V.A. Yolkin1, V.V. Komarov2, V.P. Meschanov3

1,3 NIKA-SVCH Ltd (Saratov, Russia)

2 Yuri Gagarin State Technical University of Saratov (Saratov, Russia)

Local high-temperature heating of damaged biological tissues in the human body by intense electromagnetic radiation is widely used in some medical technologies. In particular, for the treatment of deep-seated malignant tumors, interstitial applicators based on thin coaxial emitters placed in the center of the tumor are used. Usually the entire biological tissue near such an applicator is heated. However, in some cases, it is necessary to treat only limited areas of small-volume biological tissues located near healthy organs. For these purposes, special directional emitters are required, which are different from conventional similar devices. The structure of one of these emitters is considered in the present study. The objective of our work is to study the factors influencing the formation of a thermal field in the radiation zone of a coaxial microwave directional applicator for the thermal treatment of cancerous tumors. A 3D numerical model based on the finite element method of a coaxial-slotted applicator for directed action of intense microwave radiation on damaged bioloical tissues has been developed. Solution of the coupled electromagnetic and thermal conduction problem allowed determining the radiation pattern and temperature distribution in the near zone of such an emitter. The obtained data of numerical simulations make it possible to estimate, as a first approximation, the possibility of implementing a specialized microwave applicator for a narrowly directed effect of electromagnetic energy on local areas of biological tissues.

Yolkin V.A., Komarov V.V., Meschanov V.P. Thermal field distribution in the near zone of a coaxial-slot directional emitter for microwave thermal destruction of tumor. Achievements of modern radioelectronics. 2022. V. 76. № 6. P. 26–32. DOI: https://doi.org/ 10.18127/j20700784-202206-03 [in Russian]

1. Moskvicheva L.I., Sidorov D.V., Lozhkin M.V. et al. Modern methods of ablation of liver tumors. Research'n Practical Medicine Journal. 2018. T. 5. № 4. S. 58–71.
2. Zayganov V.E. Sverkhvysokochastotnaya termoablyatsiya v khirurgii metastazov kolorektal'nogo raka. Annaly khirurgicheskoy gepatologii. 2012. T. 17. № 3. S. 28–34. [in Russian]
3. Makarov V.N., Yushchenko G.V. Sravnitel'nyy analiz mikrovolnovogo i radiochastotnogo nagreva pri teplovoy ablyatsii opukholey. Biomeditsinskaya radioelektronika. 2009. № 2. S. 3–10. [in Russian]
4. Kikuchi S., Saito K., Takahashi M., Ito K. Control of heating pattern for interstitial microwave hyperthermia by a coaxial-dipole antenna - aiming at treatment of brain tumor. Electronics and Communications in Japan. 2007. V. 90. № 12. P. 31–38.
5. Longo I., Gentili G.B., Cerretelli M., Tosoratti N. A coaxial antenna with miniaturized choke for minimally invasive interstitial heating. IEEE Transactions on Biomedical Engineering. 2003. V. 50. № 1. P. 82–88.
6. Komarov V.V., Novruzov I.I. Analiz elektromagnitnykh i teplovykh poley interstitsial'nogo mikrovolnovogo applikatora. Biomeditsinskaya radioelektronika. 2011. № 4. S. 57–62. [in Russian]
7. Keangin P., Rattanadecho P., Wessapan T. An analysis of heat transfer in liver tissue during microwave ablation using single and double slot antenna. International Communications in Heat and Mass Transfer. 2011. V. 38. P. 757–766.
8. Kim D., Kim K., Oh J. et al. A K-band planar active integrated bi-directional switching heat applicator with uniform heating profile. IEEE Transactions on Microwave Theory and Techniques. 2009. V. 57. № 10. P. 2581–2587.
9. Pfannenstiel A., Iannuccilli J., Cornelis F.H. et al. Shaping the future of microwave tumor ablation: a new direction in precision and control of device performance. International Journal of Hyperthermia. 2022. V. 39. № 1. P. 664–674.
10. Baskakov S.I. Elektrodinamika i rasprostranenie radiovoln. M.: Knizhnyy dom Librokom. 2012.
11. Volakis J.L., Chatterjee A., Kempel L.C. Finite element method for electromagnetics. New York: IEEE Press. 1998.
12. Metaxas A.C., Meredith R.J. Industrial microwave heating. London: Peter Peregrinus Ltd. 1983.
13. Komarov V.V. Handbook of dielectric and thermal properties of materials at microwave frequencies. London: Artech House. 2012.
14. Teplotekhnika. Pod red. V.N. Lukanina. M.: Vysshaya shkola. 2002. [in Russian]