Dear friends
In my 10 years in this field I have never come accross ultrasonic therapy given for tremors. Hope whoverever has given this statement has got some rationale for it. An I would be delighted to get an explanation.

Though it is true that it is not possible to cure voluntary tremors by Physical therapy. It is possible to overcome the hindrance caused by these tremors during voluntary motion. Cognitive movement execution techniques have found to reduce the effect of tremors on voluntary movement.