A Switched-Mode Breast Coil for 7 T MRI Using Forced-Current Excitation

Jiaming Cui, John C. Bosshard, Joseph V. Rispoli, Ivan E. Dimitrov, Sergey Cheshkov, Mary Preston McDougall, Craig Malloy, Steven M. Wright

Research output: Contribution to journalArticle

6 Scopus citations


In high-field magnetic resonance imaging, the radio frequency wavelength within the human body is comparable to anatomical dimensions, resulting in B<inf>1</inf> inhomogeneity and nonuniform sensitivity patterns. Thus, this relatively short wavelength presents engineering challenges for RF coil design. In this study, a bilateral breast coil for <sup>1</sup>H imaging at 7 T was designed and constructed using forced-current excitation. By forcing equal current through the coil elements, we reduce the effects of coupling between the elements to simplify tuning and to ensure a uniform field across both breasts. To combine the benefits of the higher power efficiency of a unilateral coil with the bilateral coverage of a bilateral coil, a switching circuit was implemented to allow the coil to be reconfigured for imaging the left, right, or both breasts.

Original languageEnglish (US)
Article number7045544
Pages (from-to)1777-1783
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Issue number7
StatePublished - Jul 1 2015


  • 7T
  • breast coils
  • dual mode
  • forced-current excitation (FCE)
  • high field MRI

ASJC Scopus subject areas

  • Biomedical Engineering

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    Cui, J., Bosshard, J. C., Rispoli, J. V., Dimitrov, I. E., Cheshkov, S., McDougall, M. P., Malloy, C., & Wright, S. M. (2015). A Switched-Mode Breast Coil for 7 T MRI Using Forced-Current Excitation. IEEE Transactions on Biomedical Engineering, 62(7), 1777-1783. [7045544]. https://doi.org/10.1109/TBME.2015.2403850