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Since 2003 the radiologist assistant (RA) was introduced in response to the severe shortage of radiologists and the increased demand for medical imaging services. Other non-physician clinicians, such as PAs, currently play an important role in the medical imaging environment. The article discusses the reasons physician assistants have found favor with interventional radiologists, and advocates an increased role for physician extenders in Radiology. It refutes the skeptics who question whether the new profession will alleviate the manpower crisis in Radiology. The authors suggest that RAs are the ideal complement to radiologists; and based on their radiologic technology background, have a vested interest in the field. [ABSTRACT FROM AUTHOR]