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Thoracic Imaging |
1 From the Department of Radiology, University Center Hospital Calmette, Blvd Jules Leclerc, 59037 Lille Cedex, France (B.G., D.S., I.M., J.R., M.R.J.); the Department of Medical Statistics, University of Lille, France (V.D., A.D.); and the Medical Research Group, Lille, France (I.M., J.R., M.R.J.). From the 2000 RSNA scientific assembly. Received July 31, 2000; revision requested September 9; final revision received December 27; accepted January 11, 2001. Address correspondence to M.R.J. (e-mail: mremy-jardin@chru-lille.fr).
PURPOSE: To analyze the influence of multi–detector row spiral computed tomography (CT) on identification of peripheral pulmonary arteries.
MATERIALS AND METHODS: Peripheral pulmonary arteries were analyzed on optimally opacified contrast material–enhanced spiral CT angiograms in 30 patients devoid of pleuroparenchymal disease who underwent scanning with multi–detector row CT (collimation, 4 x 1 mm; pitch, 1.7–2.0; scanning time, 0.5 second). Two series of scans were systematically generated from each data set, 1.25-mm-thick (group 1) and 3-mm-thick (group 2) sections, leading to the analysis of 600 segmental (20 arteries per patient), 1,200 subsegmental (40 arteries per patient), 2,400 fifth-order (80 arteries per patient), and 4,800 sixth-order (160 arteries per patient) pulmonary arteries in each group.
RESULTS: Multi–detector row CT with reconstructed scans of 1.25-mm-thick sections (group 1) allowed (a) analysis of a significantly higher percentage of subsegmental arteries (94% in group 1 vs 82% in group 2; P < .001) and (b) a significantly higher percentage of fifth- and sixth-order arteries, respectively, identified in 74% and 35% of cases in group 1 and 47% and 16% in group 2 (P < .001). The causes for inadequate depiction of subsegmental branches in group 1 were partial volume effect (43%), anatomic variants (39%), and cardiac (17%) and respiratory (1%) motion artifacts.
CONCLUSION: Multi–detector row CT with reconstructed scans of 1.25-mm-thick sections enables accurate analysis of peripheral pulmonary arteries down to the fifth order on spiral CT angiograms.
Index terms: Computed tomography (CT), angiography, 944.12916 • Computed tomography (CT), technology, 944.12915, 944.12916, 944.12919 • Embolism, pulmonary, 944.77 • Lung, anatomy, 60.12115, 60.92 • Pulmonary arteries, CT, 944.12915, 944.12916, 944.12919
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