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 140 for “"CT Images"”.
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Motion correction of PET/CT images
… Emission Tomography/Computed Tomography (PET/CT) is one of the many tools currently used to diagnose health and disease in patients. PET/CT explorations are typically used to detect: cancer, heart diseases, disorders in the central nervous system. Since PET/CT studies can take up to 60 minutes …
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Automated defect detection and evaluation in X-ray CT images
… popularity for industrial quality inspection tasks. It is a challenge however to use it in a fully automated assembly line, which requires robust algorithms for volumetric image analysis on noisy data. This work provides methods for the automatic detection of defects and their geometric …
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Segmentation and Fracture Detection in CT Images for Traumatic Pelvic Injuries
… and quantities of medical data have been collected due to advanced technology. A large number of significant and critical information is contained in these medical data. High efficient and automated computational methods are urgently needed to process and analyze all available medical data in …
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Segmentation of brain x-ray CT images using seeded region growing
… dissertation. They are intracranial volume extraction, noise suppression and automated segmentation of X-Ray Computerized Tomography (CT) images. The segmentation scheme is based on a Seeded Region Growing algorithm. The intracranial volume extraction is based on image symmetry and the noise …
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Geometry-based finite volume methods for modelling transport on micro-CT images
… popular for studying the microscopic structure of reservoir rocks. Direct numerical flow simulations are a common approach to compute petrophysical properties of rocks by modelling fluid flow on rock micro-Computed Tomography (CT) images. However, they are computationally demanding and …
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Finite element analysis of porcine trabecular bone based on micro-CT images
Made available in DSpace on 2015-07-22T22:46:09Z (GMT). No. of bitstreams: 2 JIN-THESIS-2015.PDF: 1428319 bytes, checksum: 90863a291e31979ea5abb92bf4aa2a16 (MD5) LICENSE.txt: 4205 bytes, checksum: 292729d61405bbb82bd379fc9a6f9b47 (MD5) Previous issue date: 2015-05-01
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2D-3D rigid-body registration of X-ray flourscopy and CT images
… Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Automatic interpretation of computed tomography (CT) images for hardwood log defect detection
… interpretation system for the automatic detection of internal hardwood log defects. The goal of the research is that such a system should not only be able to identify and locate internal defects of hardwood logs using computed tomography (CT) imagery, but also should be able to accommodate …
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Automatic detection and segmentation of brain lesions from 3D MR and CT images
The detection and segmentation of brain pathologies in medical images is a vital step which helps radiologists to diagnose a variety of brain abnormalities and set up a suitable treatment. A number of institutes such as iThemba LABS still rely on a manual identification of abnormalities. A manual …
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AUTOMATED MIDLINE SHIFT DETECTION ON BRAIN CT IMAGES FOR COMPUTER-AIDED CLINICAL DECISION SUPPORT
… shift estimation system is proposed. First, a CT slice selection algorithm (SSA) is designed to automatically select a subset of appropriate CT slices from a large number of raw images for MLS detection. Next, ideal midline detection is implemented based on skull bone anatomical features and …
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Determination of Aortic Elasticity from MR- and CT- Images Using an Automatic Active Contour Model
… important applications for clinical trials predicting arterial diseases before they become morphologically apparent. The elasticity is usually quantified by compliance measurements. Therefore, the relative temporal change in vessel cross-sectional area through the cardiac cycle or alternatively, …
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Task-specific observer performance and image quality : direct and indirect relationships in low-dose CT images
… was to examine image quality in low-dose CT images, as determined by a range of image quality measures (IQM), in addition to psychophysical assessment, and look at direct or indirect relationships. Method: CT images of an anthropomorphic chest phantom were obtained using increasing tube …
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Automated Measurement of Midline Shift in Brain CT Images and its Application in Computer-Aided Medical Decision Making
… traumatic brain injury (TBI) is known to be characterized by the shift of the middle line in brain as the ventricular system often changes in size and position, depending on the location of the original injury. In this thesis, the focus is given to processing of the CT (Computer Tomography) brain …
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Peridynamic Investigation of Stress-Strain Response and Fracture Behavior Variations in Micro-CT Images of Mock Energetic Nanocomposites
The stress-strain response and fracture behaviors of a mock energetic nanocomposite were investigated to reveal behaviors that contribute to variations throughout the sample. Approximately 100 XCT images that span the depth of a single sample were modeled in a peridynamics formulation to …
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A Comparison of Artificial Neural Network Classifiers for Analysis of CT Images for the Inspection of Hardwood Logs
This thesis describes an automatic CT image interpretation approach that can be used to detect hardwood defects. The goal of this research has been to develop several automatic image interpretation systems for different types of wood, with lower-level processing performed by feed forward artificial …
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Computer vision and texture analysis for characterization of X-ray images of rocks
X-ray micro-computed tomography (micro-CT) has provided us digital twins of physical rocks. Digital twins are raw grayscale micro-CT images that contain information regarding rock-microstructure. These raw micro-CT images are then transformed into their segmented counterparts, which attempt to …
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Imaging-based Phenotype for Cardiovascular Risk Assessment
… Over the past decades, a number of CV risk factors have been identified from longitudinal population studies. More recent studies have shown that imaging-based phenotypes, such as calcification and adipose can significantly increase the power of CV risk assessment. However, the current risk …
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Iterative reconstruction as a novel method of radiation dose reduction at computed tomography in patients with Crohn's disease
… medical imaging and the notable shift towards CT imaging making these patients an at risk group, provided context for this work. CT delivers some of the highest doses of ionising radiation in diagnostic radiology. Once a medical imaging examination is deemed justified, there is an onus on the …
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Bias and Variability In Image-Based Volumetric Yttrium-90 Dosimetry
… the patients are ineligible for surgical resection and external beam radiation therapy. The prognosis of untreated patient having liver cancer is very poor with life expectancy less than a year at advance stage. Hence the ability to predict treatment efficacy right after the treatment from …
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