Ahh, a radiologist is someone with a medical degree that speciaises in the MRS (Medical Radiation Science) which invovle CT scans, MRI, X-Ray etc etc. Radiology deals with the medical side of things that utilises radition to treat and diagnose cancer/problems.
Whereas a radiographer translate doctors' request into images. They pretty much assist e.g cardiologist in imaging a patient's heart or help surgeons during operations or work closely with radiologist in imaging.
They do the analysis and the radiologist does the interpreting.