RAD 1601: EDGE Radiosurgery for Intractable Essential Tremor and Tremor-Dominant Parkinson's Disease

The patient will undergo stereotactic radiosurgery. Radiosurgery is a single non-surgical radiation treatment and will be done as an outpatient procedure. High-energy radiation will be delivered to a small, precise area of the patient's brain using a linear accelerator. A face mask (unframed) will be placed over the patient's face to keep their head from moving during the procedure. During the procedure, the study doctor will confirm the exact location that needs to be treated using x-rays and optical imaging cameras. The face mask will hold the patient's head to prevent it from moving and to focus the x-rays and aim them on a small area in the thalamus of the patient's brain. For most patients, the actual time on the radiosurgery treatment machine is 30 to 60 minutes. The face mask will be removed after the treatment.