IS Case 207: Ring artifact
Imaging Sciences URMC 2008
Publication Date: 2009-05-22
Third generation CT scanners are known as "rotate/rotate" because the X-ray tube and detector array are linked and rotate together as a unit. Thus, if a detector malfunctions, a circular tracing will appear on the reconstructed image and is called ring artifact. This artifact will usually be seen on at least several contiguous slices, which can help distinguish it from a real finding. Nevertheless, these artifactual rings or bands may sometimes mimic aortic dissection. Fortunately, advances in instrumentation have made ring artifacts quite rare in current practice.
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