5-26 Image Optimization 
5.10  Smart 3D 
3D 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 cannot be achieved with the standard 2D-mode and to improve the 
understanding of complex structures. 
  Terms 
  3D image Volume Rendering (VR): the image displayed to represent the volume data. 
  View point: a position for viewing volume data/3D image. 
  MultiPlaner Rendering (MPR): the three sectional planes of the volume acquisition. 
As shown in the figure below, the XY-paralleled plane is the C-section, the XZ-
paralleled plane is the B-section, and the YZ-paralleled plane is the A-section. The 
probe is moved along the X-axis. 
  ROI (Region of Interest): a volume box used to determine the height and width of 
scanning volume. 
  VOI (Volume of Interest): a volume box used to display the 3D image (VR) by 
adjusting the region of interest in MPR.   
 
  ROI and VOI 
After the system enters 3D imaging, a B image with ROI displays on the screen. A line 
(shown in the following figure) shows that the upper edge position of the VOI is inside 
the ROI.