Hugo A. Dominguez, Adroaldo Raizer


The Transmission Line Matrix (TLM) method is used to study a noninvasive two-dimensional electric-type hyperthermia applicator. The electric field distribution and the specific absorption rate (SAR) pattern are calculated and graphically displayed for several design variations, showing the fundamental limitation of this kind of applicator: overheating of the fat by normal strong components of electric field. One example of applicator designed to avoid fat overheating is described: a 100 MHz dipole with thick water bolus, utilized for treatment of small tumors at 4-5 cm muscle depth. The results show that the TLM technique is well suited to be used as a tool for designing more efficient stimulation procedures.

Full Text:



J. A. Shaw, C. H. Durney and D. A. Christensen, "Computer-aided design of two-dimensional electric-type hyperthermia applicators using the finite- difference time-domain method," IEEE Trans. Biomed. Eng., vol. 38, no. 9, pp. 861-870, September 1991.

D. R. Lynch, K. D. Paulsen and J. W. Strohbehn, "Finite element solution of Maxwell's equations for hyperthermia treatment planning," J. Comp. Phys., vol. 58, pp. 246-269, 1985.

T. Deng, "Use of the field-iteration method in studying the three-dimensional phased array for electromagnetic hyperthermia, " IEEE Trans. Microwave Theory Tech., vol. 44, no. 10, pp. 1778-1787, October 1996.

J. C. Carmat, D. Despretz, and M. Chivé, "Modeling of various kinds of applicators used for microwave hyperthermia based on the FDTD method, " IEEE Trans. Microwave Theory Tech., vol. 44, no. 10, pp. 1811-1818, October 1996.

C. Christopoulos, The Transmission-Line Modeling Method- TLM, New York: IEEE Press and Oxford University Press, 1995.

D. A. AI-Mukhtar, B. and J. E. Sitch, "Transmission-line matrix method with irregularly graded space," Proc. IEE, vol. 128, no. 6, pp. 299-305, December 1981.

H. A. Domíguez and A. Raizer, "Improvement of the 2-D TLM series node algorithm to allow the modeling of conducting/lossy dielectric material for TE modes," in Proceedings of the IV Brazilian Congress on Magnetism, pp. 130-133, Natal, Brazil, November 2000.


  • There are currently no refbacks.

© Copyright 2007-2016 JMOe Brazilian Microwave and Optoelectronics Society (SBMO) and Brazilian Society of Electromagnetism (SBMag)