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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제56권 제5호
발행연도
2015.1
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1,345 - 1,351 (7page)

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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 NTTM software. Materials and Methods: In 79 pregnant women, NT was measured using Volume NTTM. 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 magnifieduntil the fetal head and thorax occupied 75% of the screen, and the NT was measured (Method C). Lastly, NT values were acquiredwith 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 NTTM 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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