Helen Rumsey has lived with essential tremor for more than 20 years, causing her hands to shake so much that eating and drinking, writing her name and other daily tasks most people take for granted became impossible without help from loved ones. Last week, Helen became the 100th patient treated by the Sharp Grossmont Hospital for Neuroscience team using MR-guided focused ultrasound, a revolutionary technology for conditions such as essential tremor and Parkinson’s disease. Focused ultrasound, a