The radiologist is a medical doctor who has completed a four-year residency in either diagnostic radiology or radiation oncology. Following the residency, most radiologists and radiation oncologists become board-certified by the American Board of Radiology. Some go directly into practice. An example is an obstetrician who performs a routine ultrasound on a pregnant woman. Technologists, who are specially trained to perform specific imaging techniques and are certified by the American Registry of Radiologic Technologists, or another registry.
Technologists work under the direction and supervision of the radiologist.
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