Time-domain finite-difference/finite-element hybrid simulations of radio frequency coils in magnetic resonance imaging

被引：13

作者：

Wang, Shumin ^{[1
]}

Duyn, Jeff H. ^{[1
]}

机构：

[1] Natl Inst Neurol Disorders & Stroke, NIH, Lab Funct & Mol Imaging, Bethesda, MD 20892 USA

来源：

PHYSICS IN MEDICINE AND BIOLOGY | 2008年 / 53卷 / 10期

关键词：

D O I：

10.1088/0031-9155/53/10/016

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

A hybrid method that combines the finite- difference time-domain (FDTD) method and the finite-element time-domain (FETD) method is presented for simulating radio-frequency (RF) coils in magnetic resonance imaging. This method applies a high-fidelity FETD method to RF coils, while the human body is modeled with a low-cost FDTD method. Since the FDTD and the FETD methods are applied simultaneously, the dynamic interaction between RF coils and the human body is fully accounted for. In order to simplify the treatment of the highly irregular FDTD/FETD interface, composite elements are proposed. Two examples are provided to demonstrate the validity and effectiveness of the hybrid method in high-field receive-and-transmit coil design. This approach is also applicable to general bio-electromagnetic simulations.

引用

页码：2677 / 2692

页数：16

共 27 条

[1] RETARDED TIME ABSORBING BOUNDARY-CONDITIONS [J].

BERNTSEN, S ;

HORNSLETH, SN .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1994, 42 (08) :1059-1064

[2] ANALYSIS OF THE NUMERICAL ERROR CAUSED BY THE STAIR-STEPPED APPROXIMATION OF A CONDUCTING BOUNDARY IN FDTD SIMULATIONS OF ELECTROMAGNETIC PHENOMENA [J].

CANGELLARIS, AC ;

WRIGHT, DB .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1991, 39 (10) :1518-1525

[3] A pyramidal element to link hexahedral, prismatic and tetrahedral edge finite elements [J].

Coulomb, JL ;

Zgainski, FX ;

Marechal, Y .

IEEE TRANSACTIONS ON MAGNETICS, 1997, 33 (02) :1362-1365

[4] A brick-tetrahedron finite-element interface with stable hybrid explicit-implicit time-stepping for Maxwell's equations [J].

Degerfeldt, D. ;

Rylander, T. .

JOURNAL OF COMPUTATIONAL PHYSICS, 2006, 220 (01) :383-393

[5]

Gabriel C., 1996, Environmental Health

[6]

Golub G. H., 1996, MATRIX COMPUTATIONS

[7] AN EFFICIENT, HIGHLY HOMOGENEOUS RADIOFREQUENCY COIL FOR WHOLE-BODY NMR IMAGING AT 1.5-T [J].

HAYES, CE ;

EDELSTEIN, WA ;

SCHENCK, JF ;

MUELLER, OM ;

EASH, M .

JOURNAL OF MAGNETIC RESONANCE, 1985, 63 (03) :622-628

[8]

Hoult DI, 1997, CONCEPT MAGNETIC RES, V9, P277, DOI 10.1002/(SICI)1099-0534(1997)9:5<277::AID-CMR1>3.0.CO

[9]

2-W

[10] Treating late-time instability of hybrid finite-element/finite-difference time-domain method [J].

Hwang, CT ;

Wu, RB .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1999, 47 (02) :227-232

← 1 2 3 →