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(3) Amniotic fluid (AF) isolation
The desired region is adequately isolated by amniotic fluid.
The region to be imaged is not obscured by limbs or umbilical cord.
(4) The fetus keeps still. If there is fetal movement, it is necessary to rescan.
Angle of a B tangent plane
The optimum tangent plane to the fetal face 3D/4D imaging is the sagittal section of
the face. To ensure high image quality, scan the maximum face area and maintain
edge continuity.
Image quality in B mode (2D image quality)
Before entering 3D/4D capture, optimize the B mode image to ensure:
High contrast between the desired region and the surrounding AF.
Clear boundary of the desired region.
Low noise of the AF area.
Scanning technique (only for Smart 3D)
Stability: the body, arm and wrist must move smoothly, otherwise the
restructured 3D image distorts.
Slowness: move or rotate the probe slowly.
Evenness: move or rotate the probe at a steady speed or rate.
1. A region with a qualified image in B mode may not be optimal for 3D/4D
NOTE:
imaging. E.g., adequate AF isolation for one MPR does not mean the whole
desired region is isolated by AF.
2. Practice is needed for a high success rate of qualified 3D/4D imaging.
3. Even with good fetal condition, acquiring a suitable 3D/4D image may
require more than one scanning.
b
a
c
Image Optimization 5-41
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