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Multiplanar and 3D Imaging of the Central Airways: Comparison of Image Quality and Radiation Dose of Single– Detector Row CT and Multi– Detector Row CT at Differing Tube Currents in Dogs¹

¹ From the Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave, Boston, MA 02215. Received June 17, 2002; revision requested August 14; final revision received October 29; accepted November 5. Address correspondence to P.M.B. (e-mail: pboisell@caregroup.harvard.edu).

View larger version (157K): [in a new window]   Figure 1a. Comparison of 3D central airway images obtained with single-detector row CT and multi-detector row CT at differing doses. (a) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240 mA single-detector row CT (3-mm section thickness) shows lack of expected smoothness along the contour of the trachea and main bronchi, with severe stair-step artifact (arrow) noted in the main bronchi. (b) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240-mA multi-detector row CT (2.5-mm section thickness) shows smooth contour of trachea but mild ridging artifact (arrow) at level of carina and main bronchi. (c) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 120-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b. (d) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 40-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b and c. (e) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 20-mA multi-detector row CT (2.5-mm section thickness) was given a lower ranking than the 240-mA (b), 120-mA (c), and 40-mA (d) scans.

View larger version (164K): [in a new window]   Figure 1b. Comparison of 3D central airway images obtained with single-detector row CT and multi-detector row CT at differing doses. (a) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240 mA single-detector row CT (3-mm section thickness) shows lack of expected smoothness along the contour of the trachea and main bronchi, with severe stair-step artifact (arrow) noted in the main bronchi. (b) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240-mA multi-detector row CT (2.5-mm section thickness) shows smooth contour of trachea but mild ridging artifact (arrow) at level of carina and main bronchi. (c) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 120-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b. (d) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 40-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b and c. (e) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 20-mA multi-detector row CT (2.5-mm section thickness) was given a lower ranking than the 240-mA (b), 120-mA (c), and 40-mA (d) scans.

View larger version (162K): [in a new window]   Figure 1c. Comparison of 3D central airway images obtained with single-detector row CT and multi-detector row CT at differing doses. (a) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240 mA single-detector row CT (3-mm section thickness) shows lack of expected smoothness along the contour of the trachea and main bronchi, with severe stair-step artifact (arrow) noted in the main bronchi. (b) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240-mA multi-detector row CT (2.5-mm section thickness) shows smooth contour of trachea but mild ridging artifact (arrow) at level of carina and main bronchi. (c) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 120-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b. (d) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 40-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b and c. (e) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 20-mA multi-detector row CT (2.5-mm section thickness) was given a lower ranking than the 240-mA (b), 120-mA (c), and 40-mA (d) scans.

View larger version (162K): [in a new window]   Figure 1d. Comparison of 3D central airway images obtained with single-detector row CT and multi-detector row CT at differing doses. (a) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240 mA single-detector row CT (3-mm section thickness) shows lack of expected smoothness along the contour of the trachea and main bronchi, with severe stair-step artifact (arrow) noted in the main bronchi. (b) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240-mA multi-detector row CT (2.5-mm section thickness) shows smooth contour of trachea but mild ridging artifact (arrow) at level of carina and main bronchi. (c) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 120-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b. (d) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 40-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b and c. (e) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 20-mA multi-detector row CT (2.5-mm section thickness) was given a lower ranking than the 240-mA (b), 120-mA (c), and 40-mA (d) scans.

View larger version (166K): [in a new window]   Figure 1e. Comparison of 3D central airway images obtained with single-detector row CT and multi-detector row CT at differing doses. (a) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240 mA single-detector row CT (3-mm section thickness) shows lack of expected smoothness along the contour of the trachea and main bronchi, with severe stair-step artifact (arrow) noted in the main bronchi. (b) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 240-mA multi-detector row CT (2.5-mm section thickness) shows smooth contour of trachea but mild ridging artifact (arrow) at level of carina and main bronchi. (c) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 120-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b. (d) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 40-mA multi-detector row CT (2.5-mm section thickness) shows image quality similar to that of b and c. (e) A 3D volume-rendering reconstruction of central airways (viewed from anterior perspective) from 20-mA multi-detector row CT (2.5-mm section thickness) was given a lower ranking than the 240-mA (b), 120-mA (c), and 40-mA (d) scans.