Auto-tuning of the RF transmission line coil for high-fields magnetic resonance imaging (MRI) systems

Sung Min Sohn, John Thomas Vaughan, Anand Gopinath

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

RF coil with microstip transmission line elements have been used for high-fields magnetic resonance imaging (MRI) to inductively excite and receive the nuclear magnetic resonance signals in anatomy. These coil elements have narrow bandwidth due to its high quality factors (Qs). Although high signal-to-noise ratio (SNR) of RF coils is obtained from this property it has a critical drawback, loading (body) effect that causes the resonance frequency and Q of RF coils to change when different human heads or bodies are loaded. There is an alternative to manual tuning that needs a few minutes and remains a major obstacle to the use of RF transmission line coils in high-fields MRI systems. In this study, an adaptive impedance matching technique for 7 Tesla MRI systems is proposed to avoid mismatch of the RF loaded coils at the Larmor frequency (297MHz).

Original languageEnglish (US)
Title of host publication2011 IEEE MTT-S International Microwave Symposium, IMS 2011
DOIs
StatePublished - Sep 7 2011
Externally publishedYes
Event2011 IEEE MTT-S International Microwave Symposium, IMS 2011 - Baltimore, MD, United States
Duration: Jun 5 2011Jun 10 2011

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Conference

Conference2011 IEEE MTT-S International Microwave Symposium, IMS 2011
CountryUnited States
CityBaltimore, MD
Period6/5/116/10/11

Keywords

  • Impedance matching
  • Magnetic resonance imaging (MRI)
  • Microstrip antennas
  • RF transmission line coil
  • body effect

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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  • Cite this

    Sohn, S. M., Vaughan, J. T., & Gopinath, A. (2011). Auto-tuning of the RF transmission line coil for high-fields magnetic resonance imaging (MRI) systems. In 2011 IEEE MTT-S International Microwave Symposium, IMS 2011 [5972842] (IEEE MTT-S International Microwave Symposium Digest). https://doi.org/10.1109/MWSYM.2011.5972842