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Serial Electron Beam CT Measurements of Coronary Artery Calcium: Has Your Patient's Calcium Score Actually Changed?

Alexander B. Sevrukov1,2, J. Martin Bland2 and George T. Kondos1

1 Department of Medicine, Section of Cardiology (M/C 715), University of Illinois at Chicago College of Medicine, Chicago, IL 60612.
2 Department of Health Sciences, University of York, Heslington, York YO10 5DD, United Kingdom.



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  		Fig. 1 —Plot shows distribution of differences between repeated measurements of coronary artery calcium (CAC) as function of average CAC score expressed in Agatston CAC score units.

 


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  		Fig. 2 —Plot shows distribution of differences between repeated measurements of coronary artery calcium (CAC) as function of average CAC score expressed in Agatston CAC score units. Curve shows 95% repeatability limits, which include 98% of differences.

 


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  		Fig. 3 —Plot shows distribution of differences between repeated measurements of coronary artery calcium (CAC) as function of average CAC score expressed in volumetric CAC score units (mm3).

 


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  		Fig. 4 —Plot shows distribution of differences between repeated measurements of coronary artery calcium (CAC) as function of average CAC score expressed in volumetric CAC score units (mm3). Curve shows 95% repeatability limits, which include 97.1% of the differences.

 


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  		Fig. 5 —Plot shows distribution of differences between repeated measurements of coronary artery calcium (CAC) as function of average CAC score for very low Agatston CAC scores. The 95% repeatability limits are too wide at these very low scores. No differences are outside the limits until the average CAC score exceeds 5.00 Agatston units. Curve shows 95% repeatability limits.

 

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