Thoughts on ultrasonic cavitation or radiation for fat loss treatment? any risks/harm?

It is not a reliable way for losing fat unless you combine with diet (cut down total calories intake) and exercise. Ultrasonic cavitation is a safe FDA approved procedure. Since the procedure is non-invasive, there is no downtime needed. The destroyed fat cells do not grow back so the results of ultrasonic cavitation can last with continued weight maintenance activities as noted above.