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Zipper ArtifactInfoSheet: - Artifacts - Case Studies, Reduction Index, etc.MRI Resource Directory: - Artifacts -
 
Quick Overview
Artifact Information
NAME
Zipper, star
DESCRIPTION
Bands through image center
REASON
Hardware or software problems
HELP
Larger FOV, oversampling
Zipper artifacts appear as dashed lines. There are various causes for this MRI artifact.
Most of zipper artifacts result from inhomogeneities of the magnetic field caused by interferences with radio frequency from various sources ('your radio is working in the scanner room means your shielding is not working'). Software and equipment problems can also cause zipper lines in both directions.
mri safety guidance
Image Guidance
Scanning room door during the acquisition of images is closed, shielding is working, and all disturbing devices are removed?

See also Room Shielding, Active Shielding, Radio Frequency Shielding.
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Central Point ArtifactInfoSheet: - Artifacts - Case Studies, Reduction Index, etc.MRI Resource Directory: - Artifacts -
 
Quick Overview
Please note that there are different common names for this artifact.
Artifact Information
NAME
Central point, DC artifact, DC offset
DESCRIPTION
Bright spot
REASON
DC voltage offset
HELP
Call the service
This artifact appears as a bright spot (or zipper line) in the image center. Central point artifacts are caused by a DC offset in the hardware. MRI scanners normally offer a software compensation (DC correction, baseline correction) for prevention.
mri safety guidance
Image Guidance
Take care for a constant temperature. If the problem increases or keeps on existing, it should be addressed to the service.
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Further Reading:
  Basics:
Central Point Artifact
   by www.mritutor.org    
  News & More:
MRI Artifact Gallery
   by chickscope.beckman.uiuc.edu    
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