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.
- 1. Barrett JF, Keat N. Artifacts in CT: recognition and avoidance. Radiographics. 2004;24 (6): 1679-91. doi:10.1148/rg.246045065 - Pubmed citation
- 2. Kalender WA. Computed Tomography. Publicis. (2011) ISBN:389578317X. Read it at Google Books - Find it at Amazon
- 3. Coronary CT Angiography: Practice Essentials, Overview, Clinical Applications: Coronary Artery Disease [Internet]. 2018 [cited 2018 Apr 2]. Available from: https://emedicine.medscape.com/article/1603072-overview#a9
- 4. Shapiro MD, Pena AJ, Nichols JH, Worrell S, Bamberg F, Dannemann N, et al. Efficacy of pre-scan beta-blockade and impact of heart rate on image quality in patients undergoing coronary multidetector computed tomography angiography. Eur J Radiol. 2008 Apr;66(1):37–41.
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Physics and imaging technology: CT
computed tomography (CT)
- CT technology
- dual energy CT
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- CT image quality
- CT dose
CT contrast medium
iodinated contrast media
- water soluble
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- coronary CT angiography
- patient-based artifacts
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