Ring artifact
Updates to Article Attributes
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 2. They occur close to the isocentre 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: recalibrationRecalibration of the scanner and informwill usually rectify the artifact. Occasionally detector elements need replacing which can be costly. The referring clinician knowshould be notified that the worrying-lookingconcerning ring shadows are artifactual. Occasionally, detector elements need replacement which can be costly.
-<p><strong>Ring artifacts</strong> 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 <sup>2</sup>. They occur close to the isocentre of the scan and are usually visible on multiple slices at the same location. They are a common problem in cranial CT.</p><p>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.</p>- +<p><strong>Ring artifacts</strong> 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 <sup>2</sup>. They occur close to the isocentre of the scan and are usually visible on multiple slices at the same location. They are a common problem in cranial CT.</p><p>Recalibration of the scanner will usually rectify the artifact. Occasionally detector elements need replacing which can be costly. The referring clinician should be notified that the concerning ring shadows are artifactual. </p>
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