Radiologic technologists, better known as radiographers, are the medical personnel who perform diagnostic imaging examinations, including X-rays. Radiographers who perform imaging examinations are responsible for accurately positioning patients and ensuring that a quality diagnostic image is produced. They work closely with radiologists, the physicians who interpret medical images to either diagnose or rule out disease/injury. For the images to be interpreted correctly by the radiologist, the imaging examinations must be performed properly and competently by the imaging experts, the radiographer. They may specialize in specific imaging techniques such as bone densitometry, cardiovascular-interventional radiography, computed tomography, mammography, magnetic resonance imaging, nuclear medicine, quality management, sonography or general diagnostic radiography. Hospitals are the primary employer of radiologic technologists, but a greater number of new jobs will be found in physicians' offices and diagnostic imaging centers.