Artefakt (fejl)
For alternative betydninger, se Artefakt. (Se også artikler, som begynder med Artefakt)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/CT_tooth_artifact.jpg/220px-CT_tooth_artifact.jpg)
Artefakter anvendes også om systematiske fejl på og i signaler og hardware; CCD-chips, i optik og tilsvarende teknik.
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actifact caused by total absporption of X-Ray in head CT scan
Forfatter/Opretter: Brocken Inaglory, Licens: CC BY-SA 3.0
Crepuscular rays and lens flare. The Sun refracted in lenses.
This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A [at centre] so that the dim Sirius B [tiny dot at lower left] could be seen. The cross-shaped diffraction spikes and concentric rings around A*, and the small ring around Sirius B, are artifacts produced within the telescope's imaging system. The two stars revolve around each other every 50 years. Sirius A, only 8.6 light-years from Earth, is the fifth closest star system known. The image was taken with Hubble's Wide Field Planetary Camera 2.