A Radiologist is a physician who interprets x-rays, performs diagnostic studies of x- ray films, ultrasound and nuclear medicine.

Radiologists are licensed to administer X-ray, radium, or radio-active isotopes therapy.  They are certified by the American Board of Radiology. A physician who specializes in using imaging techniques (eg x-rays, CT scans, ultrasound) to diagnose and treat disease.

A physician specialized in radiology, the branch of medicine that uses ionizing and nonionizing radiation for the diagnosis and treatment of disease. Like other physicians, a radiologist must have graduated from an accredited medical school or school of osteopathy, passed a licensing examination, and completed at least 4 years of graduate medical or osteopathic education.

Radiology is the branch of medical science dealing with the medical use of x-ray machines or other such radiation devices for the purpose of obtaining visual information as part of medical imaging. Interventional radiology is the performance of medical procedures with the help of medical imaging.