5-36 Image Optimization
5.10 3D/4D
NOTE:
3D/4D imaging is largely environment-dependent, so the images obtained are
provided for reference only, not for confirming diagnoses.
5.10.1 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.
Terms
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.
