Computerised Tomography

Computerised Tomography (or CT scanning) is a kind of very smart X-ray, in which the normal "blackness" or "whiteness" of an X-ray is separately measured for millions of pixels in 3 dimensions by computerised calculation of the values of a "slice" of tissue which are put together again to conjure up a fine-grain digital image of that cut of tissues being examined

CT scanning broke the ground many years ago for the development of modern highly intricate images of previously hidden areas of the body (like the brain), adjustable after completion of the investigation for density and contrast