Radiologist
 Radiologists are physicians who use medical imaging technologies to diagnose and sometimes treat diseases. Radiology that involves use of x-ray is called roentgenology. Today, following extensive training, radiologists direct an array of imaging technologies (such as ultrasound, computed tomography (CT) and magnetic resonance imaging) to diagnose or treat disease. Interventional radiology, which is minimally invasive, is the performance of medical procedures with the guidance of imaging technologies. The acquisition of medical imaging is usually carried out by the radiographer or radiologic technologist.
Outside of the medical field, radiology also encompasses the examination of the inner structure of objects using X-rays or other penetrating radiation.
As a medical specialty, radiology can be classified into subfields:
- Diagnostic radiology is concerned with the use of various imaging modalities to aid in the diagnosis of disease. Therapeutic Radiology utilizes radiation for therapy of disease.
- Interventional radiology uses imaging to guide therapeutic procedures.
- Neuroradiology is the sub-specialty in the field of Central nervous system imaging.
- Interventional Neuroradiology uses imaging to guide therapeutic procedures in the head, neck and spine.
- Musculoskeletal radiology is the sub-specialty in the field of bone, joint and muscular imaging.
- Pediatric Radiology. This is a subspecialty of Radiology that specializes in the imaging of children and adolescents.
- Nuclear Medicine. This is a subspecialty of Radiology that uses radioisotopes in the characterization of lesions and disease processes, and often yields functional information.
- Radiation therapy uses radiation to treat diseases such as cancer. While originally encompassed within radiology, radiation oncology is now a separate field.
- Other subspecialties are divided by anatomic section: Chest, Abdomen, Musculoskeletal, Genitourinary, in many hospitals Neuroradiology and Interventional Neuroradiology are within the same Neurology subspecialty.
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