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Analysis of wave behavior in lossy dielectric samples at high field
Abstract
Radiofrequency (RF) field wave behavior and associated nonuniform 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. Magn Reson Med 47:982–989, 2002. © 2002 Wiley‐Liss, Inc.
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Cites
Yee, K. (1966) · IEEE Transactions on Antennas and Propagation · doi:10.1109/tap.1966.1138693 · Cited by 15,008
Cited by
Uğurbil, K., Xu, J., Auerbach, E. J., Moeller, S., Vu, A. T., Duarte-Carvajalino, J. M., Lenglet, C., Wu, X., Schmitter, S., Van de Moortele, P. F., et al. (2013) · NeuroImage · doi:10.1016/j.neuroimage.2013.05.012 · Cited by 812
9.4T human MRI: Preliminary results
Vaughan, T., DelaBarre, L., Snyder, C., Tian, J., Akgun, C., Shrivastava, D., Liu, W., Olson, C., Adriany, G., Strupp, J., et al. (2006) · Magnetic Resonance in Medicine · doi:10.1002/mrm.21073 · Cited by 317
Self-citationClinically feasible NODDI characterization of glioma using multiband EPI at 7 T
Wen, Q., Kelley, D. A. C., Banerjee, S., Lupo, J. M., Chang, S. M., Xu, D., Hess, C. P., & Nelson, S. J. (2015) · NeuroImage: Clinical · doi:10.1016/j.nicl.2015.08.017 · Cited by 88
Metadata
- Authors
- Yang, Q. X., Wang, J., Zhang, X., Collins, C. M., Smith, M. B., Liu, H., Zhu, X., Vaughan, J. T., Ugurbil, K., & Chen, W.
- Venue
- Magnetic Resonance in Medicine
- Publisher
- Wiley
- Published
- 2002-04-23
- Volume
- 47
- Issue
- 5
- Pages
- 982-989
- ISSN
- 0740-3194 (ISSN-L)
- 1522-2594
- OpenAlex
- W2155156416
- Cited by
- 255
- References
- 1
- FWCI
- 6.09
- Type
- journal article
- Language
- en
- Open access
- closed
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- Yang, Q. X., Wang, J., Zhang, X., Collins, C. M., Smith, M. B., Liu, H., Zhu, X., Vaughan, J. T., Ugurbil, K., & Chen, W. (2002). Analysis of wave behavior in lossy dielectric samples at high field. Magnetic Resonance in Medicine. https://doi.org/10.1002/mrm.10137
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