Special Imaging Modes
11-8
11.1.2 Note before Use
11.1.2.1 3D/4D Image Quality Conditions
The quality of images reconstructed in the 3D/4D mode is closely related to the fetal
condition, angle of a B tangent plane and scanning technique (only for Smart3D). The
following description uses the fetal face imaging as an example, the other parts imaging
are as the same.
îš„ Fetal Condition
a) Gestational age
Fetuses of 24~30 weeks old are the most appropriate for 3D imaging.
b) Fetal Body Posture
Recommended: Cephalic face up (figure a) or face aside (figure b);
NOT recommended: Cephalic face down (figure c).
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/4D 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/4D 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(only for Smart3D)
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.
To Next Page
Loading...
Need help?
General
