5-32 Image Optimization
NOTE: 1. A region with qualified image in B mode may not be optimal for 3D/4D
imaging.
E.g. adequate AF isolation for one sectional 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/4D
imaging.
3. Even with good fetal condition, to acquire an approving 3D/4D image may
need more than one scanning.
5.10.2 Overview
Ultrasound data based on three-dimensional imaging methods can be used to image any
structure where a view can’t be achieved by standard 2D-mode to improve understanding
of complex structures.
4D provides continuous, high volume acquisition of 3D images. 4D adds the dimension of
“movement” to a 3D image by providing continuous, real-time displays.
Mode definition
z Smart 3D
The operator manually moves the probe to change its position/angle when
performing the scanning. After the scanning, the system carries out image
rendering automatically, and then displays a frame of 3D image.
z Static 3D
Posit the probe at a fixed place; the probe automatically performs the scanning.
After the scanning is completed, the system carries out image rendering, and
then displays a frame of 3D image.
z 4D
The probe performs the scanning automatically. During the scanning, the system
renders 3D images in real time, and all 3D images are displayed in real time.
Ter m s
z VR: a three-dimensional content.
z Volume data: the image data set of a 3D object rendered from 2D image
sequence.
z 3D image: the image displayed to represent the volume data.
z View point: a position for viewing volume data/3D image.
z Section image: tangent planes of the 3D image obtained by algorithm. As shown
in the figure below, XY-paralleled plane is C-section, XZ-paralleled plane is B-
section, and YZ-paralleled plane is A-section. The probe is moved along the X-
axis.
z ROI (Region of Interest): a volume box used to determine the height and width of
scanning volume.
z VOI (Volume of Interest): a volume box used to determine the area of a sectional
plane for 3D imaging.
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