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.
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.
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Physics and imaging technology: CT
computed tomography (CT)
- CT technology
- CT image reconstruction
- CT image quality
- CT dose
- CT contrast medium
- coronary CT angiography
- patient-based artifacts
- physics-based artifacts
- hardware-based artifacts
- CT safety
- history of CT