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 14 of 14 for “"Diffusion-Weighted MRI"”.
-
Complex muscle architecture described with diffusion weighted MRI
… causing expansion in the orthogonal direction. Diffusion weighted magnetic resonance imaging (DW-MRI), provides a convenient, non-destructive, method for deriving fiber architecture in many tissues. DW-MRI finely probes tissue microstructure by determining direction-specific variations of signal …
-
Diffusion-Weighted MRI of Fibrous Tissue: Contribution of Fat
… that predicts the effect of fat solution on an MRI signal by a DW-GE pulse sequence. The region of interest is a heterogeneous structure inside a 3mmx3mmx9mm voxel, consisting of loosely arranged micron-sized tubes filled with fat. By assuming that the tubes are parallel inside the domain, the …
-
Diffusion-weighted MRI of skeletal muscle: Estimation of microstructural parameters
… and repeatable measures of muscle efficiency. Diffusion-weighted magnetic resonance imaging (dMRI) enables the non-invasive probing of the microstructural organization of tissue by sensitizing the MR signal to the micron length scale displacements of water molecules within the tissue, which …
-
Dynamic Contrast-Enhanced MRI and Diffusion-Weighted MRI for the Diagnosis of Bladder Cancer
… the abilities of 3T dynamic contrast-enhanced MRI (DCE-MRI) and diffusion-weighted MRI (DWI) to improve the detection and staging and to enable the prediction of chemotherapeutic response in bladder cancer. A total of fifty-three patients were enrolled in the study. Different inclusion criteria …
-
Probing the effect of microstructure on water diffusion in engineered or biological materials with MRI
Water diffusion within skeletal muscles is a complex mass transport process due to the presence of barriers at multiple scales and the anisotropic structure of muscles. Magnetic Resonance Imaging (MRI) is an effective non-invasive technology for studying water transport in biological or engineered …
-
A numerical study of the effects of inhomogeneous media in diffusion weighted imaging
Diffusion Weighted Imaging (DWI) -a common Magnetic Resonance Imaging (MRI) technique - is used to infer material properties of tissues from the average diffusion of water molecules over brief time intervals. In particular, the Apparent Diffusion Coefficient (ADC), a measure of the magnitude of …
-
Alignment of contrast enhanced medical images
… over time, such as in dynamic contrast enhanced MRI, requires that many images with different contrast be registered to the same coordinate system, compounding the problem. This thesis addresses these issues, beginning by presenting conditions under which conventional registration fails and …
-
Three dimensional mapping of lingual myoarchitecture
… 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. In this thesis research, several diffusion weighted MRI signal acquisition …
-
The use of conventional and advanced magnetic resonance techniques in the assessment of primary brain tumours
… the value of conventional, perfusion- and diffusion-weighted magnetic resonance imaging (MRI) in patients with histology-proven low-grade gliomas (LGG), and the potential role of these methods in the management of patients with these brain tumours. Thirty-six patients were studied at the …
-
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 …
-
Causes and consequences of lacunar stroke
… clinical features, magnetic resonance imaging (MRI), renal function, and assessment of dietary salt. At 1-3 months post-stroke we carried out cognitive testing and contrast MRI to assess blood-brain barrier integrity. We followed patients up at 12 months post-stroke with repeat cognitive …
-
Diffusion Weighted MR Imaging in the Differentiation between Metastatic and Benign Lymph Nodes in Canine Patients with Head and Neck Disease
… are difficult to access for routine sampling. Diffusion weighted magnetic resonance imaging (DWI) has demonstrated the ability to differentiate metastatic from inflammatory/benign lymph nodes in clinical studies with human cancer patients through the calculation of quantitative values of …
-
The Measure and Meaning of Structural Similarity in the Brain
… At the same time, recent advances in structural MRI analytics have enabled large-scale mapping of anatomical similarity within individual brains. However, key questions remain that limit the current applicability and interpretability of research using similarity mapping approaches. What is the …
-
Novel multi-parametric, multi-modality imaging for the assessment of tumour biology in renal cell carcinoma
… investigated morphological and physiological 1H-MRI to detect early response and predict outcome. Multiparametric MRI demonstrated physiological changes after 12 days of anti-vascular therapy, which were compatible with its mechanism of action. The reduction in tumour diffusivity correlated with …