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The understanding of the CT artifact is important in diagnosing the various sinus lesions. We investigated several conditions causing thickening of maxillary sinus walls on CT. In unilateral sinusitis by conventional plane films of Waters-view the walls of the affected maxillary sinus showed a tendency (7/13 cases) to be thicker than those of non affected sides, suggesting the thickening is real, at least in part, and caused by inflammation. On the other hand, this tendency of sinus wall thickening in the affected sinuses is greater (12/13 cases) by CT. This indicates that CT artifacts may play a role in wall thickening. Specimens of anterior walls of the maxillary sinuses were obtained by sinusectomies in 14 sides. The actual thickness of the walls evaluated and compared with that of CT images. The thickness by CT was greater in all the 14 sides, confirming the CT artifact. This CT artifact was more influenced in sinuses of sinusitis than in normal sinuses. CT number of soft tissues in the maxillary sinuses showed a tendency to correlate with the apparent thickess of the anterior wall on CT. Phantom studies are in progress to more clarify this CT artifact.

THE INVESTIGATION OF SINUS WALL THICKENING ON CT