Simulation of Electromagnetic Effects in Magnetic Resonance Imaging
Chen, Ji
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https://hdl.handle.net/2142/81260
Description
Title
Simulation of Electromagnetic Effects in Magnetic Resonance Imaging
Author(s)
Chen, Ji
Issue Date
1998
Doctoral Committee Chair(s)
Jin, Jianming
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
In this thesis, these three techniques are used to investigate the interaction between the electromagnetic field and a human head. The FEM finds its efficient application in solving small but very complicated problems. The MoM-based biconjugate fast Fourier transform (BCG-FFT) technique, which dramatically reduces the computational memory requirement and the computational time, is employed to analyze the open RF coils in an MRI system. The FD-TD method, known for its ability to handle large and complex geometries, is applied to shielded birdcage coil analysis. Besides studying the field information inside the human head, the RF coil's resonant frequency shift due to the biological loading and the SNR of RF surface coils are also investigated in this thesis. It is expected that the EM solver can be combined with the heat transform equation to simulate the heating pattern inside biological objects. The EM solver can also be applied together with Bloch's equation to provide more detailed pictures of the NMR phenomenon.
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