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Eddy currents induced by RF magnetic fields in biological bodies
Author(s) -
Lee JenHwang,
Chen KunMu
Publication year - 1982
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs017i05sp0061s
Subject(s) - eddy current , physics , magnetic field , electric field , computational physics , moment (physics) , electromagnetic field , field (mathematics) , electric current , symmetry (geometry) , ultra high frequency , mechanics , magnetic moment , magnetostatics , quantum electrodynamics , nuclear magnetic resonance , classical mechanics , condensed matter physics , electrical engineering , mathematics , geometry , quantum mechanics , engineering , pure mathematics
A new theoretical method for determining the electric field or the eddy current induced by a uniform RF magnetic field or a beam of RF magnetic field in a biological body of rotational symmetry is presented. The body is subdivided into a number of circular rings with various radii and cross‐sectional areas. The induced electric field or eddy current in each ring is then numerically determined on the basis of the theory of vector potential and the moment method. Numerical examples are given, and the results based on the present theory are found to deviate significantly from the often used, quasi‐static solutions. An experiment was conducted to measure the electric fields induced by a UHF magnetic field in phantom biological models. The theory was verified by the experiment and the existing theoretical results.