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CAT scans

Computerised axial tomography (CAT) still uses X-rays to see inside the body. But instead of using a single beam, a CAT scanner takes many X-rays around the body. The scanner's computer then builds up pictures of a 'slice' through the body and combines them to give a 3D image. Scientists used CAT to carry out the first detailed studies of the brain, before even more powerful techniques were developed.

A CAT scanner.
A CAT scanner.
Corbis

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