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Image Settings Affecting Nuchal Translucency Measurement Using Volume NT Software

Authors
 Hee Young Cho  ;  Young Han Kim  ;  Yong Won Park  ;  Sung Yoon Kim  ;  Kwang Hee Lee  ;  Joon Sang Yoo  ;  Ja-Young Kwon 
Citation
 Yonsei Medical Journal, Vol.56(5) : 1345-1351, 2015 
Journal Title
 Yonsei Medical Journal 
ISSN
 0513-5796 
Issue Date
2015
Abstract
PURPOSE: To evaluate the effects of the deviation from the mid-sagittal plane, fetal image size, tissue harmonic imaging (THI), and speckle reduction filter (SRF) on the measurement of the nuchal translucency (NT) thickness using Volume NT software. MATERIALS AND METHODS: In 79 pregnant women, NT was measured using Volume NT. Firstly, the three-dimensional volumes were categorized based on the angle of deviation in 10° intervals from the mid-sagittal plane. Secondly, the operator downsized the fetal image to less than 50% of the screen (Method A) and by magnifying the image (Method B). Next, the image was magnified until the fetal head and thorax occupied 75% of the screen, and the NT was measured (Method C). Lastly, NT values were acquired with THI and SRF functions on, with each function alternately on, and with both functions off. RESULTS: The mean differences in NT measurements were -0.09 mm (p<0.01) between two-dimensional (2D) and a deviation of 31-40° and -0.10 mm (p<0.01) between 2D and 41-50°. The intraclass correlation coefficients (ICC) for 2D-NT and NT according to image size were 0.858, 0.923, and 0.928 for methods A, B, and C, respectively. The ICC for 2D-NT and NT with respect to the THI and SRF were 0.786, 0.761, 0.740, and 0.731 with both functions on, THI only, SRF only, and with both functions off, respectively. CONCLUSION: NT measurements made using Volume NT are affected by angle deviation from the mid-sagittal plane and fetal image size. Additionally, the highest correlation with 2D-NT was achieved when THI and SRF functions were used.
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/140896
DOI
10.3349/ymj.2015.56.5.1345
Appears in Collections:
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Obstetrics and Gynecology (산부인과학교실)
Yonsei Authors
권자영(Kwon, Ja Young) ; 김영한(Kim, Young Han) ; 박용원(Park, Yong Won) ; 조희영(Cho, Hee Young)
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