These databases assist you to find articles in serials (also known as journals or periodicals).
First - decide on useful and relevant keywords or search terms, for example medical imaging, radiology, MRI.
Next - select a relevant database/s
Suggestion - try different keywords or search terms, for example diagnostic imaging, magnetic resonance imaging, computed tomography, CT scan.
Consider - refining your search. Is there a date Limit? Do you want research articles only?
Need help - ask a Librarian if you are not locating relevant information.