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Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil
Author(s) -
Hand Jeffrey W.,
Lau Raymond W.,
Lagendijk Jan J.W.,
Ling Junxiao,
Burl Mike,
Young Ian R.
Publication year - 1999
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/(sici)1522-2594(199907)42:1<183::aid-mrm24>3.0.co;2-i
Subject(s) - specific absorption rate , bioheat transfer , electromagnetic coil , decoupling (probability) , radiofrequency coil , nuclear magnetic resonance , materials science , magnetic resonance imaging , electromagnetic field , hyperthermia , thermal , magnetic field , mechanics , biomedical engineering , heat transfer , physics , computer science , thermodynamics , radiology , medicine , telecommunications , quantum mechanics , control engineering , meteorology , antenna (radio) , engineering
The finite difference time domain method is used to calculate the specific absorption rate (SAR) due to a butterfly surface coil in a realistic tissue model of the leg. The resulting temperature distribution and temperature changes are found using a finite difference solution to the bioheat transfer equation. Reasonable agreement is found between predicted temperature changes and those measured in vivo provided that the resulting hyperthermia does not induce noticeable changes in perfusion. The method is applicable to radiofrequency dosimetry problems associated with high B o field magnetic resonance systems and where knowledge of spatial variation in SAR is important in assessing the safety of new magnetic resonance procedures. Magn Reson Med 42:183–192, 1999. © 1999 Wiley‐Liss, Inc.