[Thermometry of hyperthermia].

Invasive thermometers with a thermo-couple or an optical fiber are widely employed in hyperthermia treatment. A non-invasive method is wanted, but we can not present one at present. Several results obtained in Japan on studies of non-invasive thermometry are as follows: Mizushina, after simultaneous measurement of microwave radiation of the three frequencies located between 1 to 4 GHz, determined in real-time temperature dependence on depth to 5 cm beneath the skin of a rabbit, Yamaura, with his 915 MHz-CT apparatus, obtained 0.4 degree C temperature resolution on the phantom made of a hot cylinder in a cool tank both filled with NaCl solution, and Amemiya et al., assuming use of an NMR apparatus, showed theoretically that temperature could be measured after about 1 minute with the error of +/- 0.5 degree C if one measures M0 parameter in focusing magnetic field mode.