Desenvolvimento de um protótipo de sistema de hipertermia por micro-ondas.

Abstract

The present work is directed toward the development of a microwave driven hyperthermia induction system. The fundamentals of the interaction of an electromagnetic field with a biological tissue are shown, including the heating process related to the relaxation mechanisms. Some aspects of radiofrequency exposure standards are also discussed, mainly those related to the maximum exposure levels to electromagnetic fields. A review about the theory of operation of the magnetron valve is presented, including the principles of oscillation, the electromagnetic energy coupling systems, performance charts and means of varying the output power. The main features of a clinical hyperthermia system are reviewed, mainly the thermometry and heat induction subsystems. Some types of heat induction devices are presented, and the underlying principles are then employed in the development of a 2450 MHz prototype. Finally, the procedures adopted in developing the prototype are indicated, as well as some preliminary results of a test conducted in a simulated environment. The main aspects related to the use of the system, and some observations concerning its operation, can be found at the conclusion.