Antoine Hutt1, Nunzia Tacelli1, Jean-Baptiste Faivre1, Thomas Flohr2, Alain Duhamel3, Jacques Remy1, Martine Remy-Jardin4. 1. Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Lille, France. 2. Computed Tomography; Siemens Healthcare, Forchheim, Germany. 3. Department of Biostatistics (EA 2694), CHRU et Université de Lille, Lille, France. 4. Department of Thoracic Imaging, Hospital Calmette (EA 2694), CHRU et Université de Lille, Lille, France. martine.remy@chru-lille.fr.
Abstract
PURPOSE: To evaluate the influence of temporal resolution (TR) on cardiogenic artefacts at the level of bronchial walls. MATERIAL AND METHODS: Ninety patients underwent a dual-source, single-energy chest CT examination enabling reconstruction of images with a TR of 75 ms (i.e., optimized TR) (Group 1) and 140 ms (i.e., standard TR) (Group 2). Cardiogenic artefacts were analyzed at the level of eight target bronchi, i.e., right (R) and left (L) B1, B5, B7, and B10 (total number of bronchi examined: n = 720). RESULTS: Cardiogenic artefacts were significantly less frequent and less severe in Group 1 than in Group 2 (p < 0.0001) with the highest scores of discordant ratings for bronchi in close contact with cardiac cavities: RB5 (61/90; 68%); LB5 (66/90; 73%); LB7 (63/90; 70%). In Group 1, 78% (560/720) of bronchi showed no cardiac motion artefacts, whereas 22% of bronchi (160/720) showed artefacts rated as mild (152/160; 95%), moderate (7/160; 4%), and severe (1/160; 1%). In Group 2, 70% of bronchi (503/720) showed artefacts rated as mild (410/503; 82%), moderate (82/503; 16%), and severe (11/503; 2%). CONCLUSION: At 75 ms, most bronchi can be depicted without cardiogenic artefacts. KEY POINTS: • Quantitative CT helps analyze morphologic changes in COPD patients • Cardiogenic artefacts may hamper precise analysis of bronchial dimensions • Temporal resolution of CT acquisitions is an important parameter for bronchial imaging.
PURPOSE: To evaluate the influence of temporal resolution (TR) on cardiogenic artefacts at the level of bronchial walls. MATERIAL AND METHODS: Ninety patients underwent a dual-source, single-energy chest CT examination enabling reconstruction of images with a TR of 75 ms (i.e., optimized TR) (Group 1) and 140 ms (i.e., standard TR) (Group 2). Cardiogenic artefacts were analyzed at the level of eight target bronchi, i.e., right (R) and left (L) B1, B5, B7, and B10 (total number of bronchi examined: n = 720). RESULTS:Cardiogenic artefacts were significantly less frequent and less severe in Group 1 than in Group 2 (p < 0.0001) with the highest scores of discordant ratings for bronchi in close contact with cardiac cavities: RB5 (61/90; 68%); LB5 (66/90; 73%); LB7 (63/90; 70%). In Group 1, 78% (560/720) of bronchi showed no cardiac motion artefacts, whereas 22% of bronchi (160/720) showed artefacts rated as mild (152/160; 95%), moderate (7/160; 4%), and severe (1/160; 1%). In Group 2, 70% of bronchi (503/720) showed artefacts rated as mild (410/503; 82%), moderate (82/503; 16%), and severe (11/503; 2%). CONCLUSION: At 75 ms, most bronchi can be depicted without cardiogenic artefacts. KEY POINTS: • Quantitative CT helps analyze morphologic changes in COPDpatients • Cardiogenic artefacts may hamper precise analysis of bronchial dimensions • Temporal resolution of CT acquisitions is an important parameter for bronchial imaging.
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