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High-Resolution CT Using MDCT: Comparison of Degree of Motion Artifact Between Volumetric and Axial Methods

D. M. Kelly1, I. Hasegawa1, R. Borders2, H. Hatabu1 and P. M. Boiselle1

1 Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Ave., Boston, MA 02215.
2 The University of Arizona College of Medicine, Tucson, AZ.



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  		Fig. 1A. —48-year-old man with limited systemic sclerosis who underwent CT to evaluate for interstitial lung disease. Supine volumetric high-resolution CT image of lower lung zone at level of inferior pulmonary veins shows motion artifact manifested by doubling of right major fissure (white arrow) and blurring of pulmonary vasculature. Also note dependent opacity at base of right lung (black arrow).

 


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  		Fig. 1B. —48-year-old man with limited systemic sclerosis who underwent CT to evaluate for interstitial lung disease. Prone axial high-resolution CT image of lower lung zone at slightly higher level than A shows improved image quality with less motion artifact compared with A. Note increased image sharpness and clarity by comparing appearance of right major fissure (arrow) and vascular margins on both images. Also note resolution of dependent opacity in right lung, which is diagnostic of transient dependent atelectasis and excludes early interstitial lung disease as a cause of this finding. This image was inverted to allow direct comparison with supine axial image.

 

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