3D ultrasound
（重定向自4D Ultrasound）
![A 3D ultrasound of a human fetus aged 20 weeks](/Images/godic/202412/13/3dultrasound_20_weeks5912.jpg")
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3D ultrasound is a medical ultrasound technique, often used in obstetric ultrasonography (during pregnancy), providing three-dimensional images of the fetus. Three-dimensional ultrasound, also known as phased array ultrasonics, is used extensively in the non-destructive evaluation of materials for purity and failure assessment.