volume | PIER Journals

Abstract

Water bolus is used in microwave hyperthermia of cancer treatment to control the body surface temperature. In this paper the effect of water bolus on SAR distribution is investigated in the muscle layer of a three layered tissue model. Both the SAR penetration depth and the effective field size (EFS) are computed and compared in presence and in absence of the water bolus. Results are provided for distilled and fresh water with three different thicknesses of water bolus. All numerical simulations are performed using the Ansoft HFSS software. Numerical simulation results are in good agreement with published results.

1. Wost, P., B. Hildebrandt, G. Sreenivasa, B. Rau, J. Gellermann, H. Riess, R. Felix, and P. M. Schlag, "Hyperthermia in combined treatment of cancer," The LANCET Oncology, Vol. 3, 487-497, 2002.
doi:10.1016/S1470-2045(02)00818-5 Google Scholar

2. Juang, T., D. Neuman, J. Schlorff, and P. R. Stauffer, "Construction of a conformal water bolus vest applicator for hyperthermia treatment of superficial skin cancer," IEEE Engineering in Medicine and Biology Society, Vol. 2, 3467-3470, 2004. Google Scholar

3. Vorst, A. V., A. Rosen, and Y. Kotsuka, RF/Microwave Interaction with Biological Tissues, John Wiley, 2006.

4. Ibrahiem, A. and C. Dale, "Analysis of the temperature increase linked to the power induced by RF source," Progress In Electromagnetics Research, Vol. 52, 23-46, 2005.
doi:10.2528/PIER04062501 Google Scholar

5. Siauve, N., L. Nicolas, C. Vollaire, A. Nicolas, and J. A. Vasconcelos, "Optimization of 3-D SAR distribution in local RF hyperthermia," IEEE Trans. on Magnetics, Vol. 40, No. 2, 1264-1267, 2004.
doi:10.1109/TMAG.2004.825432 Google Scholar

6. Samaras, T., P. J. M. Rietveld, and G. C. van-Rhoon, "Effectiveness of FDTD in predicting SAR distributions from the Lucite cone applicator," IEEE Trans. on MTT, Vol. 48, No. 9, 1522-1530, 2000.
doi:10.1109/22.869003 Google Scholar

7. Gupta, R. C. and S. P. Singh, "Analysis of the SAR distributions in three-layered bio-media in direct contact with a water-loaded modified box-horn applicator," IEEE Trans. on MTT, Vol. 53, No. 9, 2665-2671, 2005.
doi:10.1109/TMTT.2005.854209 Google Scholar

8. Lumori, M. L. D., "Experimentally based modeling of field sources for tree-dimensional computation of SAR in electromagnetic hyperthermia and treatment planning," IEEE Trans. on MTT, Vol. 48, No. 9, 1522-1530, 2000.
doi:10.1109/22.869003 Google Scholar

9. Gupta, R. C. and S. P. Singh, "Elliptically bent slotted waveguide conformal focused array for hyperthermia treatment of tumors in curved region of human body," Progress In Electromagnetics Research, Vol. 62, 107-125, 2006.
doi:10.2528/PIER06012801 Google Scholar

10. Gupta, R. C. and S. P. Singh, "Development and analysis of a microwave direct contact water-loaded box-horn applicator for therapeutic heating of bio-medium," Progress In Electromagnetics Research, Vol. 62, 217-235, 2006.
doi:10.2528/PIER06031201 Google Scholar

11. Gelvich, E. A. and V. N. Mazokhin, "Resonance effects in applicator water boluses and their influence on SAR distribution patterns," International Journal of Hyperthermia, Vol. 16, 2000. Google Scholar

12. Neuman, D. G., P. R. Stauffer, S. Jacobsen, and F. Rossetto, "SAR pattern perturbations from resonance effects in water bolus layers used with superficial microwave hyperthermia applicators," International Journal of Hyperthermia, Vol. 18, 2002. Google Scholar

13. Gabriel, C., S. Gabriel, and E. Corthout, "The dielectric properties of biological tissues: I. Literature survey," Phys. Med. Biol., Vol. 41, 2231-2249, 1996.
doi:10.1088/0031-9155/41/11/001 Google Scholar

14. Gabriel, C., Compilation of the dielectric properties of body tissues at RF and microwave frequencies, Brooks Air Force Base Tech. Rep. AL/OE-TR-1996-0037, Armstrong Lab., Brooks Air Force Base, TX, June 1996.

15. Jacobsen, D. G. and P. R. Stauffer, "Multifrequency radiometric determination of temperature profiles in a lossy homogeneous phantom using a dual-mode antenna with integral water bolus," IEEE Trans. on MTT, Vol. 50, No. 7, 1737-1746, 2002.
doi:10.1109/TMTT.2002.800424 Google Scholar

16. Maccarini, P. F., H. O. Rolfsnes, D. Neuman, and P. Stauffer, "Optimization of a dual concentric conductor antenna for superficial hyperthermia applications," IEEE Engineering in Medicine and Biology Society, Vol. 1, 2518-2521, 2004. Google Scholar

17. Deng, T., "Optimization of SAR distributions in liver and lung regions irradiated by the H-horn annular phased array hyperthermia system," IEEE Trans. on MTT, Vol. 39, No. 5, 852-856, 1991.
doi:10.1109/22.79113 Google Scholar

Mr. Mohammad Ali Ebrahimi-Ganjeh

Dr. Amir Attari