Perturbation of the temperature distribution in microwave irradiated tissue due to the presence of metallic thermometers

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Abstract
To date, satisfactory thermal dosimetry during the clinical application of localized hyperthermia can ony be achieved using invasive thermometry. However, the presence of commonly used metallic thermometers, such as thermocouples, may lead to the distortion of the temperature field due to self-heating of the probe under microwave irradiation. A computer simulation of the effect of this self heating on the steady-state temperature distribution in plane-microwave irradiated homogeneous tissue has been undertaken and the significance of the effect for clinical hyperthermia dosimetry is assessed. The results indicate that distortion of the temperature field in the neighborhood of the thermometer by several degrees can occur under adverse conditions.

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