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 6 of 6 for “"radiofrequency pulses"”.
-
Design of multidimensional radiofrequency pulses in magnetic resonance imaging
Multidimensional radiofrequency (RF) pulses have wide applications in magnetic resonance imaging and spectroscopy experiments. These applications include reduced field-of-view (FOV) imaging of region-of-interest (ROI), B1 inhomogeneity correction, and simultaneous spatial-spectral selective …
-
Design of Multidimensional Large -Tip -Angle Radiofrequency Pulses for Parallel Transmission in Magnetic Resonance Imaging
… excitation principle to multidimensional RF pulses (including both single-channel and parallel transmission) is first identified. Then, an alternative approach using a new class of spiral trajectories, termed the variable slew-rate spirals, is proposed to locally reduce B 1 amplitude of 2D RF …
-
Accuracy of pulsed arterial spin labeling magnetic resonance imaging in the human brain : tag width and timing effects
… of cerebral blood flow (CBF). It involves using radiofrequency pulses designed to invert the spins of water in arterial blood, effectively creating a magnetic bolus. This inverted blood can be considered an endogenous contrast agent; imaging as it traverses the vascular tree allows CBF …
-
SIMULTANEOUS ARTIFACTS CORRECTION AND ACCELERATION FOR CHEMICAL EXCHANGE SATURATION TRANSFER IMAGING VIA DEEP LEARNING
… rely on molecular signal saturation through radiofrequency pulses with the same frequency as a prescribed molecule (e.g., glutamate) to be measured in a magnetic field. Because the background signal from water modular is generally greater than the signal from the prescribed molecular by …
-
Developing microwave probes for investigating opto-electronic processes in photovoltaic materials
… in NMR spectroscopy that the use of shaped radiofrequency pulses can increase the fidelity, excitation bandwidth and sensitivity of NMR techniques. Technical challenges associated with implementing shaped microwave pulses have inhibited the widespread application of these techniques in EPR …
-
Single-sided magnetic resonance sensors for clinical detection of volume status
… of linear frequency swept adiabatic radiofrequency pulses. These decrease the sensitivity of applied RF pulses to B1 and B0 inhomogeneity. Finally, we explore physiological considerations for the instrument’s clinical implementation with an MRI study of patients with chronic kidney …