J Korean Ophthalmol Soc > Volume 57(11); 2016 > Article
Journal of the Korean Ophthalmological Society 2016;57(11):1671-1677.
DOI: https://doi.org/10.3341/jkos.2016.57.11.1671    Published online November 15, 2016.
Measurement of Orbital Volume from Different Slice Thickness Facial Computed Tomography Scans Using a Semi-automatic Program.
Hye Jee Kim, Ji Sang Han, In Ki Park, Sam Jin Choi, Jae Ho Shin
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.
다양한 단면 두께의 얼굴 전산화단층촬영 사진을 이용하여 측정한 안와용적 비교
김혜지1⋅한지상2⋅박인기3⋅최삼진4⋅신재호1
경희대학교 의과대학 강동경희대학교병원 안과학교실1, 서남대학교 의과대학 명지병원 안과학교실2, 경희대학교 의과대학 경희대학교병원 안과학교실3, 경희대학교 의과대학 의공학교실4
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.
Key Words: Computed tomography (CT) slice thickness;Facial CT;Orbital volume;Volume measurement


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