Title :
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
fDate :
3/1/1991 12:00:00 AM
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;
Journal_Title :
Medical Imaging, IEEE Transactions on
