The difference between a Radiographer and a Radiologist is the Radiographers are health professionals who have the knowledge and understanding required to use and manipulate radiographic equipment and complex medical imaging technology to generate a variety of images for subsequent interpretation and storage. They work as part of a medical imaging team. Using x-ray film-based imaging, radiographers select and implement the most appropriate examination protocol which will deliver the lowest possible dose of radiation to the patient. The radiologist is the medically qualified practitioner who prepares a formal medical report on the images created by the radiographer. Radiologists also perform procedures such as barium studies and angiograms.
Things have changed a lot since that definition and in most health authorites radiographers are trained to issue reports in most fields of radiology and to carry out examinations such as barium enemas, ultra sound, CT and Nuclear medicine examinations. The role of a Radiologist is increasingly to be involved in treating/interventional work requiring a medically qualified practitioner- eg embolising a kidney- inserting a stent etc
A radiologist is a medical doctor while a radiographer is not. He is only a health professional in that sphere but not a physician.