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.
Results
Showing 1 to 20 of 36 for “"X-ray computed tomography (CT)"”.
-
A Manufacturing Process for Single Micron Resolution Optical Gratings Used in X-ray Computed Tomography
X-ray Computed Tomography (CT) is a process that produces three-dimensional x-ray images, allowing for better diagnosis and analysis of complex internal medical conditions. New advances in the optical techniques used in this process promise to produce better results while reducing patient risk. One …
-
Visualizing fluidized beds with X-rays
… minimum fluidization velocity experiments, X-ray computed tomography (CT), X-ray stereography, and particle tracking to fluidized beds of glass beads, ground walnut shell, and ground corncob operating with a variety of flow conditions. 3-D local, time-averaged gas holdup is calculated from CT …
-
A survey of algebraic algorithms in computerized tomography
X-ray computed tomography (CT) is a medical imaging framework. It takes measured projections of X-rays through two-dimensional cross-sections of an object from multiple angles and incorporates algorithms in building a sequence of two-dimensional reconstructions of the interior structure. This …
-
X-ray CT scatter correction by a physics-motivated deep neural network
A fundamental problem in X-ray Computed Tomography (CT) is the scatter occurring due to the interaction of photons with the imaged object. Unless it is corrected, this phenomenon manifests itself as degradations in the reconstructions in the form of various artifacts. This makes scatter correction …
-
Design and applications of cold-cathode X-ray imaging systems
X-ray computed tomography (CT) and planar x-ray imaging are mainstays of modern clinical care. The electron generation mechanism in standard x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed …
-
Fluorinated Metal Complexes as MRI Contrast Agents
… system. MRI is preferred over positron emission tomography (PET) and X-ray computed tomography (CT) because it is non-invasive, non-radioactive, and provides 3-D imaging directly in vivo. Contrast agents are used in order to enhance the resolution of the images from MRI. All currently used …
-
Synthesis and Characterization of New Probes for use in Fluorescence and X-ray CT Bioimaging
… would then, however, be necessary to conduct any kind of mechanistic or interaction studies for he said drug within the biological system. Just to name a few, fluorescence and X-ray computed tomography (CT) methods allow for imaging of biological systems but require the need of compounds …
-
Fighting cancer with nanomedicine−drug-polyester nanoconjugates for targeted cancer therapy
… integrating well-established chemical reaction-controlled ring opening polymerization (ROP) with nanoprecipitation technique, I successfully developed a polymeric NC system based on poly(lactic acid) and poly(O-carboxyanhydrides) (OCA) that allows for the quantitative loading and …
-
Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography
… to increase that understanding through the collection of micro-scale data using x-ray computed tomography (CT). The quasi-static phenomena investigated included the tensile, compression, and reinforcing bar pull-out behavior of both ultra-high performance concrete (UHPC) and conventional …
-
Systematic assessment of the influence of voids on the material performance and failure in additively manufactured polymers.
… (FFF) is increasingly used for small-scale manufacturing for niche applications, however, its wide adoption for industrial-scale production of structural components requires significant improvement in the overall quality and functionality of the produced products. While the mechanical properties …
-
Development and Implementation of Fully 3D Statistical Image Reconstruction Algorithms for Helical CT and Half-Ring PET Insert System
X-ray computed tomography: CT) and positron emission tomography: PET) have become widely used imaging modalities for screening, diagnosis, and image-guided treatment planning. Along with the increased clinical use are increased demands for high image quality with reduced ionizing radiation dose to …
-
Iterative Methods for the Reconstruction of Tomographic Images with Unconventional Source-detector Configurations
X-ray computed tomography (CT) holds a critical role in current medical practice for the evaluation of patients, particularly in the emergency department and intensive care units. Expensive high resolution stationary scanners are available in radiology departments of most hospitals. In many …
-
Assessment of brown-rot decay using X-ray computer tomography and ultrasonic measurements
… was recorded before and after they were subjected to the controlled decay. X-ray computed tomography (CT) was then carried out. From the CT scans and recorded mass data, the specimens’ corresponding volumes and densities were calculated. Blocks decayed for twelve weeks experienced, on the …
-
Investigating the Evolution of Rock Discontinuity Asperity Degradation and Void Space Morphology under Direct Shear
… of relative weakness and enhanced hydraulic conductivity and, thus, have a substantial influence on the hydro-mechanical behaviour of the overall rock mass. While the shearing of rock mass discontinuities has been extensively studied in the past, there remains uncertainty surrounding the …
-
Synthesis and characterization of cationic contrast agents & imaging of articular cartilage using X-ray computed tomography and magnetic resonance
… a painful, chronic, non-inflammatory disease affecting 140 million people worldwide that alters synovial joint structure and function. OA progressively breaks down hyaline cartilage, the hydrated tissue that provides a smooth, nearly frictionless surface and distributes loads applied to …
-
Flowable Fibrous Concrete For Thin Pavement Inlays
… fibrous concrete (FFC) mixture were characterized by relating their spatial distribution and orientations, determined from x-ray computed tomography (CT), with the measured toughness or fracture energy response of a FFC specimen. This new type of concrete, FFC, was developed to provide a …
-
Evaluation of foam concrete physical properties and mechanical response under indentation
… foam concrete is a widely accepted construction material with a controllable low strength. Conventional use of this material is often seen in applications such as excavatable landfilling or thermal isolation. Different from solid material, this cellularized cementitious foam tends to …
-
Three dimensional reconstruction of plant roots via low energy x-ray computed tomography
… organs for water and nutrient uptake. The structure and spatial distribution of plant roots in the soil affects a plant's physiological functions such as soil-based resource acquisition, yield and its ability to live under abiotic stress. Visualizing and quantifying roots' configuration below …
-
Multi-Class 3D Segmentation of Progressive Damage in Advanced Composites using Deep Learning
… important role in modern aerospace primary structures. Underpinning their growing utilization is their relatively high mass-specific stiffness and strength, together with tailorable bulk mechanical properties. However, while being key drivers of such performance benefits, CFRP microstructural …
-
Evaluation of a Dedicated SPECT-CT Mammotomography System for Quantitative Hybrid Breast Imaging
… the performance of the single photon emission computed tomography (SPECT) subsystem of a dedicated three-dimensional (3D) dual-modality breast imaging system for enhanced semi-automated, quantitative clinical imaging. This novel hybrid imaging system combines functional or molecular information …
Page 1 of 2