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Design of Radiofrequency Coils for Magnetic Resonance Imaging Applications: A Computational Electromagnetic Approach

IBrahim, Tamer S
http://rave.ohiolink.edu/etdc/view?acc_num=osu1041281167

Abstract Details

2003, Doctor of Philosophy, Ohio State University, Electrical Engineering.
The advancement of MRI as a radiological instrument has been associated with a constant drive towards higher magnetic field strengths resulting in higher operational frequencies. More powerful magnets bring the promise of enhanced signal to noise ratio, exquisite resolution, and reduced scan times. At the same time however, MRI at higher frequencies adds significant engineering complexities to the MRI experiment, most notably in designing safe, versatile, and high-performance radio frequency (RF) coils. In this work, computational and theoretical electromagnetic analysis of several RF coils used in MRI are presented at Larmor frequencies that range between 64 and 470 MHz representing clinical imaging at 1.5:11 Tesla. The electromagnetic interactions with phantoms and anatomically detailed head models, including a developed high-resolution human head mesh, are studied at different field strengths. The computational tool of choice here was the finite difference time domain (FDTD) method. Combined with measurements using an 8 Tesla MRI system, currently the most powerful clinical magnet in the world and a 1.5 Tesla system, the FDTD method is utilized to study, analyze, and eventually design RF coils. Innovative Engineering approaches using phased array techniques are presented to improve the performance of RF head coils in terms of transverse magnetic field uniformity and reduction of specific absorption rate for operation at 4.7 and 8 Tesla. Novel analytical derivations are presented to explain the source of the MR signal. The combination of the analytical derivations, FDTD modeling, experiments. and infrared imaging gives a new prospective onto the electromagnetics associated with low and high field clinical imaging.
Robert Lee (Advisor)
298 p.
Magnetic Resonance Imaging; High Field MRI; Computational Electromagnetic; Modeling; Radiofrequency Coils; Finite Difference Time Domain Method

Recommended Citations

Citations

  • IBrahim, T. S. (2003). Design of Radiofrequency Coils for Magnetic Resonance Imaging Applications: A Computational Electromagnetic Approach [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1041281167

    APA Style (7th edition)

  • IBrahim, Tamer. Design of Radiofrequency Coils for Magnetic Resonance Imaging Applications: A Computational Electromagnetic Approach. 2003. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1041281167.

    MLA Style (8th edition)

  • IBrahim, Tamer. "Design of Radiofrequency Coils for Magnetic Resonance Imaging Applications: A Computational Electromagnetic Approach." Doctoral dissertation, Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1041281167

    Chicago Manual of Style (17th edition)

osu1041281167
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© 2002, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.