I suffer from moderate depression and benign essential tremor and want to undergo brain scans to determine brain disease. should i and which ones ?

Go to your doc: Tests are very rarely abnormal and are usually unnecessary, Your primary doc should do a compete regualar and neurologic exam and refer you to a neurologist if he finds anything. MRI of the Brain with and without contrast are the most common, but without a definite need you'll be wasting money and time.

Doubt helpfulll: with both of these conditions, MRI and other brain scan studies are usually normal. These are clinical diagnosis, meaning that we make the diagnosis based on history and exam. No markers for these condtions