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MRI Artifacts
  
Ultrasound Imaging Artifacts Open this link in a new window
Gibbs Artifact 
Quick Overview
Please note that there are different common names for this MRI artifact.

Artifact Information
NAME Gibbs, Gibbs ringing, truncation
DESCRIPTION Edge ringing, syrinx-like stripe
REASON Sharp changes in intensity (incomplete digitization of the echo)
HELP More samples

The Gibbs or ringing artifact appears as a series of lines in the MR image parallel to abrupt and intense changes in the object at this location. This artifact does not occur visibly on smooth objects. This artifact is caused by the Gibbs phenomenon, an overshoot or ringing of Fourier series occurring at discontinuities.
In the spinal cord, a small syrinx can be simulated by the Gibbs phenomenon. Gibbs artifacts are also seen in other regions, for example the brain//skull interface.
Fine lines visible in an image may be due to undersampling of the high spatial frequencies, respectively incomplete digitization of the echo.
With more encoding steps the Gibbs artifacts is less intense and narrower. Therefore, e.g. the artifact is more intense in the 256 point dimension of a 256x512 acquisition matrix.


Image Guidance
This problem can only be resolved by smoothing filters (LanczosSigmaFactor, 2-D Exponential Filtering, Gegenbauer Reconstruction etc.) or with a higher acquisition matrix and/or a smaller FOV, to smooth the object.
See also Gibbs Phenomenon and Apodization.

• View the DATABASE results for 'Gibbs Artifact' (4).Open this link in a new window

 
Further Reading:
  Basics:
Artifacts in MRI
Saturday, 1 October 2011   by www.huc.min-saude.pt    
Lanczos sigma Factor
   by mathworld.wolfram.com    
  News & More:
Troubleshooting the ACR MRI Accreditation Phantom Tests
   by www.aapm.org    
Similar Artifacts:
 • Truncation Artifact
 • Sample Imperfection (Artifact)
  Aliasing Artifact top
 
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