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American Journal of Roentgenology, Vol 165, 541-546, Copyright © 1995 by American Roentgen Ray Society

ARTICLES

Helical CT of the upper airway: normal and abnormal findings on three- dimensional reconstructed images

PM Silverman, AS Zeiberg, RB Sessions, TR Troost, WJ Davros and RK Zeman
Department of Radiology, Georgetown University Medical Center, Washington, DC 20007, USA.

Imaging of the hypopharynx, larynx, and upper airway are effectively achieved with CT and MR imaging. These techniques have proved their diagnostic usefulness in assessing the deep soft tissues not visible with laryngoscopy [1]. However, with axial imaging, large numbers of images often need to be mentally stacked to envision the appearance of the airway. With helical CT, we can create high-quality three- dimensional (3D) reconstructions [2, 3]. Advantages of helical technology include rapid scanning, decreased motion artifact, and minimization of misregistration artifacts. Recent work has suggested a role for multiplanar and 3D reconstructions of helical data for assessing the tracheobronchial tree [3]. The helically derived 3D models illustrate the normal and abnormal findings affecting the airway.
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