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 144 for “"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 systematic review of DTI studies in Bipolar Disorder
… 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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Simultaneous DTI and rs-fMRI using the navigated diffusion sequence
… imaging (fMRI) and diffusion tensor imaging (DTI) experiments are normally performed separately. The idea of extracting inherently co-registered activation/connectivity maps and diffusion parameters has resulted in efforts to develop methods for simultaneous fMRI and DTI data acquisition. …
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DTI and MEG Imaging of Subconcussive Impacts in High School Football Players
Football has the highest concussion rate of any competitive contact sport. High school aged males visit the emergency department for concussions caused by football more often than any other cause. While proper identification, diagnosis, and management of concussions in the emergency department can …
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DTI-based tractographic analysis of white matter alterations in HIV infected children
Despite early combination antiretroviral therapy (cART) administration, children born with human immunodeficiency virus (HIV) continue to demonstrate neurodevelopmental abnormalities. Often, there is a link between structural and functional abnormalities. Previously, we found HIV-associated changes …
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DTI, structural network connectivity, and neurocognitive changes associated with subconcussive impacts in youth football players
American football has the highest rates of mild traumatic brain injury (mTBI) among youth athletes (age 8-13 years) in the United States. It is well established that concussions can lead to disruption of white matter (WM) microstructural integrity and lead to neurocognitive impairment. Little is …
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The South African Small Business Programme, 1994- 2001: An Evaluation of the dti Family Institutions
… of the Department of Trade and Industry (the dti) pro-actively and objectively within the scope of the study.
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DTI-ALPS REFLECTS WHITE MATTER DIFFUSION ANISOTROPY AND MICROSTRUCTURAL HETEROGENEITY RATHER THAN GLYMPHATIC FLOW: INSIGHTS FROM MULTI-MODAL MRI
… imaging–analysis along the perivascular space (DTI-ALPS) has been widely adopted as a putative non- invasive MRI biomarker of glymphatic flow. However, the biological specificity of the DTI- ALPS index remains unclear, and recent evidence has raised concerns that it may primarily reflect …
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FMRI guided DTI at the grey-white matter interface : with application to a connectivity analysis of the default mode network in Urbach-Wiethe disease
… regions involved in specific tasks, and with DTI (Diffusion Tensor Imaging) the structural connections between these areas can be mapped. The aim of this thesis is to to identify and track only those WM tracts entering and leaving a GM Region Of Interest (ROI) defined by fMRI.
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Comparison of progression of diffuse axonal injury with histology and diffusion tensor imaging
… matter tracts. MR-diffusion tensor imaging (MR-DTI) has been reported to be sensitive to TAI in human TBI patients by measuring water molecular diffusion motion in white matter fiber tracts. To date, only one correlative animal study has been carried out to investigate the DTI relationship to …
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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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Understanding Cancer Treatment Delay and Survival
Background: The diagnosis to treatment interval (DTI) is important for patient disease management and survival among patients with cancer. Guidance for conducting studies examining the association between the DTI and overall survival (OS) is needed to address potential bias, improve methodological …
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Image Processing Considerations for High Resolution Diffusion Tensor Imaging of the Human Brainstem
… brain noninvasively. Diffusion tensor imaging (DTI) fits the diffusivity measurements from many directions to a tensor model of the diffusivity of water in brain tissue. DTI is particularly useful for interrogating the health and organization of white matter in the brain. The human brainstem has …
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Diffusion Tensor Imaging and Quantitative Tractography of Skeletal Muscle for Microstructural Tissue Characterization
… 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 information that other …
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Changes In Cerebral White Matter, Vascular Risk And Cognition Across The Adult Lifespan
… past decade have used diffusion tensor imaging (DTI) to examine associations between age, diffusion and anisotropy measures of cerebral white matter (WM), and cognitive performance. However, few have examined relationships between intra-individual change in DTI measures of WM and cognitive …
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Diffusion Tensor Imaging: Evaluation of Tractography Algorithm Performance Using Ground Truth Phantoms
… also known as Diffusion Tensor Imaging (DTI), is a unique medical imaging modality that provides non-invasive estimates of White Matter (WM) connectivity based on local principal directions of anisotropic water diffusion. DTI tractography estimates are a macroscopically sampled …
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Characterising Peritumoural Progression of Glioblastoma using Multimodal MRI
… including T1 weighted with contrast, FLAIR and DTI measures of isotropy (DTI-p) and anisotropy (DTI-q). The results showed that patients can have a better clinical outcome with a larger resection of the abnormal DTI q areas. Further study of the imaging characteristics of abnormal peritumoural …
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Diffusion Tensor Imaging in Pediatric Brain Tumor Patients
… 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. We present evidence of how the introduction of this …
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Fine Motor Skills, Processing Speed, And White Matter Integrity Among Pediatric Brain Tumor Survivors Who Received Proton Radiotherapy
… is measured through diffusion tensor imaging (DTI). Additionally, the neurotoxicity of XRT contributes to maladaptive neurocognitive function and quality of life. In recent decades, proton radiotherapy (PRT) has been theorized as a less neurotoxic alternative to XRT. The advantages of PRT have …
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High resolution 3D diffusion tensor imaging for delineating neuronal architectures
Diffusion tensor imaging (DTI) has long been an important tool for early diagnosis and monitoring of neuronal diseases as well as for understanding the connectivity of neuronal networks. However, the intrinsic problem of DTI is the partial volume effect, which worsens when the structure of interest …
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