This info was provided on one of the webs link that Soccertese posted:
http://www.fusfoundation.org/disease...nsonian-tremor


Focused ultrasound is being studied to treat two symptoms of Parkinson’s through lesioning of one of two target areas of the brain:

Parkinsonian tremor – lesioning target in the thalamus (thalatomy)
Parkinsonian dyskinesia – lesioning target in the globus pallidus (pallidotomy) or subthalamic nucleus
At this time, focused ultrasound is only being assessed to treat one side of the brain, so it will affect tremor or dyskinesia unilaterally.