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Specific absorption rates and induced current densities for an anatomy‐based model of the human for exposure to time‐varying magnetic fields of MRI
Author(s) -
Gandhi Om P.,
Chen Xi Bin
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(199904)41:4<816::aid-mrm22>3.0.co;2-5
Subject(s) - specific absorption rate , finite difference time domain method , electromagnetic coil , magnetic field , nuclear magnetic resonance , human head , physics , imaging phantom , head (geology) , electrical impedance , conductor , absorption (acoustics) , current (fluid) , current density , radiofrequency coil , computational physics , materials science , acoustics , optics , computer science , telecommunications , quantum mechanics , geomorphology , antenna (radio) , composite material , thermodynamics , geology
A 6‐mm resolution, 30‐tissue anatomy‐based model of the human body is used to calculate specific absorption rate (SAR) and the induced current density distributions for radiofrequency and switched gradient magnetic fields used for MRI, respectively. For SAR distributions, the finite‐difference time‐domain (FDTD) method is used including modeling of 16‐conductor birdcage coils and outer shields of dimensions that are typical of body and head coils and a new high‐frequency head coil proposed for the 300–400 MHz band. SARs at 64, 128, and 170 MHz have been found to increase with frequency (f ) as f k where k is on the order of 1.1–1.2. The tables of the calculated maximum 1 kg and 100 g SAR may be used to calculate the maximum RF currents and/or magnetic fields that may be used in order not to exceed the safety guidelines. Because of the low frequencies associated with switched gradient magnetic fields, a quasi‐static impedance method is used for calculation of induced current densities that are compared with the safety guidelines. Magn Reson Med 41:816–823, 1999. © 1999 Wiley‐Liss, Inc.