The use of x-rays in medicine was a huge breakthrough at the turn of the century. The problem with x-rays, though, is that they're two-dimensional. Organs of the same density look the same.

Computed tomography (CT) scanning provides images of sections of the body (slices) using special X ray equipment and sophisticated computers. CT scans of internal organs, bone, soft tissue and blood ...

Cancer diagnosis frequently requires imaging studies that in many cases use small amounts of radiation. Procedures such as X-rays; computed tomography (CT); magnetic resonance imaging (MRI); positron ...