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KMID : 0372919990200010053
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Journal of Biomedical Engineering Research
1999 Volume.20 No. 1 p.53 ~ p.58
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Analysis of Eddy Current Effect in Magnetic Resonance Imaging Using the Finite Element Method
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Lee Jeong-Han
Gang Hyeon-Su
Jo Min-Hyeong
Mun Chi-Ung
Lee Gang-Seok
Lee Su-Yeol
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Abstract
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Eddy current in MRI systems degrades gradient field linearity and distorts gradient waveform. When the waveform distortion is spatially variant, it is very difficult to perform special imaging techniques such as the echo planar imaging technique or the fast spin echo imaging technique. In this study, we have developed a new technique to estimate the distorted gradient waveforms at any points inside the imaging region using the finite element method. After obtaining the eddy-current-effect transfer function, which represents magnitude and phase characteristics of the gradient field at a particular point, we have used the transfer function to estimate the actual gradient waveforms at the point. To verify the proposed technique, we have compared the estimated gradient waveforms with the measured ones.
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KEYWORD
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Eddy current, finite element method, magnetic resonance imaging, eddy current effect transfer function, induced-current impedance tomography
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