Pedunculopontine Nucleus Transcranial Ultrasound Stimulation as a Treatment of Freezing of Gait in Parkinson's Disease

Inclusion Criteria: * 18-90 years of age * Confirmed diagnosis of a movement disorder with Freezing of Gait * Stable dopaminergic medication dose for a minimum of 4 weeks Exclusion Criteria: * History of stroke or seizure * Comorbid dementia * Scored below 22 on the Montreal Cognitive Assessment (MoCA) * Has intracranial implant(s) or device(s) * Has an implanted cardiac pacemaker or implantable cardioverter-defibrillator (ICD) * Has a previous surgical intervention to treat the movement disorder such as lesioning or a DBS system in place. * Presence of metal implanted in body that is contraindicated in TMS/MRI * Pregnancy * Major depression/psychiatric disorder that in the opinion of the Investigator will affect patient's understanding of study procedures and willingness to abide by all procedures during the course of the study * Is on antipsychotics, marijuana, or other recreational drugs that affect the nervous system * Major musculoskeletal or neuromuscular disease or disorder of the hands, wrists and limbs * Major systemic illness or infection