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A remark up front: I am not a specialist on ultrasound. However, I am a Geophysicist and we use more or less the same principle to image the Earth's interior, just a very different frequency range compared to your problem at hand; in exploration seismics typically 5-100Hz compared to frequencies in the Megahertz range for ultrasound imaging. A transducer ...

Your description of the basal metabolic rate is spot on, and it is indeed equated with the amount of heat you give off. The way to look at this is yesterday I weighed 60kg and today I weigh 60kg, but in between I've consumed about 2,500 calories. That energy must have gone somewhere. Since I'm the same today as I was yesterday there's no net energy change ...

There is no direct conversion for what you are asking. Curies are a measure of activity equal to $3.7 \cdot 10^7$ decays per second. Rad are a measure of absorbed dose equal to 1 Joule per kilogram. In order to determine how much radiation is received, you need to know things like the amount of time of exposure, distance between source and target, ...