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Image Settings Affecting Nuchal Translucency Measurement Using Volume NT Software

 Hee Young Cho  ;  Young Han Kim  ;  Yong Won Park  ;  Sung Yoon Kim  ;  Kwang Hee Lee  ;  Joon Sang Yoo  ;  Ja-Young Kwon 
 YONSEI MEDICAL JOURNAL, Vol.56(5) : 1345-1351, 2015 
Journal Title
Issue Date
Adult ; Embryo, Mammalian/diagnostic imaging* ; Female ; Humans ; Image Enhancement/methods* ; Imaging, Three-Dimensional/methods* ; Nuchal Translucency Measurement*/methods ; Pregnancy ; Sensitivity and Specificity ; Software
Volume NT™ software ; angle deviation ; image size ; nuchal translucency ; speckle reduction filter ; tissue harmonic imaging
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.
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1. College of Medicine (의과대학) > Dept. of Obstetrics and Gynecology (산부인과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Ja Young(권자영) ORCID logo https://orcid.org/0000-0003-3009-6325
Kim, Young Han(김영한) ORCID logo https://orcid.org/0000-0003-0645-6028
Park, Yong Won(박용원)
Cho, Hee Young(조희영)
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