Multifrequency microwave radiometry for atraumatic control of temperature in cryotherapy treatments

For a long time, the treatment by cryotherapy of fractures, pulled muscles or osteoarthritis was consisting in the application of an ice bolus on the zone to be treated. However the duration of the treatment is not long enough in order to reach the wanted internal temperatures. Now, we can make use of a more efficient technology by pointing a gaseous flux of nitrogen at the zone to be cooled. But for this technique the control of temperatures is obtained only superficially with thermocouples and we can not have any control in depth: so, the duration of the treatment is estimated by empirical manner.