In a conventional x-ray structures are superimposed on top of one another, making it difficult to get a clear picture. Computed tomography, or CT scans take a picture of a single cross-section of the body, giving radiologists an unobstructed view of every organ, bone and soft-tissue. CT uses pencil-point x-ray beams from a rotating doughnut surrounding the patient's body. Detectors pick up the signals which vary in strength after they pass through human tissue. The detectors then send this information to a computer, which creates a picture of a single slice of the human body. A picture that looks something like—a pizza.