Slice-overlap artifact

The slice-overlap artifact, also known as cross-talk artifact, is a type of MRI artifact, namely, the loss of signal seen in an image from a multi-angle, multi-slice acquisition, as is obtained commonly in the lumbar spine. It should not be confused with cross excitation which although similar in causation, is not due to angled images. 

If the slices obtained at different disk spaces are not parallel, they may overlap. If two levels are acquired at the same time, e.g. L4-L5 and L5-S1, the level acquired second will include spins that have already been saturated. This causes a horizontal band of signal loss crossing the image, usually most pronounced posteriorly. The dark horizontal band at the bottom of the following axial image through the lumbar spine demonstrates this artifact.

As long as the saturated area stays posterior to the spinal canal, it causes no meaningful degradation to the image.

Imaging technology

Article information

rID: 22008
Synonyms or Alternate Spellings:
  • Slice overlap artefact
  • Cross talk artefact
  • Cross talk artifact
  • Cross-talk artifact
  • Cross-talk artefact
  • Slice-overlap artefact
  • Slice overlap artifact

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: cross-talk diagram
    Drag here to reorder.
  • Case 1: scout view
    Drag here to reorder.
  • Case 1: L4/5
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.