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 7 of 7 for “"Susceptibility artifacts"”.
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FMRI In Patients With Implanted Electrodes: Mitigating Imaging Artifacts
… with implanted electrodes, aiming to mitigate susceptibility artifacts in the resulting fMRI images and thus enhance diagnostic accuracy. Epilepsy is a complex disorder requiring precise identification of epileptogenic zones for successful treatment, particularly in drug-resistant cases. The …
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Determining optimum imaging parameters for SWIFT: application to superparamagnetic iron oxides and magnetized objects.
… to imaging of superparamagnetic iron oxides. Susceptibility artifacts distort images around metal objects. In SWIFT images the susceptibility artifacts manifest as signal voids surrounded by pileup artifacts. This work develops predictive equations for the pileup artifacts around metallic …
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Examination of susceptibility effects on functional and dynamic magnetic resonance imaging
… field is not present it can cause imaging artifacts and misestimation of tissue structures, flow, and brain function. However, magnetic field inhomogeneity also drives certain contrast mechanisms including blood oxygenation level dependent fMRI. The two projects in this work look at the …
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Phase-based regional oxygen metabolism in magnetic resonance imaging at high field
… indicators for brain function and disease. Phase-susceptibility measurements in magnetic resonance imaging (MRI) have been used to quantify Yv in candidate cerebral veins. However, currently there is no method to quantify regional CMRO₂ using MRI. Here we propose a novel technique to quantify …
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Methods for chemical exchange saturation transfer magnetic resonance imaging
… field inhomogeneity. Images suffer from large susceptibility artifacts unless specialized BO inhomogeneity correction methods are employed that tremendously increase scan time. Second, the CEST contrast cannot be separated from the intrinsic macromolecular magnetization transfer (MT) asymmetry …
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Hochauflösende Darstellung des Innenohrs unter Anwendung zweier unterschiedlicher MRT-Sequenzen : Morphologie und pathologische Veränderungen
… detected using the True FISP sequence. The susceptibility artifacts in the semicircular canals were visible on the True FISP radiograph however. They were not present on the TSE radiograph. The True FISP as a high resolution examination is suited for the temporal bone imaging, but by the …
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Quantitative Signal- und Artefaktuntersuchungen zur Kategorisierung von Gefäßendoprothesen in vitro : Möglichkeiten der kontrastverstärkten 3D-Magnetresonanz-Angiographie im Vergleich zur Computertomographie
… implants such as stents often cause severe artifacts (such as beam-hardening and partial volume artifacts), which can limit the assessment of both the lumen and the surrounding tissue. Additionally the required radiation dose should be considered. Three-dimensional contrast-enhanced magnetic …