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Evaluation of Subsecond Gated Helical CT for Quantification of Coronary Artery Calcium and Comparison with Electron Beam CT

J. Jeffrey Carr1,2, John R. Crouse, III2,3, David C. Goff, Jr.2,3, Ralph B. D'Agostino, Jr.3, Neil P. Peterson4 and Gregory L. Burke2,3

1 Department of Radiology, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC 27157-1088.
2 Department of Public Health Science, Wake Forest University School of Medicine, Winston-Salem, NC 27157-1088.
3 Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157-1088.
4 Department of Radiology, Mission Saint Joseph Hospitals 509 Biltmore Ave., Asheville, NC 28801.



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  		Fig. 1A. —Coronary artery calcifications in 72-year-old man. Electron beam CT (A) and helical CT (B) scans show calcifications in left anterior descending artery and diagonal branches.

 


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  		Fig. 1B. —Coronary artery calcifications in 72-year-old man. Electron beam CT (A) and helical CT (B) scans show calcifications in left anterior descending artery and diagonal branches.

 


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  		Fig. 1C. —Coronary artery calcifications in 72-year-old man. Electron beam CT (C) and helical CT (D) scans show additional calcification in proximal right coronary artery.

 


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  		Fig. 1D. —Coronary artery calcifications in 72-year-old man. Electron beam CT (C) and helical CT (D) scans show additional calcification in proximal right coronary artery.

 


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  		Fig. 2. —Graph shows measurement of calcium standards on electron beam CT (solid line) and helical CT (dotted line). Mean CT attenuation is shown for each of four standard calcium concentrations in calibration phantom (0, 50, 100, and 200 mg/ml). Imaging of standard regions of interest was performed at level of left main coronary artery in study participants.

 


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  		Fig. 3. —Scatterplot shows total calcium scores obtained with helical CT and electron beam CT. Total calcium scores were obtained using modified Agatston scoring system and CT threshold of 130 H for both CT techniques.

 

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