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 77 for “"Diffusion Tensor Imaging (DTI)"”.
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Diffusion Tensor Imaging (DTI) of the Pediatric Spinal Cord
Diffusion Tensor Imaging (DTI) is a technique for noninvasively examining diffusion of water molecules in each voxel of an image in directions parallel and transverse to the plane of neuronal axons. The quantitative characteristic of DTI allows for the characterization of physical properties of …
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A comparison of methods for the registration of tractographic fibre images
Diffusion tensor imaging (DTI) and tractography have opened up new avenues in neuroscience and are allowing previously unexplored areas of neuroanatomy and function to be researched.
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The relationship between neurocognitive disorders, prospective memory impairment and white matter damage in clade C HIV-positive subjects
… prospective memory, cognitive function and Diffusion tensor imaging (DTI)/ White matter integrity of human immunodeficiency virus (HIV) positive individuals in the Western Cape. We hypothesize that: 1. Individuals infected with HIV will exhibit significantly poorer microstructural integrity …
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A stochastic tractography system and applications
… associated with neuroanatomical abnormalities. Diffusion Tensor Imaging (DTI) and stochastic tractography allow us to investigate white matter architecture non-invasively through measurements of water self diffusion throughout the brain. Many comparative studies of white matter architecture …
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Investigating white matter alterations and secondary neurodegeneration with MRI imaging and pathology in a mouse model of ischaemic stroke
… and recovery after stroke. Emerging clinical imaging evidence suggests that white matter degeneration, secondary neurodegeneration and inflammation in areas like the corpus callosum and thalamus after a middle cerebral artery stroke may contribute to cognitive decline. The aim of the current …
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Noise and error propagation in diffusion tensor imaging
Diffusion Tensor Imaging (DTI) is the in vivo visualization and analysis of white matter fiber tracts by measuring the anisotropy of water molecule diffusion in the brain tissue. DTI has been increasingly used in clinical imaging. Diffusion weighted images are affected by noise from the human …
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Diffusion Tensor Imaging and Quantitative Tractography of Skeletal Muscle for Microstructural Tissue Characterization
… to investigate the use of magnetic resonance diffusion tensor imaging (DTI) as a non-invasive tool to study the structure and organization of human skeletal muscle. By analyzing the diffusion of water molecules, DTI can uniquely probe the microstructure of skeletal muscle providing valuable …
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Resting State Functional Magnetic Resonance and Diffusion Tensor Imaging of Hemiplegic Cerebral Palsy Patients Treated with Constraint-Induced Movement Therapy: Predictors and Clinically Correlated Evidence of Neuroplasticity
… Resting state functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) acquisitions quantify global network organization and neural integrity, respectively, and found alterations in multiple resting state network connectivity patterns and significantly different …
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Diffusion Tensor Imaging in Pediatric Brain Tumor Patients
… outline our efforts to introduce an advanced MRI imaging technique called Diffusion Tensor Imaging (DTI) to the pediatric brain tumor population. We discuss the theory and application of DTI as it was performed in a series of translational investigations at St. Jude Children’s Research Hospital. …
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Diffusion Tensor Imaging and Cognition of Transient Ischemic Attack Patients and Healthy Controls
… biomarkers, which include clinical, demographic, imaging and neuropsychological considerations. Transient Ischemic Attack (TIA) patients are at an increased risk of dementia due to the presence of vascular risk factors and underlying vascular/neurodegenerative pathology. We hypothesized that at …
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EVALUATION OF INTERPOLATION AND REGISTRATION TECHNIQUES IN MAGNETIC RESONANCE IMAGE FOR ORTHOGONAL PLANE SUPER RESOLUTION RECONSTRUCTION
… aim is to use this concept on magnetic resonance imaging (MRI) data, for which the standard is to scan in several-plane orientation in a 2D fashion. As a result, clinical MRI, functional MRI (FMRI), diffusion weighted imaging (DWI)/diffusion tensor imaging (DTI), and MR angiography (MRA) tend to …
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A systematic review of DTI studies in Bipolar Disorder
In the last decade, multiple diffusion tensor imaging (DTI) studies have revealed changes in the microstructure of white matter in bipolar disorder. The results are poorly replicated and inconsistent, however, with some authors suggesting a predominance of alterations in fronto-limbic white matter. …
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Characterization of metal artifacts in diffusion tensor imaging for spinal cord applications
Diffusion Tensor Imaging (DTI) is a magnetic resonance imaging (MRI) technique used to measure in-vivo anisotropic water diffusion. This can give useful information regarding white matter integrity and has the potential to provide important biomarkers in spinal cord injury. One of the largest …
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ADInsight: A Multimodal and Explainable Framework for Alzheimer's Disease Progression and Conversion Prediction
… modalities, such as clinical data and advanced imaging, the research underscores the potential and limitations of singular approaches. As a response to these findings, this dissertation introduces a multimodal ensemble conversion prediction model that combines Diffusion Tensor Imaging (DTI) …
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Predictive models of tissue outcome in acute human cerebral ischemia using diffusion and perfusion weighted MRI
Diffusion (DWI) and perfusion weighted (PWI) magnetic resonance imaging (MRI) provide significant insight into acute stroke and can potentially be useful for clinical decision-making. In particular, current therapeutic decisions for acute human cerebral ischemia are typically based on time of …
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Three dimensional mapping of lingual myoarchitecture
… tongue, we employed several magnetic resonance imaging techniques generally based on direction specific differences in water diffusion. Muscle tissue in particular exhibits significant diffusion anisotropy in the direction of fibers, from which diffusion imaging is able to infer fiber direction. …
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Longitudinal Changes in Resting-State Connectivity after Traumatic Axonal Injury
… hours after traumatic brain injury with repeat imaging 7 months later. Aims: (a) characterize connectivity in these networks at the sub-acute stage of injury, (b) evaluate longitudinal change in networks with recovery, and (c) explore how this change might be associated with structural …
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Delay and probability discounting: a longitudinal study of neural, cognitive, and emotional processes contributing to adolescent development.
… white matter volume, subcortical volume, and diffusion tensor imaging (DTI) measures including fractional anisotropy and mean diffusivity. Delay discounting, but not probability discounting, showed significant maturation within individuals. Greater than expected maturation in delay discounting …
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Morphological alterations in frontotemporal dementia:
… morphological alterations in the white matter by diffusion tensor imaging (DTI)- MRI, compared with the more commonly used assessment of grey matter thickness and volume. DTI-MRI was better at separating FTD cases from controls than grey matter parameters, and may thus be a promising supplementary …
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Predicting learning success from patterns of pre-training magnetic resonance images
… ones, such as susceptibility-weighted imaging (SWI), T2-, T2*-quantitative as well as diffusion tensor imaging (DTI) and arterial spin labeling (ASL). We then discovered that (patterns of) nonheme iron (not heme) is the underlying factor driving learning prediction. This discovery of …
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