Multifrequency microwave radiometry for atraumatic control of temperature in cryotherapy treatments

The use of microwave radiometry is a new way allowing the non invasive control of internal temperatures and also the regulation of the flow of the gaseous nitrogen in order to obtain the required temperature in depth. The purpose of this paper is to give the first results which show the feasibility of this new technique of control of temperatures by the use of two radiometers working around 3 and 9 GHz. The antenna used for the temperature measurement is a planar one ( slot antenna), light and not very bulky and which is applied on the muscular zone to be cooled.