Ultra High Field MRI: High-Frequency Coils

  • J. Thomas Vaughan
Part of the Biological Magnetic Resonance book series (BIMR, volume 26)


This chapter reviews RF volume, array, and surface coil modeling, design, construction, control, safety, and human in-vivo application examples for field strengths from 4 to 9.4 T. While a comprehensive variety of coils is included, focus is on the transmission line (TEM) technology head, body, surface, and array coils developed by the author over the past 16 years. References provide a supplement to this material for the many details that cannot be covered in a single book chapter.


Radio Frequency Transmission Line Surface Coil Specific Absorption Rate Radio Frequency Field 


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7. References

  1. 1.
    Ugurbil K, Garwood M, Ellermann J, Hendrich K, Hinke R, Hu X, Kim S-G, Menon R, Merkle H, Ogawa S. 1993. Imaging at high magnetic fields: initial experiences at 4T. Magn Reson Q 9:259–277.PubMedGoogle Scholar
  2. 2.
    Pan J, Vaughan J, Kuzniecky R, Pohost G, Hetherington H. 1995. High resolution neuroimaging at 4.1T. Magn Reson Imag 13:915–921.CrossRefGoogle Scholar
  3. 3.
    Hetherington H, Kuzniecky R, Pan J, Mason G, Morawetz R, Harris C, Faught E, Vaughan T, Pohost G. 1995. Proton nuclear magnetic resonance spectroscopic imaging of human temporal lobe epilepsy at 4.1T. Ann Neurol 38:396–404.PubMedCrossRefGoogle Scholar
  4. 4.
    Gruetter R. 1996. Observation of resolved glucose signals in 1H NMR spectra of human brain at 4 tesla. Magn Reson Med 36:1–6.PubMedCrossRefGoogle Scholar
  5. 5.
    Robitaille PML, Abduljalil A, Kangarlu A, Zhang X, Yu Y, Burgess R, Bair S, Noa P, Yang L, Zhu H, Palmer B, Jiang Z, Chakeres D, Spigos D. 1998. Human magnetic resonance imaging at 8T. NMR Biomed 11:263–265.PubMedCrossRefGoogle Scholar
  6. 6.
    Yacoub E, Pfeufer P, Van de Mortele P-F, Adriany G, Andersen P, Vaughan T, Merkle H, Ugurbil K, Hu X. 2001. Imaging brain function in human at 7 tesla. Magn Reson Med 45(4):588–594.PubMedCrossRefGoogle Scholar
  7. 7.
    Vaughan J, Garwood M, Collins C, Liu W, DelaBarre L, Adriany G, Andersen P, Merkle H, Goebel R, Smith M, Ugurbil K. 2001. 7T vs. 4T: RF power, homogeneity, & signal-to-noise comparison in head images. Magn Reson Med 46:24–30.PubMedCrossRefGoogle Scholar
  8. 8.
    Abragam A. 1978. The principles of nuclear magnetism. Oxford: Clarendon Press.Google Scholar
  9. 9.
    Hoult D, Lauterbur P. 1979. The sensitivity of the zeugmatographic experiment involving human samples. J Magn Reson 34:425.Google Scholar
  10. 10.
    Dickenson R. 1986. Measurement changes in tissue temperature using MR imaging. J Comput Assist Tomogr 10:468.Google Scholar
  11. 11.
    Brown R, Martens H, Patrick J, Zypman F. 1988. A layer model for RF penetration, heating and screening in NMR. J Magn Reson 80:225–247.Google Scholar
  12. 12.
    Shellock F, Crues J. 1988. Temperature changes caused by MR imaging of the brain. Am J Neuroradiol 9:287–291.PubMedGoogle Scholar
  13. 13.
    Athey T. 1989. A model of the temperature rise in the head due to magnetic resonance imaging procedures. Magn Reson Med 9:177–184.PubMedCrossRefGoogle Scholar
  14. 14.
    Bottomley P, Andrew E. 1978. RF magnetic field penetration, phase shift and power dissipation in biological tissue: implications for NMR imaging. Phys Med Biol 23:630–643.PubMedCrossRefGoogle Scholar
  15. 15.
    Stutzman W, Thiele G. 1981. Antenna theory and design. New York: John Wiley & Sons.Google Scholar
  16. 16.
    Libby L. 1945. Special aspects of balanced shielded loops. Proc IRE Waves Electrons 34:641–646.Google Scholar
  17. 17.
    Graf F. 1991. Modern dictionary of electronics. Indianapolis: Howard W. Sams.Google Scholar
  18. 18.
    Halliday D, Resnick R. 1974. Fundamentals of physics. New York: John Wiley & Sons.Google Scholar
  19. 19.
    Vaughan J, Hetherington H, Harrison J, Otu J, Pan J, Noa P, den Hollander J, Pohost G. 1993. High frequency coils for clinical nuclear magnetic resonance imaging and spectroscopy. Physica Medica 9:147–153.Google Scholar
  20. 20.
    Vaughan J, Hetherington H, Otu J, Pan J, Pohost G. 1994. High frequency volume coils for clinical NMR imaging and spectroscopy. Magn Reson Med 32:206–218.PubMedCrossRefGoogle Scholar
  21. 21.
    Vaughan J, Adriany G, Garwood M, Yacoub E, Duong T, DelaBarre L, Andersen P, Ugurbil K. 2002. A detunable TEM volume coil for high field NMR. Magn Reson Med 47(5):990–1000.PubMedCrossRefGoogle Scholar
  22. 22.
    Vaughan J, Adriany G, Snyder C, Tian J, Thiel T, Bolinger L, Liu H, DelaBarre L, Ugurbil K. 2004. Efficient high-frequency body coil for high-field MRI. Magn Reson Med 52:851–859.PubMedCrossRefGoogle Scholar
  23. 23.
    Harrington R. 1961. Time-harmonic electromagnetic fields. New York: McGraw-Hill.Google Scholar
  24. 24.
    Barfuss H, Fischer H, Hentschel D, Ladebeck R, Vetter J. 1988. Whole body imaging and spectroscopy with a 4 tesla system. Radiology 169:811–816.PubMedGoogle Scholar
  25. 25.
    Harrison J, Vaughan J. 1996. Finite element modeling of head coils for high frequency magnetic resonance application. Ann Rev Prog Appl Comput Electromagn 12:1220–1226.Google Scholar
  26. 26.
    Yang Q, Wang J, Zhang X, Collins C, Smith M, Liu H, Zhu X-H, Vaughan J, Ugurbil K, Chen W. 2002. An analysis of wave behavior in lossy dielectric samples at high field. Magn Reson Med 47:982–989.PubMedCrossRefGoogle Scholar
  27. 27.
    Brezovich I, Young J, Wang M. 1983. Temperature distributions in hyperthermia by electromagnetic induction: a theoretical model for the thorax. Med Phys 10:57.PubMedCrossRefGoogle Scholar
  28. 28.
    Duck F. 1990. Physical properties of tissue. New York: Academic Press.Google Scholar
  29. 29.
    Durney C, Massoudi H, Iskander M. 1986. Radiofrequency radiation dosimetry. Brooks Airforce Base, TX: USAF School of Aerospace Medicine.Google Scholar
  30. 30.
    Pennes HH. 1948. Analysis of tissue and arterial blood temperature in the resting human forearm. J Appl Physiol 1:93–122.Google Scholar
  31. 31.
    Carlson J. 1988. Radiofrequency field propagation in conductive NMR samples. J Magn Reson 78:563–573.Google Scholar
  32. 32.
    Brown R, Haacke M, Martens M, Patrick J, Zypman F. 1988. A layer model for RF penetration, heating, and screening in NMR. J Magn Reson 80:225–247.Google Scholar
  33. 33.
    Foster K, Schwan H. 1989. Dielectric properties of tissues and biological materials: a critical review. Crit Rev Bioeng 17:25.Google Scholar
  34. 34.
    Stuchly M. 1990. Applications of time-varying fields in medicine. Crit Rev Bioeng 18:89.Google Scholar
  35. 35.
    Kanal E, Shellock F, Lalith T. 1990. Safety considerations in MR imaging. Radiology 176:593–606.PubMedGoogle Scholar
  36. 36.
    Röschmann P. 1987. Radiofrequency penetration and absorption in the human body: limitations to high-field whole-body nuclear magnetic resonance imaging. Med Phys 14:922–931.PubMedCrossRefGoogle Scholar
  37. 37.
    Vaughan J, Harrison J, Hetherington H, Evanochko W, Pohost G. 1992. Radiofrequency surface coil heating measurements in porcine muscle. Proc Soc Magn Reson 4026.Google Scholar
  38. 38.
    Vaughan J, Harrison J, Thorn B, Pohost G. 1993. Hot rings: high frequency heating patterns in tissues. Proc Soc Magn Reson 1369.Google Scholar
  39. 39.
    Vaughan J, Haupt N, Noa P, Vaughn J, Pohost G. 1995. RF front end for a 4.1 tesla clinical NMR spectrometer. IEEE Trans Nucl Sci 42(4):1333–1337.CrossRefGoogle Scholar
  40. 40.
    Reykowski A, Wright S, Porter J. 1995. Design of matching networks for low noise preamplifiers. Magn Reson Med 33:848–852.PubMedCrossRefGoogle Scholar
  41. 41.
    Roemer P, Edelstein W, Hayes C, Sousa S, Mueller O. 1990. The NMR phased array. Magn Reson Med 16:192–225.PubMedCrossRefGoogle Scholar
  42. 42.
    Sodickson D, Manning W. 1997. Simultaneous acquisition of spatial harmonics (SMASH): fast imaging with radiofrequency coil arrays. Magn Reson Med 38:591–603.PubMedCrossRefGoogle Scholar
  43. 43.
    Pruessmann K, Weiger M, Scheidegger M, Boesiger P. 1999. SENSE: sensitivity encoding for fast MRI. Magn Reson Med 42:952–962.PubMedCrossRefGoogle Scholar
  44. 44.
    Griswold M, Jakob P, Edelman R, Sodickson D. 2000. A multicoil array designed for cardiac SMASH imaging. MAGMA 10:105–113.PubMedCrossRefGoogle Scholar
  45. 45.
    Edelstein W, Hardy C, Mueller O. 1986. Electronic decoupling of surface coil receivers for NMR imaging and spectroscopy. J Magn Reson 67:156–161.Google Scholar
  46. 46.
    Purcell E, Torrey H, Pound R. 1946. Resonance absorption by nuclear magnetic moments in a solid. Phys Rev 69:37.CrossRefGoogle Scholar
  47. 47.
    Schneider H, Dullenkopf P. 1977. Slotted tube resonator: a new NMR probe heat at high observing frequencies. Rev Sci Instrum 48:68.CrossRefGoogle Scholar
  48. 48.
    Röschmann P [Philips, assignee]. 1988. High-frequency coil system for a magnetic resonance imaging appartus. US Patent 4746866.Google Scholar
  49. 49.
    Bridges J. 1988. Cavity resonator with improved magnetic field uniformity for high frequency operation and reduced dielectric heating in NMR imaging devices. US Patent 4751464.Google Scholar
  50. 50.
    Baertlein B, Ozbay O, Ibrahim T, Lee R, Yu Y, Kangarlu A, Robitaille P. 2000. Theoretical model for an MRI radio frequency resonator. IEEE Trans Biomed Eng 47:535–545.PubMedCrossRefGoogle Scholar
  51. 51.
    Beck B, Plant D, Grant S, Thelwall P, Silver X, Mareci T, Benveniste H, Smith M, Collins C, Crozier S. 2002. Progress in MRI at the University of Florida. MAGMA 13:152–157.PubMedCrossRefGoogle Scholar
  52. 52.
    Bogdanov G, Ludwig R. 2002. Coupled microstrip line transverse electromagnetic resonator model for high-field magnetic resonance imaging. Magn Reson Med 47:579–593.PubMedCrossRefGoogle Scholar
  53. 53.
    Peshkovsky AS, Kennan RP, Fabry ME, Avdievich NI. 2005. Open half-volume transverse electromagnetic coil for high field magnetic resonance imaging. Magn Reson Med 53:937–943.PubMedCrossRefGoogle Scholar
  54. 54.
    Vaughan J. [Massachusetts General Hospital, assignee]. 2003. RF coil for imaging system. US Patent 6633131.Google Scholar
  55. 55.
    Zhang X, Ugurbil K, Chen W. 2003. A microstrip transmission line volume coil for human head MR imaging at 4T. J Magn Reson 161:242–251.PubMedCrossRefGoogle Scholar
  56. 56.
    Chipman R. 1968. Theory and problems of transmission lines. New York: McGraw-Hill.Google Scholar
  57. 57.
    Vaughan J, Roschmann P, Pan J, Hetherington H, Chapman B, Noa P, Vermeulen J, Pohost G. 1991. A double resonant surface coil for 4.1 tesla whole body NMR. Proc Soc Magn Reson 722.Google Scholar
  58. 58.
    Alderman D, Grant D. 1979. An efficient decoupler coil design which reduces heating in conductive samples in superconducting spectrometers. J Magn Reson 36:447–451.Google Scholar
  59. 59.
    Hayes C, Edelstein W, Schenck J, Mueller O, Eash M. 1985. An efficient highly homogeneous radiofrequency coil for whole-body NMR imaging at 1.5T. J Magn Reson 63:622–628.Google Scholar
  60. 60.
    Roemer P, Edelstein W [General Electric, assignee]. 1989. Double-sided RF shield for RF coil contained within gradient coils of NMR imaging device. US Patent 4879515.Google Scholar
  61. 61.
    Watkins R, Rohling K, Piel J, Rosenfeld D, Kelley D, Lenkinski R, Kressel H, Montag A. 2001. Whole body RF coil for 3 tesla MRI system. Proc Int Soc Magn Reson Med 1123.Google Scholar
  62. 62.
    Krause N [Siemens Aktiengesellschaft, Munich, assignee]. 1985. High frequency field system for nuclear magnetic resonance appartus. US Patent 4506224.Google Scholar
  63. 63.
    Adriany G, Van de Mortele P-F, Wiesinger F, Moeller S, Strupp J, Andersen P, Snyder C, Zhang X, Chen W, Pruessmann K, Boesiger P, Vaughan J, Ugurbil K. 2005. Transmit and receive transmission line arrays for 7 tesla parallel imaging. Magn Reson Med 53:434–445.PubMedCrossRefGoogle Scholar
  64. 64.
    Vaughan J, Adriany G, Ugurbil K, Andersen P, Strupp J [University of Minnesota, assignee]. 2005. Parallel transceiver for nuclear magnetic resonance system. US Patent Application 0050116715.Google Scholar
  65. 65.
    Bomsdorf H, Helzel T, Kunz D, Roschmann P, Tschendel O, Wieland J. 1988. Spectroscopy and imaging with a 4 tesla whole-body MR system. NMR Biomed 1:151.PubMedCrossRefGoogle Scholar
  66. 66.
    Collins C, Li S, Smith M. 1998. SAR and B1 field distributions in a heterogeneous human head model within a birdcage coil. Magn Reson Med 40:1–10.CrossRefGoogle Scholar
  67. 67.
    Ibrahim T, Lee R, Abduljalil A, Baertlein B, Robitaille PML. 2001. Dielectric resonances and B1 field inhomogeneity in UHFMRI: computational analysis and experimental findings. Magn Reson Imag 19:219–226.CrossRefGoogle Scholar
  68. 68.
    Van de Mortele P-F, Akgun C, Adriany G, Moeller S, Ritter J, Collins C, Smith M, Vaughan J, Ugurbil K. 2005. B1 destructive interferences and spatial phase patterns at 7 tesla with a head transceiver array coil. Magn Reson Med. In press.Google Scholar
  69. 69.
    Ibrahim TS, Lee R, Robitaille PML. 2001. Effect of RF coil excitation on field inhomogeneity at ultra-high fields: a field optimized TEM resonator. Magn Reson Imag 19:1339–1347.CrossRefGoogle Scholar
  70. 70.
    Vaughan J, Myer D. 2005. Parallel transceiver. New York, Minneapolis: Collaboration CPC, Bioengineering Inc.Google Scholar
  71. 71.
    Vaughan J, DelaBarre L, Snyder C, Adriany G, Collins C, Van de Mortele P-F, Ritter J, Strupp J, Andersen P, Tian J, Smith M, Ugurbil K. 2005. RF image optimization at 7T and 9.4T. Proc Int Soc Magn Reson Med 953.Google Scholar
  72. 72.
    Vaughan J [University of Alabama Birmingham, assignee]. 1996. High frequency volume coils for nuclear magnetic resonance applications. US Patent 5557247.Google Scholar
  73. 73.
    Vaughan J, Adriany G, Garwood M, Yacoub E, Duong T, DelaBarre L, Andersen P, Ugurbil K. 2002. A detunable transverse electromagnetic (TEM) volume coil for high field NMR. Magn Reson Med 47:990–1000.PubMedCrossRefGoogle Scholar
  74. 74.
    Barberi E, Gati J, Rutt B, Menon R. 2000. A transmit-only/recieve-only (TORO) RF system for high field MRI/MRS applications. Magn Reson Med 43:284–289.PubMedCrossRefGoogle Scholar
  75. 75.
    Adriany G, Ritter J, Van de Mortele P-F, Moeller S, Snyder C, Voje B, Vaughan J, Ugurbil K. 2005. A geometrically adjustable 16 channel transceive transmission line array for 7 tesla. Proc Int Soc Magn Reson Med 673.Google Scholar
  76. 76.
    Vaughan J, Garwood M, Ugurbil K. 2001. Volume coils for highest field MRI. IEEE Trans Ant Prop Soc Int Symp 1:378–381.Google Scholar
  77. 77.
    Vaughan J. 2005. How to do RF at high fields. Proc Int Soc Magn Reson Med 10.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • J. Thomas Vaughan
    • 1
  1. 1.Center for Magnetic Resonance ResearchUniversity of MinnesotaMinneapolisUSA

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