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 “"magnetic field inhomogeneities"”.
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A Novel Method to Assess Pulse Wave Velocity using Single Velocity Encoding in Phase Contrast Imaging
… velocity (PWV) using conventional phase contrast magnetic resonance imaging (PC-MRI) is recognized as a standard technique to assess arterial stiffness by measuring the arrival times of blood velocity waveforms. Conventional PC-MRI requires the acquisition of two sets of complex images with …
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Improved magnetic resonance chemical shift imaging at 3 Tesla using a 32-channel integrated RF-shim coil array
… the method is highly vulnerable to local main magnetic field (Bo) inhomogeneities arising from magnetic susceptibility differences which is predominantly present in air-tissue interfaces. Such magnetic field inhomogeneities result in number of imaging artifacts including chemical shift …
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Two-ion control and polarization forces for precise mass comparisons
… trapping the two ions was completely limited by magnetic field noise. Our new technique reduces the impact of both magnetic field and trap voltage noise by more than three orders of magnitude. We can measure and control the relative motion of the two ions in the Penning trap. We have developed a …
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A two-ion balance for high precision mass spectrometry
… to many sources of fluctuations (e.g. of the magnetic field). To minimize the systematic error associated with the Coulomb interaction between the two ions, we keep them about 1 mm apart from each other, on a common magnetron orbit. We have developed novel techniques to measure and control all …
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Towards imaging cerebral microvascular blood flow using MRI
… 4) generating low power deposition at high magnetic strength of 3 T, and 5) significantly reducing slice profile artifacts in flow measurements, and 6) being more immune to arterial transit time effects compared to the existing continuous or pseudo-continuous ASL methods. To optimize the …
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Advances in studying order and dynamics in condensed matter by NMR
… discovery of the basic phenomenon in 1945, the field of NMR was continuously growing. NMR spectroscopy and relaxometry are powerful analytical techniques in material science and biochemistry. Magnetic resonance imaging (MRI) has a huge impact on the medical field, mentioning the non-invasive …
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A study on the ion temperature gradient driven turbulence in tokamak plasmas
… energy production is to confine the plasma using magnetic fields. The tokamak is the device that produces the best results concerning plasma magnetic confinement to date. One of the main tasks of fusion research is the understanding of plasma confinement. The energy confinement must be …