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The International Journal of Cardiovascular Imaging

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01-01-2015 | Original Paper

Automatic detection and quantification of the Agatston coronary artery calcium score on contrast computed tomography angiography

Authors: Wehab Ahmed, Michiel A. de Graaf, Alexander Broersen, Pieter H. Kitslaar, Elco Oost, Jouke Dijkstra, Jeroen J. Bax, Johan H. C. Reiber, Arthur J. Scholte

Published in: The International Journal of Cardiovascular Imaging | Issue 1/2015

Abstract

Potentially, Agatston coronary artery calcium (CAC) score could be calculated on contrast computed tomography coronary angiography (CTA). This will make a separate non-contrast CT scan superfluous. This study aims to assess the performance of a novel fully automatic algorithm to detect and quantify the Agatston CAC score in contrast CTA images. From a clinical registry, 20 patients were randomly selected for each CAC category (i.e. 0, 1–99, 100–399, 400–999, ≥1,000). The Agatston CAC score on non-contrast CT was calculated manually, while the novel algorithm was used to automatically detect and quantify Agatston CAC score in contrast CTA images. The resulting Agatston CAC scores were validated against the non-contrast images. A total of 100 patients (60 ± 11 years, 63 men) were included. The median CAC score on non-contrast CT was 145 (IQR 5–760), whereas the contrast CTA CAC score was 170 (IQR 23–594) (P = 0.004). The automatically computed CAC score showed a high correlation (R = 0.949; P < 0.001) and intra-class correlation (R = 0.863; P < 0.001) with non-contrast CT CAC score. Moreover, agreement within CAC categories was good (κ 0.588). Fully automatic detection of Agatston CAC score on contrast CTA is feasible and showed high correlation with non-contrast CT CAC score. This could imply a radiation dose reduction and time saving by omitting the non-contrast scan.

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Title: Automatic detection and quantification of the Agatston coronary artery calcium score on contrast computed tomography angiography
Authors: Wehab Ahmed
Michiel A. de Graaf
Alexander Broersen
Pieter H. Kitslaar
Elco Oost
Jouke Dijkstra
Jeroen J. Bax
Johan H. C. Reiber
Arthur J. Scholte
Publication date: 01-01-2015
Publisher: Springer Netherlands
Published in: The International Journal of Cardiovascular Imaging / Issue 1/2015
Print ISSN: 1569-5794
Electronic ISSN: 1875-8312
DOI: https://doi.org/10.1007/s10554-014-0519-4

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