In your other post you mentioned you are a high school student interested in doing a science project in radiology.
The problem with this is that radiology research requires an enormous amount of background knowledge to get to the level where you can conduct meaningful research. It would certainly be beyond the scope of a high school research project.
The only thing I can think of is a study which compares different non-medication based methods of calming patients before being inserted into MRI machines (ie, allowing them to see a video vs just explaining the procedure). A major obstacle to even such a simple study would be that you would have difficulty finding a radiology imaging facility which would allow you to conduct such research.