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ARDMS - The only means of obtaining the Registered Diagnostic Medical Sonographer ® (RDMS®) credential is by examination. Required examination prerequisites must be fully met before an applicant can earn an ARDMS credential. Applicants are required to pass two comprehensive examinations to earn the RDMS credential listed below. Source: ARDMS.org

3D ultrasound is a medical ultrasound technique, often used in obstetric ultrasonography (duringpregnancy), providing three dimensional images of the fetus.

There are several different scanning modes in medical and obstetric ultrasound. The standard common obstetric diagnostic mode is 2D scanning.[1] In 3D fetal scanning, however, instead of the sound wavesbeing sent straight down and reflected back, they are sent at different angles. The returning echoes are processed by a sophisticated computer program resulting in a reconstructed three dimensional volume image of the fetus's surface or internal organs, in much the same way as a CT scan machine constructs a CT scan image from multiple x-rays. 3D ultrasounds allow one to see the width, height and depth of images in much the same way as 3D movies but no movement is shown[dubious – discuss].

3D ultrasound was first developed by Olaf von Ramm and Stephen Smith at Duke University in 1987.[2]   Source: Wikipedia

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