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Contour ArtifactInfoSheet: - Artifacts - Case Studies, Reduction Index, etc.MRI Resource Directory: - Artifacts -
 
See Black Boundary Artifact.
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Black Boundary 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
Black boundary, dark boundary, contour, chemical shift, relief
DESCRIPTION
Black contours at boundaries
REASON
Chemical shift, opposed phase image, motion shear (flow effects), inversion recovery null point
HELP
Smaller water fat shift (high bandwidth), in phase image, SE sequences
Black boundary artifacts are black lines following voxels where both water and fat protons are present in the same voxel. This artifact arise along the boundary of organs or tissues perpendicular to the frequency encoding direction, and occurs preferentially in gradient echo sequences with out of phase echo times.
mri safety guidance
Image Guidance
Fat suppression techniques eliminate this artifact. For artifact reducing helps a smaller water fat shift (high bandwidth), a higher matrix or/and an in phase TE.

See also Chemical Shift Artifact.
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Further Reading:
  Basics:
What is chemical shift artefact? Why does it occur? How many Hz at 1.5 T?
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