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2D/3D/4D Ultrasound differences |
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 The regular two dimensional scan (2D) is in black and white and is
used to look inside organs, for example we can see the fetus inside the
maternal uterus, as well as see the internal organs of the fetus - It
produces a slice through the body.
The three/four dimensional
scan (3D/4D) is in colour (sepia) and is called a surface rendering
type of scan. This is when only the outer layer of the image is shown.
We use this for our bonding scan or to look for any soft tissue anomaly
e.g. cleft lip. The movement of the fetus is known as the 4th dimension
(4D) and movement is seen in real time.
Doppler scan is a
technique that uses ultrasound to assess blood flow within the
cardiovascular system. This can be achieved either by using colour flow
where the blood flow is represented schematically with red and blue
colours on screen or pulsed wave doppler which produces characteristic
patterns of flow on screen. This is usually accompanied by the sound of
flowing blood. Blood flow in the umbilical cord and congenital heart
defects can be detected with doppler scans. The equipment used is
similar to the 2D scans. Doppler is an integral feature of virtually
all modern 2D scanners.
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