Image analysis was performed by IntelliSpace Portal 7.0 workstation (Philips Healthcare, Chicago, IL). Images were reconstructed in 0.625 slice thickness and displayed as 2000 × 350 HU (level × width) and s-3 filter. Authors and otolaryngologist (blind regarding dose) were evaluated in coronal and axial images independently. Anatomical structures of the optical nerve (cranial nerve II) next to the sphenoid sinus, the anterior branch of the ethmoidal artery, lamina papyracea, and cribriform plate were evaluated. The image qualities were graded as, 1: unacceptable image quality, 2: many artifacts (poor image quality), 3: rare artifacts (moderate image quality), 4: good image quality, and 5: excellent image quality.[2 (link)]
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Image Quality Evaluation Protocol
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Corresponding Organization : Affiliated Hospital of Liaoning University of Traditional Chinese Medicine
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Variable analysis
independent variables
- Slice thickness (0.625)
- Image display settings (2000 × 350 HU (level × width) and s-3 filter)
- Image quality grades (1: unacceptable, 2: many artifacts, 3: rare artifacts, 4: good, 5: excellent)
- Anatomical structures evaluated (optical nerve, anterior branch of the ethmoidal artery, lamina papyracea, cribriform plate)
- Image analysis by authors and otolaryngologist (blind regarding dose)
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