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 113 for “"x-ray imaging"”.
-
Annular beam X-ray imaging
… an investigation of depth‐resolved absorption imaging by scanning objects through an annular beam of X‐rays. The resultant ring shaped projections record depth dependent parallax. The study focuses on two different scanning methods. First, a single axis scan has been employed to record …
-
View synthesis for kinetic depth X-ray imaging
… of feature based synthesis of transmission X-ray images. The synthetic imagery is formed through matching and morphing or warping line-scan format images produced by a novel multi-view X-ray machine. In this way video type sequences, which periodically alternate between synthetic and detector …
-
Physics-assisted machine learning for X-ray imaging
X-ray imaging is capable of imaging the interior of objects in two and three dimensions non-invasively, with applications in biomedical imaging, materials study, electronic inspection, and other fields. The reconstruction process can be an ill-conditioned inverse problem, requiring regularization …
-
Characterization of alginate scaffolds using X-ray imaging techniques
… (SEM) and light microscopy, and emerging X-ray imaging techniques, such as micro-computed tomography (micro-CT) and synchrotron radiation (SR) X-ray imaging, to characterize the alginate scaffolds. Firstly, the material properties of freeze-dried alginate scaffolds were evaluated using …
-
A photon counting pixel detector for x-ray imaging
… in this thesis as an alternative to current imaging systems in medical imaging and synchrotron radiation applications. The technology has been developed from research performed in High Energy Physics, in particular, for the ATLAS experiment at the LHC, planned for 2005. This thesis describes …
-
Simulation of X-ray imaging systems for luggage inspection
This thesis describes XL, an x-ray imaging simulator for luggage inspection. This software system runs on a workstation and models x-ray sources, x-ray detectors and objects between them. A simple graphical interface permits the user to specify simulation parameters and inputs. XL then uses Monte …
-
View synthesis for depth from motion 3D x-ray imaging.
The depth from motion or kinetic depth X-ray imaging (KDEX) technique is designed to enhance the luggage screening at airport checkpoints. The technique requires multiple views of the luggage to be obtained from an arrangement of linear X-ray detector arrays. This research investigated a solution …
-
Intelligent X-ray imaging inspection system for the food industry.
… factory. This research presents a generic X-ray imaging inspection system with application for the detection of foreign bodies in a meat product for the food industry. The most important modules in the system are the image processing module and the high-level detection system. This research …
-
Using X-ray Imaging Techniques to Determine Density of Foods
… (CT) and digital radiography (DR) utilizing x-ray imaging showed greater capability for evaluation of food density. The x-ray attenuation through materials is dependent on the chemical composition and is proportional to density as described by the Beer-Lambert's law. This relationship forms the …
-
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 …
-
Simulation studies on X-ray imaging of brain parenchyma and tumors
Computed Tomography (CT) is an imaging modality with many advantages but is lacking of the ability to image the tissues in the parenchyma of the brain and brain tumours in early stages. Aim of the presented research is to investigate whether CT could be used to image the soft tissue of the brain …
-
Digital radiography: image acquisition and scattering reduction in x-ray imaging.
Since the discovery of the X-rays in 1895, their use in both medical and industrial imaging applications has gained increasing importance. As a consequence, X-ray imaging devices have evolved and adapted to the needs of individual applications, leading to the appearance of digital image capture …
-
Locating regions of interest prior to X-ray imaging using stereo-photogrammetry
… of interest (ROIs) on human subjects prior to X-ray imaging on the Lodox Statscan whole body imaging system.
-
Evaluating the usability of an X-ray imaging system in forensic pathology
Post mortem imaging (PMI) is increasingly being adopted as an alternative to invasive autopsies in forensic pathology. PMI can be used as a sole technique or adjunct to an autopsy. The Lodox Xmplar-dr is an X-ray imaging system that has been adopted for use in PMI. The purpose of this study was to …
-
Long range x-ray imaging utilizing coded aperture techniques and dynamic reconstruction
… and hydrogen present in these explosives, x-ray backscattering provides a viable method of collecting information about these targets by analyzing their shape. Furthermore, a coded aperture used in conjunction with dynamic reconstruction algorithms offers high sensitivity and resolution even …
-
Modeling and Development of Iterative Reconstruction Algorithms in Emerging X-ray Imaging Technologies
<p>Many new promising X-ray-based biomedical imaging technologies have emerged over the last two decades. Five different novel X-ray based imaging technologies are discussed in this dissertation: differential phase-contrast tomography (DPCT), grating-based phase-contrast tomography (GB-PCT), …
-
In-situ Study of Single Pharmaceutical Granule Drying using Synchrotron X-ray Imaging
… Comparatively, the use of in-situ synchrotron X-ray imaging techniques allows for fast processes such as single pharmaceutical granule drying to be visualized due to the higher photon flux, good stability, and higher spatial and temporal resolutions that lead to a much faster method than …
-
The REgolith X-ray Imaging Spectrometer flight model : structural design, analysis, and testing
… design, analysis, and testing of the REgolith Xray Imaging Spectrometer (REXIS), a student-led instrument on board the National Aeronautics and Space Administration (NASA) Origins Spectral Interpretation Resource Identification and Security-Regolith Explorer (OSIRIS-REx) asteroid sample return …
-
Enhanced Portability and Anti-Frosting Functionality of Cryostats for Synchrotron-Based X-ray Imaging
… of light produced from synchrotrons enables X-ray imaging down to the micron and submicron scale. This high degree of resolution is necessary to study metals in hydrated biological samples, where trace (metal) elements are found in the lowest concentration. Water within these aqueous samples …
Page 1 of 6