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Qu'est-ce (qui) est CAT scan - définition
 and diameter (D).svg?width=200 "Bronchial wall thickness (T) and diameter of the bronchus (D)")
![Types of presentations of CT scans: <br />- Average intensity projection<br />- [[Maximum intensity projection]]<br />- Thin slice ([[median plane]])<br />- [[Volume rendering]] by high and low threshold for [[radiodensity]]](https://commons.wikimedia.org/wiki/Special:FilePath/CT presentation as thin slice, projection and volume rendering.jpg?width=200 "Types of presentations of CT scans: <br />- Average intensity projection<br />- [[Maximum intensity projection]]<br />- Thin slice ([[median plane]])<br />- [[Volume rendering]] by high and low threshold for [[radiodensity]]")
![[[Commons: Scrollable computed tomography images of a normal brain]]}}](https://commons.wikimedia.org/wiki/Special:FilePath/Computed tomography of human brain - large.png?width=200 "[[Commons: Scrollable computed tomography images of a normal brain]]}}")
![sagittal]] (lower left), and [[coronal plane]]s (lower right)](https://commons.wikimedia.org/wiki/Special:FilePath/Ct-workstation-neck.jpg?width=200 "sagittal]] (lower left), and [[coronal plane]]s (lower right)")
 and patient in a CT imaging system.gif?width=200 "Drawing of CT fan beam and patient in a CT imaging system")
.jpg?width=200 "120x120px")
![pulmonary arteries]] (bright white triangle)](https://commons.wikimedia.org/wiki/Special:FilePath/SADDLE PE.JPG?width=200 "pulmonary arteries]] (bright white triangle)")
Wikipédia
A computed tomography scan (usually abbreviated to CT scan; formerly called computed axial tomography scan or CAT scan) is a medical imaging technique used to obtain detailed internal images of the body. The personnel that perform CT scans are called radiographers or radiology technologists.
CT scanners use a rotating X-ray tube and a row of detectors placed in a gantry to measure X-ray attenuations by different tissues inside the body. The multiple X-ray measurements taken from different angles are then processed on a computer using tomographic reconstruction algorithms to produce tomographic (cross-sectional) images (virtual "slices") of a body. CT scan can be used in patients with metallic implants or pacemakers, for whom magnetic resonance imaging (MRI) is contraindicated.
Since its development in the 1970s, CT scanning has proven to be a versatile imaging technique. While CT is most prominently used in medical diagnosis, it can also be used to form images of non-living objects. The 1979 Nobel Prize in Physiology or Medicine was awarded jointly to South African-American physicist Allan MacLeod Cormack and British electrical engineer Godfrey Hounsfield "for the development of computer-assisted tomography".
