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KMID : 0358420150580040268
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Korean Journal of Obstetrics and Gynecology
2015 Volume.58 No. 4 p.268 ~ p.276
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Feasibility of three-dimensional reconstruction and automated measurement of fetal long bones using 5D Long Bone
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Hur Hye-won
Kim Young-Han
Cho Hee-Young
Park Yong-Won
Won Hye-Sung
Lee Mi-Young
Yun Bo-Hyon
Lee Kwang-Hee
Kim Sung-Yoon
Yoo Jun-Sang
Kwon Ja-Young
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Abstract
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Objective: To evaluate the feasibility of five-dimensional Long Bone (5D LB), a new technique that automatically archives, reconstructs images, and measures lengths of fetal long bones, to assess whether the direction of volume sweep influences fetal long bone measurements in three-dimensional (3D) ultrasound and 5D LB, and to compare measurements of fetal long bone lengths obtained with 5D LB and those obtained with conventional two-dimensional (2D) and manual 3D techniques.
Methods: This prospective study included 39 singleton pregnancies at 26+0 to 32+0 weeks of gestation. Multiple pregnancies, fetuses with multiple congenital anomalies, and mothers with underlying medical diseases were excluded. Fetal long bones of the lower extremities-the femur, tibia, and fibula were measured by 2D and 3D ultrasound, and 5D LB, by an expert and non-expert examiner. First, we analyzed the 3D ultrasound and 5D LB data according to 2 different sweeping angles. We analyzed intra- and inter-observer variability and agreement between ultrasound techniques. Paired t-test, interclass correlation coefficient, and Bland-Altman plot and Passing-Bablok regression were used for statistical analysis.
Results: There was no statistical difference between long bone measurements analyzed according to 2 different volume-sweeping angles by 3D ultrasound and 5D LB. Intra- and inter-observer variability were not significantly different among all 3 ultrasound techniques. Comparing 2D ultrasound and 5D LB, the interclass correlation coefficient for femur, tibia, and fibula was 0.91, 0.92, and 0.89, respectively.
Conclusion: 5D LB is reproducible and comparable with conventional 2D and 3D ultrasound techniques for fetal long bone measurement.
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KEYWORD
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5D Long Bone , Fetal biometry , Fetal long bone , Three-dimensional ultrasound , Two-dimensional ultrasound
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