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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.


Images of effects of tissue harmonic imaging (THI) and speckle reduction filter (SRF): (A) THI and SRF functions on; (B) THI function on; (C) SRF function on; (D) both functions off.
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Figure 2: Images of effects of tissue harmonic imaging (THI) and speckle reduction filter (SRF): (A) THI and SRF functions on; (B) THI function on; (C) SRF function on; (D) both functions off.

Mentions: THI and a SRF were applied in order to evaluate the effect of noise reduction functions when using Volume NT™ (Fig. 2). Values of 2D-NT with THI were acquired after achieving the best image quality by adjusting the depth, gray scale, gain, frame rate, focus, and magnification on conventional ultrasonography. Next, THI and SRF were used when acquiring the 3D volume using Volume NT™. These 3D volumes were acquired with both functions on, with each function on individually, and without either of the two functions. We measured the NT value using Volume NT™ on each of these four original images.


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)

Images of effects of tissue harmonic imaging (THI) and speckle reduction filter (SRF): (A) THI and SRF functions on; (B) THI function on; (C) SRF function on; (D) both functions off.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Images of effects of tissue harmonic imaging (THI) and speckle reduction filter (SRF): (A) THI and SRF functions on; (B) THI function on; (C) SRF function on; (D) both functions off.
Mentions: THI and a SRF were applied in order to evaluate the effect of noise reduction functions when using Volume NT™ (Fig. 2). Values of 2D-NT with THI were acquired after achieving the best image quality by adjusting the depth, gray scale, gain, frame rate, focus, and magnification on conventional ultrasonography. Next, THI and SRF were used when acquiring the 3D volume using Volume NT™. These 3D volumes were acquired with both functions on, with each function on individually, and without either of the two functions. We measured the NT value using Volume NT™ on each of these four original images.

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.