Traditional 1H lung imaging using MRI faces numerous challenges and difficulties due
to low proton density and air-tissue susceptibility artifacts. New imaging techniques
using inhaled xenon gas can overcome these challenges at the cost of lower signal to
noise ratio. The signal to noise ratio determines reconstructed image quality and is
an essential parameter in ensuring reliable results in MR imaging. The traditional RF
surface coils used in MR imaging exhibit an inhomogeneous field, leading to reduced
image quality. For the last few decades, fractal-shaped antennas have been used to
optimize the performance of antennas for radiofrequency systems. Although widely
used in radiofrequency identification systems, mobile phones, and other applications,
fractal designs have yet to be fully researched in the MRI application space. The use of
fractal geometries for RF coils may prove to be fruitful and thus prompts an investiga-
tion as the main goal of this thesis. Preliminary simulation results and experimental
validation results show that RF coils created using the Gosper and pentaflake offer
improved signal to noise ratio and exhibit a more homogeneous field than that of a
traditional circular surface coil. / Thesis / Master of Applied Science (MASc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/25591 |
| Date | January 2020 |
| Creators | Nguyen, Jimmy |
| Contributors | Noseworthy, Michael, D., Electrical and Computer Engineering |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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