Method and device for determining the local power density in bodies affected by electromagnetic losses in the event of heating using pulsed radio-frequency power

摘要

In the application of microwave hyperthermy there is the problem of determining the local temperature distribution as far as possible without introducing probes. Instead of the normally customary CW hyperthermy, the first step is to apply the same mean power in the form of short pulses. The short pulses generate in the body measurable mechanical shockwaves, even in the case of relatively low mean power densities (cf. microwave hearing effect). The mechanical shockwaves thus generated can be detected using suitable microphones on the surface of the body, and can then be evaluated for the purpose of reconstructing the local source distribution and thus of reconstructing the RF power density distribution.