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Sensitivity of Two Electron Beam Tomography Protocols for the Detection and Quantification of Coronary Artery Calcium

Tracy Callister1, Warren Janowitz2 and Paolo Raggi3

1 EBT Research Foundation, 64 Valleybrook Dr., Hendersonville, TN 37075.
2 Miami Cardiac and Vascular Institute, 8900 N. Kendall Dr., Miami, FL 33176.
3 Cardiology Section, SL 48, Tulane University School of Medicine, 14 Tulane Ave., New Orleans, LA 70112.



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  		Fig. 1A. —62-year-old woman with calcified coronary artery plaques. Axial electron beam tomography image obtained with 3-mm collimation protocol shows two distinct calcified areas at level of proximal (arrowhead) and mid (arrow) portions of the left anterior descending coronary artery.

 


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  		Fig. 1B. —62-year-old woman with calcified coronary artery plaques. Axial electron beam tomography image with 6-mm collimation protocol obtained in same patient as in A. With this protocol, the proximal lesion appears much smaller, and the plaque in middle portion of vessel is undetectable. A greater degree of partial volume averaging causes smoothing and softening of image.

 

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