Radiology involves the diagnosis and treatment of diseases through imaging. It is a 4+1 residency. 1 year of clinical training in internship, followed by a comprehensive study in radiation,physics,pathology, and various modalities. Call during residency is busier than most specialties since you are paged to do emergency readings and interventions, if you are at a level I trauma center.
The best comprehensive description is in medschool.com. There is a big demand for radiology, right now, because of a mass exodus in the late 90s secondary to HMO-ization.
Keep in mind it is a 5 year residency, and it does involve a lot of reading and self study. You dx diseases based presentations on images. You must also have an understanding of other specialties such as surgery, pediatrics, internal medicine, critical care, and orthopedics.
