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Preamplifier Noise Figure Measurement and Radio Frequency Field Optimization in High Field Magnetic Resonance Imaging Open Access


Other title
radio frequency field
high field magnetic resonance imaging
high field radio frequency hardware
noise figure
preamplifier noise parameters
Type of item
Degree grantor
University of Alberta
Author or creator
Lagore, Russell Luke
Supervisor and department
Wilman, Alan (Biomedical Engineering)
De Zanche, Nicola (Oncology)
Examining committee member and department
Iyer, Ashwin (Electrical and Computer Engineering)
De Zanche, Nicola (Oncology)
Wilman, Alan (Biomedical Engineering)
Department of Biomedical Engineering

Date accepted
Graduation date
Master of Science
Degree level
High field magnetic resonance imaging (MRI) is an area of research interest due to the associated improvement in image quality possible. This improvement comes at a cost. Hardware design becomes more complex in order to overcome technical challenges at these higher field strengths. Signal-to-noise ratio is of paramount importance to MR image quality and this comes from carefully designed hardware and pulse sequences. This thesis focuses on the radiofrequency hardware of a high field MRI system. As frequency increases, the difficulties associated with radiofrequency hardware design increase. A noise figure and noise parameter measurement system was developed for measurement of the noise added by measurement electronics in MRI. Noise figure was found to increase for many transistor semiconductors as magnetic field increased. The radiofrequency transmit field was also studied. Radiofrequency hardware was modified to optimize the radiofrequency field to achieve proper contrast in MR images and improve transmit power efficiency.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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