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 121 for “"Diffusion tensor imaging"”.
-
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 …
-
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. …
-
Noise reduction during diffusion tensor imaging of infants
Acoustic noise produced during echo planar imaging (EPI) has been known to reach excessive levels. In addition to causing general patient discomfort and anxiety, this level of noise makes the scanning of young children and infants particularly difficult. Infants are typically scanned while sleeping …
-
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 …
-
High-Resolution Diffusion Tensor Imaging and Human Brain Connectivity
<p>Diffusion tensor imaging (DTI) has emerged as a unique method to characterize brain tissue microstructure non-invasively. DTI typically provides the ability to study white matter structure with a standard voxel resolution of 8μL over imaging field-of-views of the extent of the human brain. As …
-
Diffusion Tensor Imaging Biomarkers of Brain Development and Disease
… differences resulting from disease. Recently, diffusion tensor magnetic resonance imaging has emerged as a powerful tool for brain atlasing; however, its utility is hindered by image resolution and signal limitations. These limitations can be overcome by imaging fixed ex-vivo specimens stained …
-
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 …
-
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 …
-
Diffusion Tensor Imaging: Evaluation of Tractography Algorithm Performance Using Ground Truth Phantoms
Diffusion Tensor Magnetic Resonance Imaging (DT-MRI), 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 …
-
Magnetization Transfer and Diffusion Tensor Imaging in Dogs with Intervertebral Disc Herniation
Background: Quantitative imaging surrogates of myelin and axonal integrity using magnetization transfer and diffusion tensor imaging may provide beneficial prognostic details on long-term post-surgical recovery in dogs with spinal cord injury (SCI) secondary to intervertebral disc herniation …
-
Pathological and Biomedical Characteristics of Spinal Cord Injury Determined Using Diffusion Tensor Imaging
… spinal cord contusion models. Magnetic resonance imaging: MRI) is the modality of choice to noninvasively detect the soft tissue injury, particularly suitable for assessing the tissue integrity in SCI. However, the convention MRI lacks capability of detecting and evaluating the injury severity …
-
Comparison of progression of diffuse axonal injury with histology and diffusion tensor imaging
… to conventional clinical magnetic resonance (MR) imaging techniques. Histologically, TAI is characterized by swollen axons that eventually disconnect and form axonal retraction balls (RB) in various white matter tracts. MR-diffusion tensor imaging (MR-DTI) has been reported to be sensitive to TAI …
-
Automated Quality Assurance for Magnetic Resonance Imaging with Extensions to Diffusion Tensor Imaging
Since its inception, Magnetic Resonance Imaging (MRI) has largely been used for qualitative diagnosis. Radiologists and physicians are increasingly becoming interested in quantitative assessments. The American College of Radiology (ACR) developed an accreditation program that incorporates tests …
-
Image Processing Considerations for High Resolution Diffusion Tensor Imaging of the Human Brainstem
Diffusion weighted MRI is used to measure the diffusivity of water in the human 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 …
-
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 …
-
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 …
-
Implementation of anatomical navigators for real time motion correction in diffusion tensor imaging
… correction methods using an optical system, diffusion-weighted prospective acquisition correction, or a free induction decay navigator have recently been applied to correct for motion in diffusion tensor imaging. These methods have some limitations and drawbacks. This article describes a …
-
Investigating Diffusion Tensor Imaging Correlates of Cognitive Impairment In Idiopathic Normal Pressure Hydrocephalus and Alzheimer'S Disease
<p>Modest expansion of the human brain cerebrospinal fluid (CSF)-filled ventricles is normal with aging, and because of this, it can be difficult for physicians to accurately diagnose and treat enlarged ventricles (ventriculomegaly), called hydrocephalus<sup>1</sup> (fluid or water in the brain) …
Page 1 of 7