What is your goal?
If you want to read a book to impress the faculty, that is impossible. You can not do it by reading the books. BUT you can really be helpful by looking up patient's H&P, talking to clinician's, answering the phones and do small things that come by.
We had an MS rotating with us who did not know anything about radiology (as expected), BUT used to look up all the patient's Notes, call the clinician's, search internet for questions we had and do things that used to come by. At the end of the rotation everybody gave him strong recommendation for being accepted to our program.
If you want to obtain some understanding on what going on, use UVA radiology site. it is free and have some of the most common things.