Imaging Biomarkers of FOG Response to DBS

This study is using advanced brain imaging to understand why some people with Parkinson's disease experience "freezing of gait" (FOG) — a sudden inability to move the feet while walking — and whether deep brain stimulation (DBS) surgery can reduce this symptom. The goal is to identify brain imaging markers that predict how well DBS will help with FOG. **You may be eligible if...** - You are over 40 years old - You have been diagnosed with Parkinson's disease - You experience freezing of gait episodes and this has been confirmed by testing - You have been selected to undergo deep brain stimulation (DBS) surgery at MUSC **You may NOT be eligible if...** - You have significant walking difficulties caused by something other than Parkinson's (such as a joint problem) - You cannot complete walking tests on your own (without assistance or walking aids) - You cannot undergo an MRI scan (due to metal implants, pregnancy, or inability to lie still) - You will be receiving a type of DBS device that is not compatible with 3T MRI Talk to your doctor to see if this trial is right for you.