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Image Quality from High-Resolution CT of the Lung: Comparison of Axial Scans and of Sections Reconstructed from Volumetric Data Acquired Using MDCT

Department of Radiology, University Hospital Basel, Petersgraben 4, Basel, Switzerland.

View larger version (174K): [in a new window]   Fig. 1A —68-year-old man with severe emphysema. Images are displayed at window level of -500 H and width of 1,400 H. Image obtained with axial high-resolution CT (1 mm) reveals relevant motion artifacts such as doubling of left major fissure (arrow) and double images of pulmonary vessels and bronchi (arrowheads).

View larger version (151K): [in a new window]   Fig. 1B —68-year-old man with severe emphysema. Images are displayed at window level of -500 H and width of 1,400 H. Reconstructed (2-mm) high-resolution image from volumetric MDCT at corresponding level shows no motion artifacts. Detailed evaluation of image for presence of bronchiectasis and bronchial wall thickening (arrowheads), septal lines (plain arrow), and vessels (tailed arrow) is possible. Extension of emphysema is seen (asterisks).

View larger version (14K): [in a new window]   Fig. 2 —Histograms show distribution of scores for 10 categories by reviewer and method. HRCT = high-resolution CT.

View larger version (157K): [in a new window]   Fig. 3A —34-year-old man with recurrent large cell lymphoma (asterisk) in right middle lobe after stem cell transplantation. Images are displayed at window level of -500 H and width of 1,400 H. Image obtained with axial high-resolution CT clearly depicts, in right lower lobe, ground-glass attenuation (arrows) that represents viral infection in this patient undergoing immunosuppressive treatment.

View larger version (150K): [in a new window]   Fig. 3B —34-year-old man with recurrent large cell lymphoma (asterisk) in right middle lobe after stem cell transplantation. Images are displayed at window level of -500 H and width of 1,400 H. Corresponding image obtained from volumetric MDCT shows slight blurring of ground-glass attenuation (arrows). Minor cardiac motion artifacts with doubling of pulmonary vessel adjacent to heart (arrowhead) were not considered to compromise image evaluation.

View larger version (169K): [in a new window]   Fig. 4A —69-year-old man with sarcoidosis. Images are displayed at window level of -500 H and width of 1,400 H. Image obtained with axial high-resolution CT shows decreased regional attenuation due to mosaic perfusion (open arrows) and irregular septal thickening (solid arrows). Diffuse small nodules are visible (arrowheads).

View larger version (165K): [in a new window]   Fig. 4B —69-year-old man with sarcoidosis. Images are displayed at window level of -500 H and width of 1,400 H. Reconstructed image from MDCT reveals no significant difference in image quality. Focal areas of decreased attenuation (open arrows), septal thickening (solid arrow), and diffuse nodules (arrowheads) are clearly depicted.

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