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Technical Developments |
1 From the Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass (L.K.H., K.H.Z., P.C., U.J.S.); Siemens Medical Solutions, Division CT, Forchheim, Germany (L.K.H.); Department of Health Care Policy, Harvard Medical School, Boston, Mass (K.H.Z.); and Department of Radiology, Medical University of South Carolina, 169 Ashley Ave, Charleston, SC 29425 (P.C., U.J.S.). From the 2002 RSNA scientific assembly. Received May 27, 2003; revision requested August 7; revision received January 20, 2004; accepted February 17. L.K.H. supported by the Medical Image Processing Laboratory, Muelheim, Germany. U.J.S. supported by a research grant from Berlex Laboratories, Wayne, NJ. Address correspondence to U.J.S. (e-mail: schoepf@musc.edu).
Thirty patients underwent 16-section multi–detector row computed tomographic (CT) angiography of the thorax with retrospective electrocardiographic gating. Institutional review board approval was obtained for retrospective analysis of CT scan data and records; patient informed consent was not required. Images reconstructed at six different time points (0%, 20%, 40%, 50%, 60%, 80%) within the R-R interval on the electrocardiogram were analyzed by two radiologists for diagnostic quality, to identify suitable reconstruction intervals for optimal suppression of cardiac motion. Five regions of interest (left coronary artery, aortic root, ascending and descending aorta, pulmonary arteries) were evaluated. Best image quality was achieved by referencing image reconstruction to middiastole (50%–60%) for the left coronary artery, aortic root, and ascending aorta. The pulmonary arteries are best displayed during mid- to late diastole (80%).
© RSNA, 2004
Index terms: Aorta, CT, 56.12116, 94.12116 • Computed tomography (CT), angiography, 53.12116, 54.12116, 56.12116, 94.12116 • Coronary vessels, CT, 54.12116 • Pulmonary arteries, CT, 564.12116, 944.12116
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