CT images

Computed tomography (CT) or computerized axial tomography (CAT) is a medical imaging technique for creating cross-sectional (tomographic) images by exposing a subject to X-rays. Two-dimensional X-ray attenuation images taken from different angles are computationally combined to generate the three-dimensional image, eliminating the superimposition of body structures present in the traditional X-ray images.

Voxel values in a CT image represent the relative radiodensity inside that particular volume of tissue, usually in Hounsfield units (HU).

Using CT images in Turku PET Centre

What are CT images used for?


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X-ray tube

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Created at: 2015-06-11
Updated at: 2018-08-13
Written by: Vesa Oikonen