. I have also used the daily volumetric imaging from patients previously treated with conventional radiotherapy to quantify range uncertainty from inter- and intra-fraction motion. These new methods of both quantifying and analysing the change in proton range in the patient can …
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Robust and Efficient AI-models for Medical Image Reconstruction, Segmentation, and Multimodal Knowledge Distillation
… annotated data, generalize across diverse imaging modalities and patient populations, function efficiently within computationally constrained environments, and remain robust against noise and adversarial perturbations. Overcoming these barriers requires moving beyond narrowly data-driven …
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Development and applications of high speed and hyperspectral nonlinear microscopy
… especially valuable for in vivo and live tissue imaging since it can provide both structural and functional information about tissues in their native environment. With the use of a range of exogenous dyes and intrinsic contrast, in vivo nonlinear microscopy can be used to characterize and measure …
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Non-contact quantitative imaging of limbs, bone and tissue, using ultrasound tomographic techniques
… sets collected on two custom built ultrasound imaging systems for limb imaging. The images are quantitative in that the distribution of sound speeds and dimensionally accurate geometry of tissue structures are reconstructed. The first imaging system is based on laser generation and detection of …
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