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Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications

Chen, Yi
http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025

Abstract Details

2016, Master of Science, Ohio State University, Electrical and Computer Engineering.
Due to deficiencies of the conventional coil Magnetic Resonance Imaging (MRI) under ultra-high DC magnetic field to improve the imaging quality, a Travelling-Wave MRI (TWMRI) is discussed here. The main purpose of this research is to investigate the propagation characteristics of electromagnetic waves within the imaging area and the connection with the excitation source of the travelling wave. The travelling wave inside the imaging area has been modeled as a waveguide excitation problem with and without the human body inside. The research discussed here can be divided into near field analysis of the source (antenna) inside a circular waveguide that is empty (free-space) and partially filled with a phantom to account for the presence of a human body. Both analytical solution and numerically simulated results with various excitation sources are shown. The analytical solutions are implemented with MATLAB [Matrix Laboratory] and the numerical simulation is done with ANSYS HFSS [High Frequency Structural Simulator]. As expected, the results show that the excitation of the propagating waveguide modes is closely related to the near fields of the source. With these results, a proper source to improve the excitation of the desired waveguide modes can be designed. The desired modes have to be determined based on the image processing schemes use in this application. This thesis does not consider image processing.
Roberto Rojas-Teran, Professor (Advisor)
Patrick Roblin, Professor (Committee Member)
73 p.
Electrical Engineering
Electromagnetic; Travelling-wave MRI; Numerical Solution

Recommended Citations

Citations

  • Chen, Y. (2016). Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025

    APA Style (7th edition)

  • Chen, Yi. Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025.

    MLA Style (8th edition)

  • Chen, Yi. "Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025

    Chicago Manual of Style (17th edition)

osu1449158025
5,187
© 2016, some rights reserved.Creative Commons License Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications by Yi Chen is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.