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.


Representative images of nuchal translucency (NT) thickness measurements using Volume NT™ at three different magnifications: (A and B) automated NT measurement with the fetal head and thorax occupying less than 50% of the image (method A); (C and D) automated mid-sagittal reconstruction in low magnification then zoomed-in to magnify the fetus so as to occupy the whole screen (method B); (E and F) automated NT measurement with fetal head and thorax occupying the whole screen (method C).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Representative images of nuchal translucency (NT) thickness measurements using Volume NT™ at three different magnifications: (A and B) automated NT measurement with the fetal head and thorax occupying less than 50% of the image (method A); (C and D) automated mid-sagittal reconstruction in low magnification then zoomed-in to magnify the fetus so as to occupy the whole screen (method B); (E and F) automated NT measurement with fetal head and thorax occupying the whole screen (method C).

Mentions: The following magnification conditions were used to evaluate the effects of magnification on the NT measured automatically using Volume NT™ (Fig. 1):


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)

Representative images of nuchal translucency (NT) thickness measurements using Volume NT™ at three different magnifications: (A and B) automated NT measurement with the fetal head and thorax occupying less than 50% of the image (method A); (C and D) automated mid-sagittal reconstruction in low magnification then zoomed-in to magnify the fetus so as to occupy the whole screen (method B); (E and F) automated NT measurement with fetal head and thorax occupying the whole screen (method C).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Representative images of nuchal translucency (NT) thickness measurements using Volume NT™ at three different magnifications: (A and B) automated NT measurement with the fetal head and thorax occupying less than 50% of the image (method A); (C and D) automated mid-sagittal reconstruction in low magnification then zoomed-in to magnify the fetus so as to occupy the whole screen (method B); (E and F) automated NT measurement with fetal head and thorax occupying the whole screen (method C).
Mentions: The following magnification conditions were used to evaluate the effects of magnification on the NT measured automatically using Volume NT™ (Fig. 1):

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.