ABSTRACT
This chapter provides brief overview of the various types of hyperthermia systems that are being used in the clinic or are under development. The rationale for regional hyperthermia systems is that in many cases it is difficult if not impossible to actually define the tumor volume. It is desirable to have systems which will deposit power in the general region of interest with the hope that the tumor volume will come to therapeutic temperatures. The design work for hyperthermia systems has concentrated on applicators for superficial tumors. There are three invasive hyperthermia systems presently under investigation: interstitial microwave antennas, interstitial radiofrequency (RF) needles, and ferromagnetic seeds. The RF currents between the planes of needles create joule heating within the tumor. The concept of regional hyperthermia has progressed rapidly over the last few years with the development of magnetic induction and microwave annular phased array systems. There is a need for much greater interaction among hyperthermists, radiation therapists, surgeons, and neurosurgeons.
