Normal measurement of orbital structures: Implications for the assessment of Graves' ophthalmopathy

Sheikh, M, Abalkhail, S, Doi, S and Al-Shoumer, K (2007) Normal measurement of orbital structures: Implications for the assessment of Graves' ophthalmopathy. Australasian Radiology, 51 3: 253-256. doi:10.1111/j.1440-1673.2007.01721.x


Author Sheikh, M
Abalkhail, S
Doi, S
Al-Shoumer, K
Title Normal measurement of orbital structures: Implications for the assessment of Graves' ophthalmopathy
Journal name Australasian Radiology   Check publisher's open access policy
ISSN 0004-8461
1440-1673
Publication date 2007-06
Sub-type Article (original research)
DOI 10.1111/j.1440-1673.2007.01721.x
Volume 51
Issue 3
Start page 253
End page 256
Total pages 4
Place of publication Carlton South, Vic.
Publisher Blackwell Science for the Royal Australasian College of Radiologists
Language eng
Abstract Compute tomography anatomy of the orbits is well described, but only a few reports are available on normal measurements of the extraocular muscles (EOM) and globe position (GP). We obtained CT images from patients who were referred to our department for CT of the paranasal sinuses using a standard protocol for evaluation of normal orbital measurements. Our study suggests that optimum results are attained with the use of a coronal scan at a window level and width setting that results in an optimum image at the maximum muscle width for assessment of EOM and an axial scan at the mid-GP for GP and interzygomatic line. Based on our normal values, a right-to-left ratio of more than 1.4 for EOM diameter or 1.2 for GP is indicative of asymmetry. An absolute diameter of EOM > 8 mm and GP < 2 mm are abnormal.
Keyword CT
orbits
Graves' ophthalmopathy
normal measurements
EXTRAOCULAR-MUSCLE ENLARGEMENT
COMPUTERIZED-TOMOGRAPHY
CT
VOLUME
MRI
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Public Health Publications
 
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Created: Wed, 07 Jul 2010, 10:18:34 EST