Radiologist
A radiologist specializes in radiology or medical imaging technologies to diagnose and sometimes treat diseases. These imaging technologies include x-ray machines, ultrasound, computed tomography (CT) and magnetic resonance imaging (MRI). As a medical specialty, radiology can be classified into 5 subfields. Diagnostic radiology is concerned with the use of various imaging modalities to aid in the diagnosis of disease. Interventional radiology uses imaging to guide therapeutic procedures. Neuroradiology is concerned with central nervous system imaging. Interventional Neuroradiology uses imaging to guide therapeutic procedures in the head, neck and spine. Radiation therapy uses radiation to treat diseases such as cancerReference: http://en.wikipedia.org/wiki/Radiologist