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Updated: Feb 18, 2026

Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Coronary risk assessment at X-ray dose equivalent ungated chest CT: Results of a multi-reader study
Michael Messerli1, Lukas Hechelhammer2, Sebastian Leschka3
1Division of Radiology and Nuclear Medicine, Cantonal Hospital St. Gallen, Switzerland; Department of Nuclear Medicine, University Hospital Zurich, University Zurich, Switzerland.
Objectives:
To determine the value of ultra-low dose chest CT with tin filtration for ordinal coronary artery calcium (CAC) risk scoring.
Methods:
50 patients were prospectively included and underwent clinical standard dose chest CT (1.8±0.7mSv) and ultra-low dose CT (0.13±0.01mSv). Four radiologists estimated presence and extent of CAC.
Results:
Weighted kappa values for CAC were 0.76-0.97 in standard dose and 0.75-0.95 in ultra-low dose CT (p<0.001). Good to excellent agreement was observed for CAC ordinal risk assessment, with readers reporting identical risk in 81% of cases.
Conclusion:
CAC risk can be qualitatively assessed from X-ray dose equivalent ungated chest CT.
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