Ultrasonic Tomography for Differential Thermography

This paper describes work in progress in the study of ultrasound computer aided tomography (UCAT) and its application to differential thermography. There are many situations in which it is desirable to determine the amount of induced heating generated by applied hyperthermia (microwave or ultrasound). However, it is not always possible or safe to insert a temperature sensitive probe into the subject. The application of assessing tissue temperature from the temperature dependence of ultrasonic speed has been suggested by others (Bowen et al., 1979; Nasoni et al., 1979; Rajagopalan et al., 1979). But it may be possible to refine the assessment of temperature change from the simultaneous determination of the acoustic speed and the ultrasonic attenuation coefficient. A method is outlined for producing maps of temperature change after heating.