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 7 of 7 for “"transmission imaging"”.
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Design of a single element 3D ultrasound scanner
… toward developing ultrasonic systems for medical imaging. With advances in computational power, previously theorized scanning methods such as ultrasound tomography can now be realized. This thesis presents the design, error analysis, and initial image reconstructions from a single element 3D …
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Transillumination techniques in ophthalmic imaging
In vivo imaging of the human cornea and retina is typically performed 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 …
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Fast simulation of E1, B1 and Specific Absorption Rate for 7T MRI with the use of graphical processors
… recent interest with developments of parallel transmission systems (pTx). While real-time estimates of local SAR over large volumes as well as SAR-constrained pTx RF design are highly desirable goals, it is both difficult to control and computationally demanding. Steady advances in graphics …
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A novel low-dose approach to active detection of shielded high-Z materials
… of a new type of low-dose, rapid-scan, transmission radiography imaging system designed to detect the presence of special nuclear material in cargo. This thesis explores the processes, reactions, and detection methods that may be used to develop a transmission imaging system …
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Cosmic ray muons for spent nuclear fuel monitoring
… with any other technique. Muon scattering and transmission are used to perform monitoring and imaging of the stored contents of dry casks loaded with spent nuclear fuel. It is shown that one missing fuel assembly can be distinguished from a fully loaded cask with a small overlapping between the …
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Computational-Experimental Process Development for Laser Powder Bed Fusion Additive Manufacturing
… testbed. Powder layers are analyzed using X-ray transmission imaging and layer quality is statistically correlated to kinematic spreading parameters. A methodology for performing melt track experiments using high-precision metal templates as well as a machine learning-based automated image …
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X-ray microscope performance enhancement through control architecture change
The goal of this thesis is to apply control algorithms to improve the performance of nanopositioning devices used on the beamline in Advanced Photon Source (APS) at Argonne National Laboratory (ANL). A prototype device, better known as the Early User Instrument (EUI) was the subject of this work. …