Evaluation of Specific Absorption Rate due to Medical Implant in Near-Field Exposure
DOI:
https://doi.org/10.11113/jt.v64.2074Keywords:
SAR (Specific Absorption Rate), electromagnetic wave, conductive medical implant, energy absoprtionAbstract
This paper presents the effects of conductive medical implant on energy absorbed by the human body and the testicular area when exposed to near field electromagnetic radiation. A dipole antenna is used as the radiating source and it is placed in front of the trousers pocket. Two types of medical implants are used in this study: intramedullary nail and bone plate. Numerical simulations are performed by means of CST Microwave Studio. Results are discussed in terms of changes in SAR values due to the presence of conductive medical implant at 0.4, 0.9, 1.8 and 2.4 GHz. The results have indicated that the conductive intramedullary nail that is located inside the femur significantly increases the SAR. Maximum enhancement in SAR is found when the length of the intramedullary nail is approximately one wavelength of the respective frequency tested. The measurement results indicate good agreements with the simulation results at 2.4 GHz.
References
Hadjem, A., Conil, E., Gati, A., Man-Fai, W. and Wiart, J. 2010. Analysis of Power Absorbed by Children's Head as a Results of New Usage of Mobile Phone. IEEE Transactions on Electromagnetic Compatibility. 52: 812–819.
Salah, I. A. and Marai, M. A. 2008. Anticipated Impact of Hand-hold Position on the Electromagnetic Interaction of Different Antenna Types/Positions and a Human in Cellular Communications. International Journal of Antennas and Propagation.
Krstic, D., Zigar, D. Petkovic D. and Sokolovic, D. 2011. Calculation of Absorbed Electromagnetic Energy in Human Head Radiated by Mobile Phones. International Journal of Emerging Science. 14: 526–534.
Akinomoto, S., Kikuchi, S., Nagaoka, T., Saito, K., Watanabe, S., Takahashi, M. and Ito, K. 2010. Evaluation of Specific Absorption Rate for a Fetus by Portable Radio Terminal Close to the Abdomen of a Pregnant Woman. IEEE Transactions on Microwave Theory and Techniques. 58: 3859–3856.
Teerapot, W., Siramate, S. and Phadungsak, R. 2012. Specific Absorption Rate and Temperature Distributions in Human Head Subjected to Mobile Phone Radiation at Different Frequencies. International Journal of Heat and Mass Transfer. 55: 347–359.
Amreeta, G. and Frank, G. S.2012. Analysis Assessment of MRI Issues at 3-Tesla for Metallic Surgical Implants: Findings Applied to 61 Additional Skin Closure Staples and Vessel Ligation Clips. Journal of Cardiovascular Magnetic Resonance. 14: 3.
Virtanen, H., Keshvari, J. and Lappalainen, R. 2007. Analysis the Effect of Authentic Metallic Implants on the SAR Distribution of the Head Exposed to 900, 1800 and 2450 MHz Dipole Near Field. Physics in Medicine and Biology. 52: 1221–1236.
Fayos-Fernandez, J., Arranz-Faz, C., Martinez-Gonzalez, A. M. and Sanchez-Hernandez, D. 2006. Effect of Pierced Metallic Objects on SAR Distributions at 900 MHz. Bioelectromagnetics. 27: 337–353.
Whittow, W. G., Edwards, R. M., Panagamuwa, C. J. and Vardaxoglou, J. C. 2008. Effect of Tongue Jewellery and Orthodontist Metallic Braces on the SAR Due to Mobile Phone in Different Anatomical Human Head Models Including Children. Loughborough Antennas & Propagation Conference.
Anuar, M. Z. and e.a, On the Effect of Metallic Earring on Antenna Performance and SAR at 2.4 & 5.8 GHz. Jurnal Teknologi UTM ( Telecomm. Engineering).
Bencsik, M., Bowtell, R. and Bowley, R. 2007. Electric Fields Induced in the Human Body by Time-varying Magnetic Field Gradients in MRI: Numerical Calculations and Correlation Analysis. Physics in Medicine and Biology. 52: 2337–2353.
Virtanen, H., Keshvari, J. and Lappalainen, R. 2006. Interaction of Radio Frequency Electromagnetic Fields and Passive Metallic Implants-A Brief Review. Bioelectromagnetics. 27(6): 431–439.
Nyenhuis, J. A., Kildishev, A. V., Bourland, J. D., Foster, K. S., Graber, G. and Athey, T. W. 1999. Heating Near Implanted Medical Devices by the MRI RF-Magnetic Field. IEEE Transactions on Magnetics. 35: 4133–4135.
Valic, B., Gajsek, P. and Miklavcic, D. 2009. Current Density in a Model of a Human Body with a Conductive Implant Exposed to ELF Electric and Magnetic Fields. Bioelectromagnetics. 30(7): 591–599.
Virtanen, H., Huttunen, J., Toropainen, A. and Lappalainen, R. 2005. Interaction of Mobile Phones with Superficial Passive Metallic Implants. Physics in Medicine and Biology.50: 2689–2700.
2011. Immersible SAR Probe Calibration Report, Indexsar.
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