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      Improving RF safety in MRI by modifying the electric field distribution

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      Author
      Eryaman, Yiğitcan
      Atalar, Ergin
      Date
      2011
      Source Title
      2011 XXXth URSI General Assembly and Scientific Symposium
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      In this work we demonstrate that the radiofrequency (RF) electric field in magnetic resonance imaging (MRI) can be modified in order to enhance patient safety. The heating of metallic devices in MRI is directly related to electric field distribution. On the other hand the MR image homogeneity is related to forward polarized component of the magnetic field (transmit sensitivity). In order to prevent heating, electric field-free zones should be generated in the body without significantly altering the transmit sensitivity. For this purpose the linearly polarized birdcage coil is proposed as a metallic device friendly MRI coil. The zero electric field plane of the linear birdcage coil is coincided with the location of the metallic device and the heating is reduced as shown by simulations and experiments. One disadvantage of this approach is, the linear coils generate twice as much whole body average SAR when compared to quadrature birdcage coils. In order to solve this problem simulations are performed to find electromagnetic field solutions with reduced average SAR and uniform transmit sensitivity. © 2011 IEEE.
      Keywords
      Electric field distributions
      Linearly polarized
      Metallic devices
      MR images
      Patient safety
      Polarized components
      Radio frequencies
      Whole body
      Electric fields
      Electromagnetic fields
      Magnetic fields
      Magnetic resonance imaging
      Permalink
      http://hdl.handle.net/11693/28321
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/URSIGASS.2011.6051330
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      • National Magnetic Resonance Research Center (UMRAM) 175
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