• Title/Summary/Keyword: Eddy-current

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Analysis of Eddy Current Effect in Magnetic Resonance Imaging Using the Finite Element Method (유한요소법에 의한 자기공명영상시스템에서의 와전류 영향 분석)

  • Lee, Jeong-Han;Gang, Hyeon-Su;Jo, Min-Hyeong;Mun, Chi-Ung;Lee, Gang-Seok;Lee, Su-Yeol
    • Journal of Biomedical Engineering Research
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    • v.20 no.1
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    • pp.53-58
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    • 1999

  • 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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