Limits...
Image Settings Affecting Nuchal Translucency Measurement Using Volume NT Software.

Cho HY, Kim YH, Park YW, Kim SY, Lee KH, Yoo JS, Kwon JY - Yonsei Med. J. (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Institute of Women's Life Medical Science, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.

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.

No MeSH data available.


Bland-Altman plots of the variability of nuchal translucency (NT) thickness measurements. (A) Using two-dimensional (2D) ultrasound and method A of Volume NT™, (B) 2D ultrasound and method B, and (C) 2D ultrasound and method C. Dotted lines represent mean±2 SD. US, ultrasonography.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4541665&req=5

Figure 3: Bland-Altman plots of the variability of nuchal translucency (NT) thickness measurements. (A) Using two-dimensional (2D) ultrasound and method A of Volume NT™, (B) 2D ultrasound and method B, and (C) 2D ultrasound and method C. Dotted lines represent mean±2 SD. US, ultrasonography.

Mentions: The mean differences in the NT measurements between 2D and 3D imaging were -0.09 mm (-0.14, -0.03; p<0.01) at a deviation of 31-40° and -0.10 mm (-0.17, -0.03; p<0.01) at a deviation of 41-50°. Therefore, the NT value at a deviation angle greater than 31° was statistically different from the 2D-NT measurement (Table 2). Table 3 shows the mean 2D and Volume NT™ measurements with respect to magnification. Measurements obtained using methods B and C showed greater correlation with the 2D-NT measurement than method A, and the Bland-Altman plots confirmed these results (Fig. 3).


Image Settings Affecting Nuchal Translucency Measurement Using Volume NT Software.

Cho HY, Kim YH, Park YW, Kim SY, Lee KH, Yoo JS, Kwon JY - Yonsei Med. J. (2015)

Bland-Altman plots of the variability of nuchal translucency (NT) thickness measurements. (A) Using two-dimensional (2D) ultrasound and method A of Volume NT™, (B) 2D ultrasound and method B, and (C) 2D ultrasound and method C. Dotted lines represent mean±2 SD. US, ultrasonography.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541665&req=5

Figure 3: Bland-Altman plots of the variability of nuchal translucency (NT) thickness measurements. (A) Using two-dimensional (2D) ultrasound and method A of Volume NT™, (B) 2D ultrasound and method B, and (C) 2D ultrasound and method C. Dotted lines represent mean±2 SD. US, ultrasonography.
Mentions: The mean differences in the NT measurements between 2D and 3D imaging were -0.09 mm (-0.14, -0.03; p<0.01) at a deviation of 31-40° and -0.10 mm (-0.17, -0.03; p<0.01) at a deviation of 41-50°. Therefore, the NT value at a deviation angle greater than 31° was statistically different from the 2D-NT measurement (Table 2). Table 3 shows the mean 2D and Volume NT™ measurements with respect to magnification. Measurements obtained using methods B and C showed greater correlation with the 2D-NT measurement than method A, and the Bland-Altman plots confirmed these results (Fig. 3).

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Institute of Women's Life Medical Science, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.

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.

No MeSH data available.