PIER
 
Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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HIGH-ORDER ELECTROMAGNETIC MODELING OF SHORTWAVE INDUCTIVE DIATHERMY EFFECTS

By M. Parise and S. Cristina

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Abstract:
A high-order closed-form solution for the specific absorption rate (SAR) distribution induced inside a plane geometry fatmuscle tissue by a shortwave diathermy induction coil is presented. The solution is derived starting from the complete integral expressions for the electromagnetic field components generated by a currentcarrying circular loop located horizontally above a stratified earth. It is valid in a wide frequency range, and is flexible to any multi-turn coil configuration. The spatial distribution of the SAR induced in the muscle tissue by a flat round coil is computed by using the proposed formulation, the zero-order quasi-static one, and the finite difference time domain (FDTD) method. Excellent agreement is demonstrated to exist between the results provided by the new approach and those achieved through FDTD simulations. On the contrary, the performed computations show that the zero-order solution leads to over-estimate the SAR. The performances of the round and figure-eight coil geometries are compared. Despite of what has been argued in previously published papers, it turns out that the figure-eight coil is less energetically efficient than the round one. The work in the present paper is an extension of a previous work.

Citation:
M. Parise and S. Cristina, "High-order electromagnetic modeling of shortwave inductive diathermy effects," Progress In Electromagnetics Research, Vol. 92, 235-253, 2009.
doi:10.2528/PIER09022608
http://www.jpier.org/PIER/pier.php?paper=09022608

References:
1. Hill, J., M. Lewis, P. Mills, and C. Kielty, "Pulsed shortwavediathermy effects on human fibroblast proliferation," Arch. Phys. Med. Rehabil., Vol. 83, No. 6, 832-836, 2002.
doi:10.1053/apmr.2002.32823

2. Santoro, D., L. Ostrander, B. Y. Lee, and B. Cagir, "Inductive 27.12 MHz diathermy in arterial peripheral vascular disease," EMBS 1994, Proc. IEEE 16th Annual Intern. Conf., Vol. 2, 776-777, 1994.

3. Guy, A.W., J. F. Lehmann, and J. B. Stonebridge, "Therapeutic applications of electromagnetic power," Proceedings of the IEEE, Vol. 62, No. 1, 55-75, 1974.
doi:10.1109/PROC.1974.9385

4. Rhattoy, A., S. Bri, and M. Audhuy-Peudecedery, "Coaxial antenna for microwave hyperthermia," Journal of Electromagnetic Waves and Applications, Vol. 19, No. 14, 1963-1971, 2005.
doi:10.1163/156939305775570585

5. Rajhi, A., "Optimization of the EM heating cycle by using a dual frequency local hyperthermia applicator," Journal of Electromagnetic Waves and Applications, Vol. 17, No. 3, 447-464, 2003.
doi:10.1163/156939303767868946

6. Wu, M. S., K. Ito, and H. F. Kasai, "Analysis of current and electric field distributions of coaxial-slot antenna for interstitial microwave hyperthermia," Journal of Electromagnetic Waves and Applications, Vol. 9, No. 5–6, 831-849, 1995.
doi:10.1163/156939395X00938

7. Kerem, M. and K. Yigite, "Effects of continuous and pulsed shortwave diathermy in low back pain," The Pain Clinic, Vol. 14, No. 1, 55-59, 2002.
doi:10.1163/156856902760189188

8. Sciuto, M. G., C. Zanon, A. Mussa, R. Clara, M. Bortolini, A. Malossi, R. Moscato, P. Celoria, M. De Andrea, M. Rizzo, and I. Chiapp, "Chemohyperthermia for advanced abdominal malignancies: A new procedure with closed abdomen and previously performed anastomosis," International Journal of Hyperthermia, Vol. 17, No. 5, 456-464, 2001.
doi:10.1080/02656730110068311

9. Curto, S. and M. J. Ammann, "Electromagnetic coupling mechanism in a layered human tissue model as reference for 434MHz RF medical therapy applicators," Proc. 2007 IEEE Antennas and Propagation Society International Symposium, Vol. 1, 3185-3188, 2007.
doi:10.1109/APS.2007.4396213

10. Ren, C., P. P. Tarjan, and D. B. Popovic, "A novel electric design for electromagnetic stimulation — The slinky coil," IEEE Trans. Biomed. Eng., Vol. 42, No. 9, 918-925, 1995.
doi:10.1109/10.412658

11. Nyenhuis, J. A., G. A. Mouchawar, J. D. Bourland, and L. A. Geddes, "Energy considerations in the magnetic (Eddycurrent) stimulation of tissues," IEEE Trans. Magnetics, Vol. 27, No. 1, 680-687, 1991.
doi:10.1109/20.101117

12. Esselle, K. P. and M. A. Stuchly, "Quasi-static electric field in a cylindrical volume conductor induced by external coils," IEEE Trans. Biomed. Eng., Vol. 41, No. 2, 151-158, 1994.
doi:10.1109/10.284926

13. Schnabel, V. and J. J. Struijk, "Calculation of electric fields in a multiple cylindrical volume conductor induced by magnetic coils," IEEE Trans. Biomed. Eng., Vol. 48, No. 1, 78-86, 2001.
doi:10.1109/10.900251

14. Singh, N. P. and T. Mogi, "Electromagnetic response of a large circular loop source on a layered earth: A new computation method," Pure and Applied Geophysics, Vol. 162, No. 1, 181-200, 2005.
doi:10.1007/s00024-004-2586-2

15. Gustavsen, B. and A. Semlyen, "Rational approximation of frequency domain responses by vector fitting," IEEE Trans. Power Delivery, Vol. 14, No. 3, 1052-1061, 1999.
doi:10.1109/61.772353

16. Cristina, S. and M. Parise, "Closed-form expression of the SAR distribution in a multilayered planar model for shortwave inductive diathermy ," Proc. IEEE 1st Intern. Conf. Bio. Medical Engineering & Informatics, Vol. 2, 577-582, 2008.
doi:10.1109/BMEI.2008.221

17. Guptasarma, D. and B. Singh, "New digital linear filters fo Hankel J0 and J1 transforms," Geophysical Prospecting, Vol. 45, No. 5, 745-762, 1997.
doi:10.1046/j.1365-2478.1997.500292.x

18. Kong, F. N., "Hankel transform filters for dipole antenna radiation in a conductive medium," Geophysical Prospecting, Vol. 55, No. 1, 83-89, 2007.
doi:10.1111/j.1365-2478.2006.00585.x

19. Felsen, L. B. and N. Marcuvitz, Radiation and Scattering of Waves, IEEE Press, Piscataway, NJ, 1994.

20. Marsden, J. E. and M. J. Hoffman, Basic Complex Analysis, W. H. Freeman and Company, New York, 1998.

21., "Tissue dielectric properties,", Federal Communications Commission, Washington, DC [Online], http://www.fcc.gov/fccbin/dielec.sh.


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