) CT( اندازه گيري ضخامت طبيعي عضلات اكسترااكولار باتوموگرافي كامپيوتري

Normative measurement of extra ocular muscles by using computed topography (CT)

Thickening of extra ocular muscles are seen in a variety diseases and disorders . Normal values of these muscleʹs diameters are necessary for diagnosis and differentiation of pathologic conditions. Magnetic resonance imaging (MRI) and computed x-ray topography (CT ) are essential studies for visualization of most normal and abnormal orbital structures . This study was performed for determining of the normative measurements of extra ocular muscles diameters and probable age and sex related differences in Iranian population . 100 patients presenting for CT Scan of paranasl sinuses were evaluated and the diameters of their extra orbital muscle were measured and analyzed . Statistically , there was no significant difference between normal mean diameter of extra ocular muscles (right internal rectos, left external rectos, right superior complex group, left superior complex group, left superior oblique, right inferior oblique and left inferior oblique males and females results , but there were significant differences between age groups and right and left orbits about all measured parameters . Our study results can help ophthalmologists to accurately assess enlargement of the extra ocular muscles and the optic nerve .