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      Reduction of the radiofrequency heating of metallic devices using a dual‐drive birdcage coil

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      Author
      Eryaman, Yiğitcan
      Türk, Esra Abacı
      Oto, C.
      Algin, O.
      Atalar, Ergin
      Date
      2013
      Source Title
      Magnetic Resonance in Medicine
      Print ISSN
      0740-3194
      Publisher
      Wiley
      Volume
      69
      Issue
      3
      Pages
      845 - 852
      Language
      English
      Type
      Article
      Item Usage Stats
      141
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      118
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      Abstract
      In this work, it is demonstrated that a dual-drive birdcage coil can be used to reduce the radiofrequency heating of metallic devices during magnetic resonance imaging. By controlling the excitation currents of the two channels of a birdcage coil, the radiofrequency current that is induced near the lead tip could be set to zero. To monitor the current, the image artifacts near the lead tips were measured. The electric field distribution was controlled using a dual-drive birdcage coil. With this method, the lead currents and the lead tip temperatures were reduced substantially [<0.3°C for an applied 4.4 W/kg SAR compared to >4.9°C using quadrature excitation], as demonstrated by phantom and animal experiments. The homogeneity of the flip angle distribution was preserved, as shown by volunteer experiments. The normalized root-mean-square error of the flip angle distribution was less than 10% for all excitations. The average specific absorption rate increased as a trade-off for using different excitation patterns. Copyright © 2012 Wiley Periodicals, Inc.
      Keywords
      RF safety
      Transmit arrays
      Dual-drive birdcage coil
      Implant heating
      Permalink
      http://hdl.handle.net/11693/21044
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/mrm.24316
      Collections
      • Aysel Sabuncu Brain Research Center (BAM) 183
      • Department of Electrical and Electronics Engineering 3524
      • National Magnetic Resonance Research Center (UMRAM) 175
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