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 6 of 6 for “"Magnetic field inhomogeneity"”.
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Examination of susceptibility effects on functional and dynamic magnetic resonance imaging
A homogeneous, static magnetic field is important in magnetic resonance imaging. When a homogeneous 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 …
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Methods for chemical exchange saturation transfer magnetic resonance imaging
… saturation transfer (CEST) is a relatively new magnetic resonance imaging (MRI) acquisition technique that generates contrast dependent on tissue microenvironment, such as protein concentration and intracellular pH. CEST imaging has the potential to become an important biomarker in a wide range …
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Local and global SAR constrained large tip angle 3D kT̳-points parallel transmit pulse design at 7 T
… there has been a push towards higher main field strengths in magnetic resonance imaging (MRI) to achieve better contrast and higher signal to noise ratio (SNR). A drawback to current imaging systems at high field is transmit magnetic field inhomogeneity, which degrades both SNR and …
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Plasma processes in pulsar environments
… identified by their periodically pulsed electromagnetic emission. The source of the radiation is believed to be associated with the electron-positron (pair) plasma populating the pulsar magnetosphere. The theory of pulsar radiation is still in its infancy and there is lack of understanding about …
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Development of Optimised Pulse Sequences for Magnetic Resonance Imaging of Tumour Metabolism
… Monitoring tumour cell death using 2H magnetic resonance spectroscopy and spectroscopic imaging: 2H magnetic resonance spectroscopic imaging (MRSI) has been shown recently to be a viable technique for metabolic imaging in the clinic. The relatively low sensitivity of 2H detection is …
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Model-based reconstruction for correcting magnetic susceptibility-induced artifacts in magnetic resonance imaging
While magnetic susceptibility is an essential contrast mechanism in magnetic resonance imaging (MRI), it also causes significant disruptions to the imaging process. Strong differences in magnetic susceptibility exist at the air and tissue interfaces in the brain, resulting in a magnetic field …