2. 電磁波加温における温度計測 : I. ハイパーサーミアの現状と問題点 : 第42回総会シンポジウム

抄録

The applicability and accuracy of a thermometer in electromagnetic heating were investigated and technical problems in both the phantom experiments and clinical hyperthermia were discussed with special reference given to thermometry. 1. Thermocouples and thermistors often indicate erroneous temperatures in the electromagnetic fields ; however, thermometry and thermistors often indicate erroneous temperatures in the electromagnetic fields ; however, thermometry with sufficient accuracy for clinical purpose was possible by the combined use of the appropriate methods to reduce the effect of electromagnetic fields to the thermometer. 2. A phantom experiment was performed to obtain SAR (specific absorption rate) distribution, which is necessary for estimation of temperature distribution and comparison of equipment and methods for heating. The heating time and the interval between heating and thermometry must be as short as possible to approximate the temperature distribution to SAR distribution. The standard phantom of definite composition, volume and shape is necessary for a comparison and the refernce point for the display of distribution must be defined. 3. Knowledge of temporal and three-dimensional temperature distribution in the treatment volume is important for clinical hyperthermia. However, the invasive thermometry, which is now performed, cannot provide sufficient data due to the limited number of measured points. What we have to do now is to obtain as much temperature data as possible and accumulate them. They will become the basic data to improve clinical hyperthermia and make quantitative evaluation possible in future.