RT Journal Article SR Electronic T1 CT Radiation Dose for Computer-Assisted Endoscopic Sinus Surgery: Dose Survey and Determination of Dose-Reduction Limits JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A1378 A1 Nauer, C.B. A1 Eichenberger, A. A1 Dubach, P. A1 Gralla, J. A1 Caversaccio, M. YR 2008 UL http://www.ajnr.org/content/early/2008/11/20/ajnr.A1378.abstract AB