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http://dx.doi.org/10.7742/jksr.2017.11.5.361

Study on the Human Influence according to RF Pulse Intensity by use Dental Implant on BRAIN MRI: Using the XFDTD Program  

Choe, Dea-yeon (Department of Radiological Science, Collage of Health Sciences, Catholic University of Pusan)
Kim, Dong-Hyun (Department of Radiological Science, Collage of Health Sciences, Catholic University of Pusan)
Publication Information
Journal of the Korean Society of Radiology / v.11, no.5, 2017 , pp. 361-370 More about this Journal
Abstract
In the Brain MRI, RF Pulse is irradiated on the human body in order to acquire an image. At this time, a considerable part of the irradiated RF Pulse energy is absorbed as it is in our body. This will raise the temperature of the human body, but depending on the extent of exposure, it will affect the human body. The change of the SAR and the temperature of the head according to the change of the magnetic field strength is examined. And to investigate the difference in results depending on the use of dental implant. In the human head model, 64 MHz RF Pulse frequency generated from 1.5 T, 128 MHz RF Pulse frequency generated from 3.0 T, and 298 MHz RF Pulse frequency generated from 7.0 T send a frequency and experiment was performed using dental implant using the XFDTD program, we measured the SAR and body temperature changes around the head. The SAR value showed up to about 5800 times the difference at the RF Pulse frequency of 256 MHz, when with dental implant than without dental implant and as the frequency increased, the use of the dental implant increased difference in the SAR value. The change of the temperature of the head showed a temperature rise nearly 2 to 4 times when with dental implant than without dental implant. As the RF Pulse frequency increase, the SAR value increase, but the change of the temperature of the head decrease. Because of as the frequency increase, wavelength is smaller and the more the amount absorbed by the surface of the human. Physiological and biochemical studies of the human body ar necessary through studies of the presence of dental implant and the cause of reaction caused by change in the RF Pulse frequency.
Keywords
XFDTD; Dental implant; Human head model; Dental implant model; SAR; Temperature; RF Pulse energy;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields(up to 300 GHz), International Commission on Non-Ionizing Radiation Protection(ICNIRP) Guidelines.
2 M. G. Restivo, C. A. van den Berg, A. L. van Lier, D. L. Polders. A. J. Raaiijmakers, P. R. Luijten, H. Hooqduin. "Local specific absortion rate in brain tumors at 7 tesla". Magnetic Resonance Medicine, Vol. 7. No. 1, pp. 381-389, 2016.
3 Z. Wang, J. C. Lin. "Partial-Body SAR Calculations in Magnetic-Resonance Image(MRI) Scanning Sustems [Telecommunications Health and Safety]. IEEE Antennas and Propagation Magazine, Vol. 54. No. 2, pp. 230-237, 2012.   DOI
4 A. Hirata and O Fujiwara. "The correlation between mass-averaged SAR and temperature elevation in the human head model exposed to RF near-fields from 1to 6GHz". PhyWashington, D. C. Vol. 7, pp. 40-52, sics in medicine and biology, Vol. 54, No. 23, 2009.
5 K. B. Baker, J. A. Tkcah, A. Nyenhuis, M. Phillips, F. G. Shellock, J. Gonzalez-Martinez, A. R. Rezai. " Evaluation of specific absorption rate as a dosimeter of MRI-related import heating", Journal of Magnetic Resonance fo Imaging, Vol. 20, No. 2, pp. 315-320, 2004.   DOI
6 J. Y. Lee, "FDTD Modeling of the Korean Humaan Head using MRI Images", The Journal of Korean of Electromagnetic Engineering and Science, Vol. 11, No. 4, PP. 582-591, Jun, 2006.
7 A. D. Tinniswood, C. M. Furse, and O. P. Cahdhi, "Computations of SAR distributions for two anatomically based models of the human head using CAD files of commercial telephones and the parallelized FDTD code", IEEE Trans, Antennas Propagat, Vol. 46, pp. 829-833, Jun, 1998.   DOI
8 "Wikipedia," http://en.wikipedia.org/wiki/Finite-difference_time-domain_method
9 User's manual for XFTDT, http:www.remcom.com
10 J. Y. Jeong, "Analysis of SAR and Temperature Rise in the Human Head by Mobile Telephones", IEEE Transactions on Microwave Theory and Techniques, Vol. 47, pp. 1528-1534, May, 1999.   DOI
11 D. U. Hong, D. H. Kim, D. K. Kang, "Analysis of SAR Distribution Characteristics in a Head Model using FDTD", Journal of the korean Society of Safety, Vol. 19, pp. 34-40, 2004.
12 K. S. Yee, "Numerical solution of initial boundary value ons in isotropic media", IEEE Trans, Antennas Propagat, Vol. 14, pp. 302-307, May, 1966.   DOI