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 16 of 16 for “"3T MRI"”.
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Development of registration methods for cardiovascular anatomy and function using advanced 3T MRI, 320-slice CT and PET imaging
Different medical imaging modalities provide complementary anatomical and functional information. One increasingly important use of such information is in the clinical management of cardiovascular disease. Multi-modality data is helping improve diagnosis accuracy, and individualize treatment. The …
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Tracking of Transplanted Mesenchymal Stem Cells Labeled with Fluorescent Magnetic Nanoparticle in Liver Cirrhosis Rat Model with 3T MRI
… in liver cirrhosis rat model with 3 Tesla (3T) MR equipment. Materials and Methods : For the evaluation of T2 and T2* relaxation time, 5 x 105 cells/ml mesenchymal stem cells (MSCs) were separately labeled for 12 hours using the ferumoxides and fluorescent magnetic nanoparticle containing …
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Advanced clinical MRI for better outcome in epilepsy surgery. Focusing on fMRI and prediction of verbal memory decline.
… the thesis was to evaluate the use of advanced MRI technology to improve results of epilepsy surgery, with focus on language and memory functions. Methods: In paper I, 25 patients with drug-resistant epilepsy were retrospectively included in the study for having been referred to high resolution …
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Ultra-high field (7T) magnetic resonance fingerprinting
… field (7T+) magnetic resonance imaging (MRI) improves image quality substantially compared to normal clinical 1.5T or 3T MRI. However, 7T MRI brings new challenges pertaining to B1+ inhomogeneity, B0 inhomogeneity, increased spectral bandwidth, and RF heating. Quantitative parametric …
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Implantable electrode structures and their RF effects in MRI machines
… patient undergoing a Magnetic Resonance Imaging (MRI) scan. Under the high-power RF field from an MRI machine, the conductors can behave as antennas and concentrate energy into small regions of body tissue, leading to excessive joule heating. Neurostimulator implants that employ long electrode …
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Pre-operative Risk Factors for Arteriovenous Fistula Failure in the Haemodialysis Population
… third approach aimed to determine if 3T MRI sequences was a feasible modality for the pre-operative workup and followup of these patients in a prospective study of 6 patients and 10 healthy volunteers, using three different sequences. 3T MRI was found to agree with measurements from …
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Sequence-phase optimal (SPO) [d̳e̳l̳t̳a̳]B₀ field control for lipid suppression and homogeneity for brain magnetic resonance spectroscopic imaging
… on four volunteer subjects using a commercial 3T MRI outfitted with a 32-channel integrated RF receive and local multi-coil shim array. This proposed sequence-phase-optimal shimming significantly improves brain-metabolite MRSI in vivo, as measured by lipid suppression, brain metabolite chemical …
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MRI-compatibility enhancements to USM performance for interventional devices in MR environments
… safe performance of magnetic resonance imaging (MRI)-guided robot-assisted interventions requires full control and high precision of assistive devices and tools. Because many currently available tools are not MRI-compatible, the characterization of existing tools and development of new ones are …
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Design of a 2D MRI compatible robot for performing prostate cancer treatment using therapeutic ultrasound
… prostate cancer. Magnetic resonance image (MRI) guidance of therapeutic ultrasound permits targeting and monitoring of therapy. In this thesis a prototype MRI compatible positioning device for the treatment of prostate cancer using therapeutic ultrasound is presented. The accuracy, MRI …
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Comprehensive MRI Safety Assessment: Impact of Strain-Relief Loop Position, Lateral Movement, and Varying Field Strengths on RF-Induced Heating of Medical Implants
Magnetic Resonance Imaging (MRI) utilizes strong magnetic fields and radiofrequency (RF) waves to produce detailed images of human organs, tissues, and various anatomical structures. Despite its benefits, individuals with active implantable medical devices (AIMDs) and passive implantable medical …
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A Contemporary Appraisal of Ocular Melanoma in New Zealand (Aotearoa)
… benign pigmented lesions in the community. A new MRI protocol to image iris lesions using a readily available 3T MRI scanner was developed – representing an advancement in ocular oncology imaging, and the characteristics of histologically-verified iris melanoma described. Notably, the incidence of …
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The role of cerebral small vessel disease in dementia
… In two separate cohorts, SVD was quantified on 3T MRI through the assessment of white matter hyperintensities (WMH), enlarged perivascular spaces (EPVS), cerebral microbleeds (CMB), and lacunes. Regional data on SVD location was used to derive composite scores for global SVD burden, and the SVD …
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Dynamic Contrast-Enhanced MRI and Diffusion-Weighted MRI for the Diagnosis of Bladder Cancer
… study is aimed at evaluating 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. …
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DTI-ALPS REFLECTS WHITE MATTER DIFFUSION ANISOTROPY AND MICROSTRUCTURAL HETEROGENEITY RATHER THAN GLYMPHATIC FLOW: INSIGHTS FROM MULTI-MODAL MRI
… 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 white-matter (WM) microstructure rather than perivascular fluid …
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Neurobiological mechanisms of hallucinations in schizophrenia
… and functional magnetic resonance imaging (MRI) to elucidate how hallucinations, chiefly in the context of schizophrenia, are supported by the brain, drawing on MRI indices of neurodevelopment. I introduce the phenomenon of hallucinations and motivate the utility of MRI for studying …
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In vivo pathology markers in tauopathies: prognostic and diagnostic implications
… being a response to neuronal injury. PET and MRI allow the in vivo visualisation and quantification of markers of neuropathology and neurodegeneration. However, the value of these in vivo measures at different stages of disease, and their value for predicting the clinical progression in …