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Case 17.30 

Case 17.30
Chapter:
Case 17.30
Author(s):

Christine U. Lee

, and James F. Glockner

DOI:
10.1093/med/9780199915705.003.0448
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date: 23 October 2019

19-year-old woman with inflammatory bowel disease and suspected perianal fistula

Axial postgadolinium 2D SPGR image (Figure 17.30.1) demonstrates a prominent artifact extending across the right side of the pelvis along the phase encoding direction.

Zipper artifact

Zipper artifacts most often occur as a result of a frequency leak—this is just extraneous RF radiation detected by the receiver coil. Notice that the line of artifact is off-center, indicating that the fundamental frequency is different from the Larmor frequency of the MRI system, which is what you would expect from an extraneous source....

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