Coronary calcium causes high X-ray attenuation and is relatively easily detected by CT. Initially, EBCT was used to detect and quantify coronary calcium and recently spiral CT has also been used for calcium quantification. Agatston et al developed a calcium score based on the product of area and maximal CT density value of the calcium deposits.2 The Agatston calcium score is now widely used in studies evaluating the predictive value of calcium in asymptomatic individuals.

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de Feyter, P.J, Weustink, A.C, Meijboom, W.B, Mollet, N.R.A, & Cademartiri, F. (2007). Multislice computed tomography coronary plaque imaging. In Handbook of the Vulnerable Plaque, Second Edition (pp. 327–334). Retrieved from