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Simulation of electromagnetic effect...

Chen, Ji.

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Simulation of electromagnetic effects in magnetic resonance imaging.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Simulation of electromagnetic effects in magnetic resonance imaging./
Author:	Chen, Ji.
Description:	102 p.
Notes:	Adviser: Jianming Jin.
Contained By:	Dissertation Abstracts International59-11B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9912211
ISBN:	0599105283

Simulation of electromagnetic effects in magnetic resonance imaging.
Chen, Ji.

Simulation of electromagnetic effects in magnetic resonance imaging. - 102 p.

Adviser: Jianming Jin.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998.

The analysis of electromagnetic (EM) interaction with biological objects in magnetic resonance imaging (MRI) is a topic of great current interest. As MRI systems increase the operating frequency of their radio-frequency (RF) components, many design assumptions for low-frequency MRI systems become questionable. Understanding both the RF circuit theory and the electromagnetic fields generated by RF coils becomes critical in high-frequency MRI RF coil design. Accurate simulation of an electromagetic field inside a biological object becomes very important in the MRI instrument design. Due to the high inhomogeneity of biological objects, the physical model of the simulation is very complicated. Several full-wave techniques are possible to analyze such a large and complicated MRI system. However, each technique might be best suited for specific applications. The very popular numerical techniques in the computational EM community are the finite element method (FEM), the method of moments (MoM), and the finite difference, time domain (FD-TD) method.

ISBN: 0599105283Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Simulation of electromagnetic effects in magnetic resonance imaging.
LDR:02967nam 2200277 a 45 001 934608
005 20110509
008 110509s1998 eng d
020 $a 0599105283
035 $a (UnM)AAI9912211
035 $a AAI9912211
040 $a UnM $c UnM
100 1 $a Chen, Ji. $3 1258307
245 1 0 $a Simulation of electromagnetic effects in magnetic resonance imaging.
300 $a 102 p.
500 $a Adviser: Jianming Jin.
500 $a Source: Dissertation Abstracts International, Volume: 59-11, Section: B, page: 5985.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998.
520 $a The analysis of electromagnetic (EM) interaction with biological objects in magnetic resonance imaging (MRI) is a topic of great current interest. As MRI systems increase the operating frequency of their radio-frequency (RF) components, many design assumptions for low-frequency MRI systems become questionable. Understanding both the RF circuit theory and the electromagnetic fields generated by RF coils becomes critical in high-frequency MRI RF coil design. Accurate simulation of an electromagetic field inside a biological object becomes very important in the MRI instrument design. Due to the high inhomogeneity of biological objects, the physical model of the simulation is very complicated. Several full-wave techniques are possible to analyze such a large and complicated MRI system. However, each technique might be best suited for specific applications. The very popular numerical techniques in the computational EM community are the finite element method (FEM), the method of moments (MoM), and the finite difference, time domain (FD-TD) method.
520 $a 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.
590 $a School code: 0090.
650 4 $a Engineering, Electronics and Electrical. $3 626636
690 $a 0544
710 2 0 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 59-11B.
790 $a 0090
790 1 0 $a Jin, Jianming, $e advisor
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9912211