CT stair-step artifact

Dr Craig Hacking and Dr David Cuete et al.

The CT stair-step artifact is found in straight structures which are oriented obliquely with respect to movement of the table and appear around the edges of sagittal and coronal reformatted images when wide collimations and non-overlapping reconstruction intervals are used.

It is also seen in coronary CT angiography when step-wise reconstructions are from different cardiac phases. This is associated with heart rate variability and irregular heart rates. 

Solution

This can be minimized by, using smaller collimation and overlapping reconstruction in helical imaging.

In coronary CT angiography, 256 and 320-detector CT scanners typically avoid this artifact. Some authors recommend beta-blockers to reduce stair-step artifact, others report limited results in achieving target heart rates with their use.

Share article

Article information

rID: 27658
Section: Physics
Synonyms or Alternate Spellings:
  • CT stair-step artefact

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    3D reconstruction...
    Case 1 - on CTA
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

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

    Alert accept Thank you for updating your details.