the sites for the first stage of the project , called the pegasus project , are duke university medical center , durham , n.c. ; emory university , atlanta ; johns hopkins medical institutions , baltimore ; mallinckrodt institute of radiology at washington university medical center , st. louis ; mayo clinic , rochester , minn. ; university of california at los angeles medical imaging division , department of radiological sciences , los angeles ; and the university of alabama cardiovascular nuclear magnetic resonance lab , birmingham .