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Coronary Artery Calcification: Effect of Size of Field of View on Multi–Detector Row CT Measurements¹

¹ From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, Campus Box 8131, 510 S Kingshighway Blvd, St Louis, MO 63110. Received September 10, 2003; revision requested November 20; revision received December 18; accepted January 30, 2004. Address correspondence to K.T.B. (e-mail: baet@mir.wustl.edu).

View larger version (91K): [in a new window]   Figure 1a. Transverse multi-detector row CT images for coronary artery calcium screening reconstructed with (a) 210-mm, (b) 260-mm, and (c) 310-mm FOV in 54-year-old man show the same level of the heart and calcified lesions (arrowheads) in the coronary arteries. Although the 210-mm FOV appears to include too much of the lung region and could have been reduced to cover only the heart at this level, the heart occupies a larger cross-sectional area of the CT images at more inferior levels. The use of smaller FOVs may not completely cover the heart at inferior levels.

View larger version (88K): [in a new window]   Figure 1b. Transverse multi-detector row CT images for coronary artery calcium screening reconstructed with (a) 210-mm, (b) 260-mm, and (c) 310-mm FOV in 54-year-old man show the same level of the heart and calcified lesions (arrowheads) in the coronary arteries. Although the 210-mm FOV appears to include too much of the lung region and could have been reduced to cover only the heart at this level, the heart occupies a larger cross-sectional area of the CT images at more inferior levels. The use of smaller FOVs may not completely cover the heart at inferior levels.

View larger version (100K): [in a new window]   Figure 1c. Transverse multi-detector row CT images for coronary artery calcium screening reconstructed with (a) 210-mm, (b) 260-mm, and (c) 310-mm FOV in 54-year-old man show the same level of the heart and calcified lesions (arrowheads) in the coronary arteries. Although the 210-mm FOV appears to include too much of the lung region and could have been reduced to cover only the heart at this level, the heart occupies a larger cross-sectional area of the CT images at more inferior levels. The use of smaller FOVs may not completely cover the heart at inferior levels.

View larger version (21K): [in a new window]   Figure 2. Graph shows difference in calcium scores of individual subjects between different FOVs (in millimeters). Note that the calcium score at the second FOV is subtracted from the calcium score at the first.