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 journalArticlepeer-review

9 Scopus citations


In high-field magnetic resonance imaging, the radio frequency wavelength within the human body is comparable to anatomical dimensions, resulting in B1 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 1H 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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