J Korean Ophthalmol Soc.  2016 Nov;57(11):1671-1677. 10.3341/jkos.2016.57.11.1671.

Measurement of Orbital Volume from Different Slice Thickness Facial Computed Tomography Scans Using a Semi-automatic Program

Affiliations
  • 1Department of Ophthalmology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea. pbloadsky@naver.com
  • 2Department of Ophthalmology, Myongji Hospital, Seonam University College of Medicine, Goyang, Korea.
  • 3Department of Ophthalmology, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, Korea.
  • 4Department of Bioengineering, Kyung Hee University School of Medicine, Seoul, Korea.

Abstract

PURPOSE
To compare the orbital volume calculated from various slice thickness facial computed tomography scans using a semi-automated computer program.
METHODS
Axial and coronal scans of 2, 2.5, 3 mm slice thickness facial computed tomography scans were used to measure the orbital volume. The cross-sectional area was determined from each slice using a semi-automated computer program (MATLAB 2009a®, MathWorks, Inc., Natick, MA, USA), and then the volume was calculated from serial reconstruction of the cross sections.
RESULTS
The measured value in the 2 mm images was 33.14 ± 2.37 cm³ in the right orbit and 34.32 ± 2.60 cm³ in the left orbit for the axial scans, and 35.54 ± 3.58 cm³ in the right orbit and 34.96 ± 4.05 cm³ in the left orbit for the coronal scans. In the 2.5 mm images, the values were 33.28 ± 3.35 cm³ in the right orbit and 33.73 ± 4.10 cm³ in the left orbit for the axial scans, and 35.24 ± 3.98 cm³ in the right orbit and 35.10 ± 3.93 cm³ in the left orbit for the coronal scans. In the 3 mm images, the values were 33.23 ± 2.70 cm³ in the right orbit and 33.39 ± 2.69 cm³ in the left orbit for the axial scans, and 33.20 ± 3.64 cm³ in the right orbit and 32.95 ± 3.45 cm³ in the left orbit for the coronal scans. In the 3 mm image, there was not a significant difference in the calculated volume between the axial and coronal scans (p(3mm) = 0.62).
CONCLUSIONS
Because there is no difference in the results of the orbital volumetric measurements between three other slice thicknesses in the axial scan, using axial scan images with a computer program that semi-automatically calculates orbital volume is useful. In addition, the volume measured by thick slice images has more reproducibility than the volume measured by thin slice images.

Keyword

Computed tomography (CT) slice thickness; Facial CT; Orbital volume; Volume measurement
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