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 28 for “"Susceptibility mapping"”.
-
Magnetic susceptibility mapping of Point Pelee National Park beaches.
… in their sediment magnetic properties (magnetic susceptibility). In order to determine the degree of spatial variability of field magnetic susceptibility and potential causes, the magnetic susceptibility of the beach sands were mapped in transects perpendicular to the shoreline of Lake Erie with …
-
UNCERTAINTY QUANTIFICATION OF LANDSLIDE SUSCEPTIBILITY MAPPING USING BAYESIAN NETWORK
… to the U.S. Geological Survey (USGS). Landslide susceptibility mapping (LSM) can provide valuable insights for landslide characterization and helps optimize risk mitigation strategies. To enhance the reliability of LSM, uncertainty in landslides characterization must be identified and quantified. …
-
MR Susceptibility Mapping: Improved Quantification and Applications in Developmental Brain Imaging
… development. Prior studies using quantitative susceptibility mapping (QSM) have shown its unique sensitivity to myelin. However, due to the cylindrical structure of myelin sheaths wrapping around axons, the magnetic susceptibility measured by QSM of the white matter has been found to be …
-
Quantitative susceptibility mapping and susceptibility-based distortion correction of echo planar images
… that arise from changes in magnetic susceptibility throughout the object of interest. Distortion is typically corrected by acquiring an additional scan called a fieldmap. A fieldmap provides a direct measure of the magnetic perturbations, allowing distortions to be easily computed and …
-
Landslide susceptibility mapping through enhanced dynamic slope stability analysis using earth observing satellite measurements
… soil moisture to develop dynamic landslide susceptibility maps at regional scale.</p><p>Results show a strong relationship among remotely sensed soil moisture, rainfall and landslide events. Results also show a modified infinite slope stability model that directly includes vadose zone soil …
-
InSAR time series analysis and machine learning for ground subsidence monitoring and susceptibility mapping in Midvaal, South Africa
… issue, existing methodologies for monitoring and mapping ground subsidence susceptibility are limited by inefficiencies, labour-intensive processes, and reliance on sparse data sources, leading to delayed and inaccurate risk assessments. This study addresses these challenges by integrating …
-
Deep Learning Architectures for Improving Weather Research and Forecasting (WRF) Precipitation Estimates and Landslide Susceptibility Mapping: A Case Study of Puerto Rico
… DL models can be employed to predict landslide susceptibility maps (LSM) that rely on forecasted precipitation, landscape characteristics, and real-time soil measurements. These maps are essential for identifying high-risk areas, enabling proactive risk management to protect lives and …
-
Acquisition and reconstruction methods for magnetic resonance imaging
… resonance spectroscopic imaging, quantitative susceptibility mapping, functional MRI, and diffusion MRI. Despite its great versatility, MRI is limited by the long time required to acquire the data needed to form an image. Since a typical MRI protocol consists of multiple scans of the same …
-
Reconstruction algorithms for MRI
… Chemical Shift Imaging (CSI), and Quantitative Susceptibility Mapping (QSM). The main theme connecting the proposed methods is the utilization of prior knowledge on the reconstructed signal. This prior often presents itself in the form of sparsity with respect to either a prespecified or learned …
-
Model-based reconstruction for correcting magnetic susceptibility-induced artifacts in magnetic resonance imaging
While magnetic susceptibility is an essential contrast mechanism in magnetic resonance imaging (MRI), it also causes significant disruptions to the imaging process. Strong differences in magnetic susceptibility exist at the air and tissue interfaces in the brain, resulting in a magnetic field …
-
An Evaluation of DEM Generation Methods Using a Pixel-Based Landslide Detection Algorithm
… inventories is an important step in landslide susceptibility mapping, and automated algorithms for landslide detection will increasingly be relied upon as part of the mapping process. This study compares the effects of three different DTM generation methods on a pixel-based landslide detection …
-
Comparative assessment of flood resilience in urban and rural environments: a case study of Chennai City and Wardha River Sub-basin, India
… flood impacts. The thesis also evaluates flood susceptibility mapping techniques, comparing statistical- FR (Frequency Ratio) and SEI (Shannon’s Entropy Index) and machine learning models across varying spatial resolutions. In urban areas, extreme gradient boosting (XGB) outperformed other …
-
FIVE YEARS AFTER THE OCTOBER 8, 2005 KASHMIR EARTHQUAKE: ASSESSING POST-SEISMIC LANDSLIDING PROCESSES BETWEEN 2005 AND 2010
… fully assessed with the aid of monitoring and susceptibility mapping. Keywords: Earthquake, Landslide Hazard, Pakistan, Repeat Photography.
-
FIVE YEARS AFTER THE OCTOBER 8, 2005 KASHMIR EARTHQUAKE: ASSESSING POST-SEISMIC LANDSLIDING PROCESSES BETWEEN 2005 AND 2010
… fully assessed with the aid of monitoring and susceptibility mapping. Keywords: Earthquake, Landslide Hazard, Pakistan, Repeat Photography.
-
A regional study of landslide hazards and related features in the Upper Indus River Basin, northern Pakistan
… The techniques honed for this regional landslide mapping study began with compiling a stitched shaded topographic map of the Upper Indus River watershed; using remotely-sensed topographic maps from Russia combined with ASTER DEM 30m resolution data. Topographic recognition keys were then employed …
-
Role of Vegetation and Environmental Characteristics on Slope Stability in Northwest Arkansas
… leads to generalizations about slope failure susceptibility mapping, despite knowing that slope failures are likely the result of an extensively complex set of interactions among a number of environmental, edaphic, and geomorphic characteristics. Therefore a series of experiments were …
-
Measuring Brain Iron In Healthy Controls And Accessing Venous Abnormalities In Parkinson's Disease Using Mri
… to study the brain iron deposition. Quantitative susceptibility mapping (QSM) is another approch we used to study normal brain iron deposition as a further step since susceptibility is a tissue property that is free from geometry effect and imaging parameters. Except in the thalamus, iron …
-
Bilateral Ortohogonality Generative Acquisitions Method for Transmit Field Inhomogeneity Correction in Magnetic Resonance Imaging
… phase information is validated by quantitative susceptibility mapping in brain and Dixon imaging in liver and kidney. The multi-contrast turbo spin echo application of the method is also demonstrated for T1, T2 and proton density weighted MRI contrasts. Lastly, implementations of the developed …
-
Identification of Intracranial Lesions With Dual-Energy Computed to mography and Magnetic Resonance Phase Imaging
… Echo (GRE) MRI, these lesions appear as “foci of susceptibility” in which their signal is hypointense due to the magnetic susceptibility of the lesions differing from that of the background tissue.</p> <p>Dual-energy Computed Tomography (DECT) and Phase-Sensitive Magnetic Resonance Imaging …
-
Further development of magnetic resonance spectroscopic imaging using subspace-based models
… for high-resolution, high-SNR metabolic mapping at clinically relevant imaging speeds. This work further extends subspace-based MRSI methods along two major avenues. First, we have developed a novel method for simultaneously providing tissue magnetic susceptibility information and …
Page 1 of 2