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Effects of High-Resolution CT of the Lung Using Partial Versus Full Reconstruction on Motion Artifacts and Image Noise

¹ All authors: Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-2 dong, Songpa-gu, Seoul, South Korea 138-736.

View larger version (81K): [in a new window]   Fig. 1 —34-year-old man with benign pulmonary nodule. High-resolution CT image of left lung exemplifies measurement of maximum width (arrows) of cardiac motion artifact and area percentage of motion artifacts in left lung. Artifact area (dotted line) in left lung was bordered by outermost points of paracardiac area showing cardiac motion artifacts, and its percentage to whole area of left lung at scanned level was calculated.

View larger version (11K): [in a new window]   Fig. 2 —Visual grading of cardiac motion artifacts in cardiac border, bronchi, vessels, and fissure on 0.3-second (gray bars) and 0.75-second (black bars) high-resolution CT (HRCT) images. Difference in visual grade for each anatomic structure between 0.3-second and 0.75-second HRCT images was significant (p < 0.001). Difference in total visual grade of all evaluated anatomic structures between 0.3-second images (15.4 ± 1.2) and 0.75-second images (7.6 ± 2.5) was significant (p < 0.001).

View larger version (94K): [in a new window]   Fig. 3A —76-year-old man with lung cancer. 0.3-second high-resolution CT image reveals no cardiac motion artifacts in left lung and increased noise because of increased temporal resolution.

View larger version (96K): [in a new window]   Fig. 3B —76-year-old man with lung cancer. 0.75-second high-resolution CT image shows motion artifacts along cardiac border (> 4 mm in maximum width) and doubling (arrows) of larger bronchi, larger vessels, and fissure.

View larger version (7K): [in a new window]   Fig. 4 —Maximum width of cardiac motion artifact along left cardiac border in 0.3-second and 0.75-second high-resolution CT (HRCT) images. Difference between 0.3-second images (0.1 ± 0.5 mm) and 0.75-second images (4.5 ± 1.7 mm) was significant (p < 0.001).

View larger version (7K): [in a new window]   Fig. 5 —Area percentage of motion artifact in left lung in 0.3-second and 0.75-second high-resolution CT (HRCT) images. Difference between 0.3-second images (6.7% ± 18.4%) and 0.75-second images (36.2% ± 20.9%) was significant (p < 0.001).

View larger version (9K): [in a new window]   Fig. 6 —Image noises (standard deviation of CT densitometry) in air and lung in 0.3-second (gray bars) and 0.75-second (black bars) high-resolution CT (HRCT) images. Image noises in air (38.0 ± 9.2) and lung parenchyma (86.0 ± 23.1) for 0.3-second HRCT images were greater than those on 0.75-second images (35.6 ± 9.6 and 76.0 ± 20.3, respectively) (p < 0.01).

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