Diagnostic radiology involves one or more medical imaging technologies to diagnose and sometimes treat disease. A diagnostic radiologist is a physician who works with X-rays, ultrasound, MRI (Magnetic Resonance Imaging), CT scans (Computed Tomography), and other imaging technology to diagnose and sometimes treat diseases or disorders, such as breast cancer, tumors, lung disorders or heart disease.

Doctor density varies by specialty and location. The United States has 26,395 practicing diagnostic radiologists. Broken out by state, diagnostic radiology doctor density in Alabama is 354, in Alaska is 58, in Arizona is 539, in Arkansas is 194, in California is 2,814, in Colorado is 342, in Connecticut is 409, in Delaware is 123, in District of Columbia is 174, in Florida is 1,345, in Georgia is 677, in Hawaii is 123, in Idaho is 172, in Illinois is 1,008, in Indiana is 555, in Iowa is 282, in Kansas is 267, in Kentucky is 404, in Louisiana is 334, in Maine is 110, in Maryland is 624, in Massachusetts is 1,002, in Michigan is 1,059, in Minnesota is 582, in Mississippi is 152, in Missouri is 638, in Montana is 66, in Nebraska is 186, in Nevada is 160, in New Hampshire is 124, in New Jersey is 748, in New Mexico is 150, in New York is 2,017, in North Carolina is 734, in North Dakota is 57, in Ohio is 1,084, in Oklahoma is 271, in Oregon is 334, in Pennsylvania is 1,392, in Rhode Island is 139, in South Carolina is 301, in South Dakota is 64, in Tennessee is 599, in Texas is 1,741, in Utah is 171, in Vermont is 54, in Virginia is 666, in Washington is 670, in West Virginia is 139, in Wisconsin is 572, and in Wyoming is 44.