While the scope of this thread does not include proofreading, I will make some general comments about research entries for everyone's sake:
The ability to explain one's research in lay terms is desirable and the Research description is a good place to start. Keep your potential audience in mind. Everyone reading your application will not have an upper-level science background, eg administrators and non-science faculty. At the beginning, I would start with something more generally understandable (like your second sentence). After that, technical details are fine. Also, one should spell out all but the most universal of acronyms the first time they are used. Do you think the prof teaching Statistics will necessarily know what PET stands for? MRI, OTOH, is probably OK to use.
Thanks for your feedback.. so for general form for a research experience it should be :
1. Goal of study in lay terms
2. Technical details
3. Your specific role in the study?
Is this what they are looking for??