Physician Specialty Descriptions Following is a list of physician specialties followed by descriptions. Once you find the specialty you are looking for, click on one of the following links to find a physician. Find a physician by specialty Find a physician by name Custom search         Using This Directory: Click on the black triangle on the title bar to change the sort order. Click on a blue triangle to expand or collapse that category. Specialty Description Diagnostic Radiology is the branch of Radiology that deals with the utilization of all modalities of radiant energy in medical diagnosis and therapeutic procedures utilizing radiologic guidance. This includes, but is not restricted to, imaging techniques and methodologies utilizing radiation emitted by x-ray tubes, radionuclides, ultrasonographic devices, and radiofrequency electromagnetic radiation emitted by atoms.