Practical Aspects of Birdcage Coils

F. David Doty, George Entzminger, Cory D. Hauck, John P. Staab

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Numerical modeling and experimental results are presented for a variety of birdcages for high-field MRI microscopy. The data include the first published numerical calculations and experimental measurements of magnetic filling factors of birdcages or other MRI coils. Fast, 3D calculations for shielded coils are demonstrated using the Biot-Savart law along with energy minimization. It is shown that the near-field, higher-order inhomogeneity effects remaining after a first-order, asymmetry correction may easily exceed 20% in situations where it is desirable to maximize filling factor. It is also found that an order-of-magnitude improvement in the accuracy of predicted capacitor values may be achieved by using a more detailed circuit model of the birdcage resonator.

Original languageEnglish
Pages (from-to)144-154
Number of pages11
JournalJournal of Magnetic Resonance
Volume138
Issue number1
DOIs
StatePublished - May 1999
Externally publishedYes

Funding

The authors thank numerous technicians and engineers at (or formerly at) Doty Scientific, especially Xunming Chen, Andy Yang, Eugene Deyneka, Glenn Doty, David McCree, Jiong Shao, Art Boman, and Mark Moore, for their assistance in programming, experiments, calculations, analysis, and prototyping. The authors also thank the referees for a number of helpful comments. This work was supported by Doty Scientific, Inc.

Keywords

  • Birdcage
  • Coils
  • Filling factor
  • Inhomogeneity
  • Microscopy

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