Hi, I am pre-rad 4th year med student and wish I had bought a copy of Squire's Fundamentals of Radiology sooner. It's so easy to read, but also in depth (but not too in depth).
If your radiology rotation is only 2 weeks this is too much. But if you're driven and you understand the value of having a good foundation in radiology (regardless of your future specialty), then you'll find this book useful not only for success in clinical years but also for your residency.