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

Yigitcan Eryaman, Esra Abaci Turk, Cagdas Oto, Oktay Algin, Ergin Atalar

Research output: Contribution to journalArticle

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 [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.

Original languageEnglish (US)
Pages (from-to)845-852
Number of pages8
JournalMagnetic Resonance in Medicine
Volume69
Issue number3
DOIs
StatePublished - Mar 1 2013
Externally publishedYes

Keywords

  • dual-drive birdcage coil
  • implant heating
  • RF safety
  • transmit arrays

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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