OP
I attended Scholl at Rosalind Franklin and in our curriculum we spent a large amount of time learning how to methodically assess imaging studies. At the time I attended there were entire classes dedicated to the subject as well as more practical hands on "capstone" rotations to solidify the knowledge. At Scholl we had a large large library of old school films that showed an array of pathology. I spent literally days reviewing every aspect of every one of the thousands of images.
In residency, we reviewed all of the clinic imaging electronically as formal reads could take a while. Additionally we would over read the images for ER staff as non msk radiologist often often miss subtile findings of injuries (Lisfranc, syndesmosis, ect...). There is mounds of emergency med literature confirming the miss rates. In my facility the ER physicians contact the residents directly to do these reads and to provide follow-up recommendations. We also reviewed pre-op imaging for surgical planning on a daily basis. Our Radiology rotation consisted of participating in interventional radiology procedures (stents, plasty, ports, ect...), interventional msk radiology (injections, injections, and more injections), msk radiology (advanced imaging and stat trauma reads), as well as general radiology (ultrasounds and plain films).
You tend to become comfortable with reads fairly quickly.