Computerised tomography - or computerised axial tomography (CT ot CAT scan) - is an X-ray imaging technique which allows the assessment of soft tissues as well as bones.
If X-rays are taken from different angles around the body, a computer can analyse the image and construct a three-dimensional representation of it. As there is no way to print a three-dimensional image, the computer can then be instructed to 'slice' this reconstruction into thin two-dimensional 'slices' and present these on X-ray film in sequence, allowing the trained doctor to reconstruct the structures again in his mind in three dimensions.
When CT was first introduced, it seemed like a miracle being able to 'see' soft tissues, but it was soon more-or-less supplanted by MRI scanning.
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