Ringartefakte

Ring artifacts are a CT phenomenon that occurs due to miscalibration or failure of one or more detector elements in a CT scanner. Less often, it can be caused by insufficient radiation dose or contrast material contamination of the detector cover . They occur close to the isocenter of the scan and are usually visible on multiple slices at the same location. They are a common problem in cranial CT.

The remedy is usually simple: recalibration of the scanner and inform the referring clinician know that the worrying-looking ring shadows are artifactual. Occasionally, detector elements need replacement which can be costly.

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