Analysis of the eddy-current induced artifacts and the temporal compensation in nuclear magnetic resonance imaging

Author

Ahn, C.B. ; Cho, Z.H.

Author_Institution

Dept. of Radiol. Sci., California Univ., Irvine, CA, USA

Volume

10

Issue

1

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

47

Lastpage

52

Abstract

Reduction of eddy currents by a temporal compensation of the input current waveform to the gradient coil is studied with an analytic solution. The technique is the inverse filtering of the eddy-current affected field response, which is calculated from the diffusion equation. The limitation of the temporal compensation due to the spatially variant eddy currents is also investigated for whole-body diagnostic imaging systems and small-bore nuclear magnetic resonance (NMR) microscopy systems. Within a limited imaging volume of less than 60% of the gradient coil diameter, most of eddy-current problems can be solved by the technique

Keywords

biomedical NMR; eddy currents; patient diagnosis; analytic solution; diffusion equation; eddy-current induced artifacts; gradient coil; gradient coil diameter; input current waveform; inverse filtering; nuclear magnetic resonance imaging; small-bore NMR microscopy systems; temporal compensation; whole-body diagnostic imaging systems; Aging; Boring; Coils; Degradation; Eddy currents; Equations; Image analysis; Magnetic analysis; Magnetic resonance imaging; Nuclear magnetic resonance;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.75610

Filename

75610