Application of eddy current formulations to magnetic resonance imaging

Author

Renhart, W. ; Magele, C.A. ; Richter, K.R. ; Wach, P. ; Stollberger, R.

Author_Institution

Graz Univ. of Technol., Austria

Volume

28

Issue

2

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

1517

Lastpage

1520

Abstract

The calculation of 3-D radio-frequency (RF) fields with the aid of an eddy current formulation based on finite elements is described. It is shown that the displacement current density in the first Maxwell equation can be taken into account by making the conductivity a complex quantity. The validity of this formulation has been verified by calculating a conducting sphere influenced by a homogeneous time-harmonic RF field. The numerical results are compared with an analytical solution. The formulation described has been applied to calculate a 3-D phantom with regions of different conducting materials. For this phantom, measured results obtained by magnetic resonance imaging are compared

Keywords

biomedical NMR; eddy currents; finite element analysis; 3D RF fields; Maxwell equation; conducting materials; conducting sphere; displacement current density; eddy current formulations; finite elements; magnetic resonance imaging; time-harmonic RF field; Conducting materials; Conductivity; Current density; Eddy currents; Finite element methods; Imaging phantoms; Magnetic analysis; Magnetic resonance; Maxwell equations; Radio frequency;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.123985

Filename

123985