Special Imaging Modes
11-2
a
b c
c) Amniotic fluid(AF) isolation
The region desired is isolated by amniotic fluid adequately
The region to imaging is not covered by limbs or umbilical cord.
d) The fetus keeps still. If there is a fetal movement, you need a rescan when the fetus is
still.
îš„ Angle of a B tangent plane
The optimum tangent plane to the fetal face 3D imaging is the sagittal section of the
face. To ensure high image quality, you’d better scan maximum face area and keep
edge continuity.
îš„ Image quality in B mode (2D image quality)
Before entering 3D capture, optimize the B mode image to assure:
z High contrast between the desired region and the AF surrounded.
z Clear boundary of the desired region.
z Low noise of the AF area.
îš„ Scanning technique
z Stability: Body, arm and wrist must move smoothly, otherwise the restructured 3D
image distorts.
z Slowness: Move or rotate the transducer slowly. The speed of linear scan is about
2 cm/s and the rotation rate of the fan scan is about 10°/s～15°/s.
z Evenness: Move or rotate the transducer at a steady speed or rate.
CAUTION:
1. A region with qualified image in B mode may not be optimal
for 3D imaging. E.g. adequate AF isolation for one section
plane doesn’t mean the whole desired region is isolated by
AF.
2. More practices are needed for a high success rate of
qualified 3D imaging.
3. Even with good fetal condition, to acquire an approving 3D
image may need more than one scanning.
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