ABSTRACT

Background: In contrast to the literature, orbital CT scans at the hospital used a 1.25 mm thick slice, then reconstructed with a slice thickness according to the clinical setting.

Aim: This research aimed to determine the anatomical image of orbital CT scan in slice thickness variations and determine the value of slice thickness, which produced optimal anatomical image information.

Method: It was experimental research. There were 15 patients with orbital CT scans whose slice thickness was made into a 1.25 mm data row. The data row was then reconstructed with slice thickness variations into 1.25 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, and 5 mm. Information clarity about anatomical imagery was assessed, including Nasal Bone, Optic Nerve, Sinus Ethmoidalis, Sinus Sphenoidalis, Lacrimal Bone, Cornea, Lens, Globe, and Sclera. Data analysis with Spearman test and Friedman test showed α = 5%.

Results: There is a difference in information on anatomical images of orbital CT scan in Slice thickness variations with p-value <0.023. 2.5 mm slice thickness results in the most optimal anatomical image information with mean rank = 5.50. Slice thick 3 mm can be used as an alternative to getting the same anatomical image information with a smaller radiation dose.

Keywords: Anatomical Image Information, Slice Thickness, CT ScanOrbita