Analysis of wave behavior in lossy dielectric samples at high field

Qing X. Yang, Jinghua Wang, Xiaoliang Zhang, Christopher M. Collins, Michael B. Smith, Haiying Liu, Xiao Hong Zhu, J. Thomas Vaughan, Kamil Ugurbil, Wei Chen

Research output: Contribution to journalArticle

151 Citations (Scopus)

Abstract

Radiofrequency (RF) field wave behavior and associated non-uniform image intensity at high magnetic field strengths are examined experimentally and numerically. The RF field produced by a 10-cm-diameter surface coil at 300 MHz is evaluated in a 16-cm-diameter spherical phantom with variable salinity, and in the human head. Temporal progression of the RF field indicates that the standing wave and associated dielectric resonance occurring in a pure water phantom near 300 MHz is greatly dampened in the human head due to the strong decay of the electromagnetic wave. The characteristic image intensity distribution in the human head is the result of spatial phase distribution and amplitude modulation by the interference of the RF traveling waves determined by a given sample-coil configuration. The numerical calculation method is validated with experimental results. The general behavior of the RF field with respect to the average brain electrical properties in a frequency range of 42-350 MHz is also analyzed.

Original languageEnglish (US)
Pages (from-to)982-989
Number of pages8
JournalMagnetic Resonance in Medicine
Volume47
Issue number5
DOIs
StatePublished - May 9 2002

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Head
Electromagnetic Radiation
Salinity
Magnetic Fields
Water
Brain

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

Cite this

Yang, Q. X., Wang, J., Zhang, X., Collins, C. M., Smith, M. B., Liu, H., ... Chen, W. (2002). Analysis of wave behavior in lossy dielectric samples at high field. Magnetic Resonance in Medicine, 47(5), 982-989. https://doi.org/10.1002/mrm.10137
Yang, Qing X. ; Wang, Jinghua ; Zhang, Xiaoliang ; Collins, Christopher M. ; Smith, Michael B. ; Liu, Haiying ; Zhu, Xiao Hong ; Vaughan, J. Thomas ; Ugurbil, Kamil ; Chen, Wei. / Analysis of wave behavior in lossy dielectric samples at high field. In: Magnetic Resonance in Medicine. 2002 ; Vol. 47, No. 5. pp. 982-989.
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Yang, QX, Wang, J, Zhang, X, Collins, CM, Smith, MB, Liu, H, Zhu, XH, Vaughan, JT, Ugurbil, K & Chen, W 2002, 'Analysis of wave behavior in lossy dielectric samples at high field', Magnetic Resonance in Medicine, vol. 47, no. 5, pp. 982-989. https://doi.org/10.1002/mrm.10137

Analysis of wave behavior in lossy dielectric samples at high field. / Yang, Qing X.; Wang, Jinghua; Zhang, Xiaoliang; Collins, Christopher M.; Smith, Michael B.; Liu, Haiying; Zhu, Xiao Hong; Vaughan, J. Thomas; Ugurbil, Kamil; Chen, Wei.

In: Magnetic Resonance in Medicine, Vol. 47, No. 5, 09.05.2002, p. 982-989.

Research output: Contribution to journalArticle

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