Moiré fringes
Last revised by Candace Makeda Moore
on 2 Jan 2025
Citation, DOI, disclosures and article data
Citation:
Ballinger J, Ismail M, Bell D, et al. Moiré fringes. Reference article, Radiopaedia.org (Accessed on 25 Mar 2025) https://doi.org/10.53347/rID-22003
rID:
22003
Article created:
3 Mar 2013,
J. Ray Ballinger
Disclosures:
At the time the article was created J. Ray Ballinger had no recorded disclosures.
View J. Ray Ballinger's current disclosures
Last revised:
2 Jan 2025,
Candace Makeda Moore
Disclosures:
At the time the article was last revised Candace Makeda Moore had no financial relationships to ineligible companies to disclose.
View Candace Makeda Moore's current disclosures
Revisions:
15 times, by
8 contributors -
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Synonyms:
- Moire fringes
Moiré fringes are an interference pattern most commonly seen when acquiring gradient echo images using the body coil.
Because of the lack of perfect homogeneity of the main magnetic field from one side of the body to the other, aliasing of one side of the body to the other results in the superimposition of signals of different phases that alternatively add and cancel 1,2, this causes the banding appearance similar to the effect of looking through two screen windows or through the railings of bridge from distance.
Shimming will help to reduce this artifact by making the magnetic field more homogeneous 4.
The term Moiré when used in digital imaging and computer graphics describes an artefact that can be created by overlaying two semi-transparent grids or repeating line patterns on each other, which creates an interference pattern. In general radiography, the term has been used to describe the 'grid moiré pattern' where there is under sampling due to incorrect grid placement or alignment 3.
References
- 1. Stadler A, Schima W, Ba-Ssalamah A, Kettenbach J, Eisenhuber E. Artifacts in Body MR Imaging: Their Appearance and How to Eliminate Them. Eur Radiol. 2006;17(5):1242-55. doi:10.1007/s00330-006-0470-4 - Pubmed
- 2. Ho C, Xiao L, Kwok K et al. Common Artifacts in Magnetic Resonance Imaging: A Pictorial Essay. Hong Kong Journal of Radiology. 2023;26(1):58-65. doi:10.12809/hkjr2317476
- 3. Lin C, Lee W, Chen S et al. A Study of Grid Artifacts Formation and Elimination in Computed Radiographic Images. J Digit Imaging. 2006;19(4):351-61. doi:10.1007/s10278-006-0630-8 - Pubmed
- 4. Wachowicz, K. (2014). Evaluation of active and passive shimming in magnetic resonance imaging. Research and Reports in Nuclear Medicine, 1.
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