5-46 Image Optimization 
  Slice position (to the central slice): displayed in the top-left corner of each image, 
indicating the position of each image (such as -7 mm, -3 mm, 3 mm, 8 mm). 
  Coordinate axis: indicated on the three A, B, C reference images. Correspond to the 
central slice line, and will move accordingly with the central slice line. 
  Slice shifting 
Roll the trackball to shift the crossing point of the central axis up/down and left/right. The 
slice lines will shift accordingly with the crossing point. 
Click [Slice] on the screen to fine-tune slice lines horizontally. 
  Slice position 
Click [Slice position] to move the active slice line (green) either forward or backward 
within the range. The corresponding slice will be highlighted in green. 
  Spacing 
The value is displayed on the top-left side of the slice. Unit: mm. Adjust the [Spacing]. The 
adjusting range is from 0.5 mm to 10 mm. 
  Slice numbers 
Change slice numbers as necessary via [Slice Number] on the screen. 
  Image rotation 
Press <Scale>, <Baseline> and <PW> to perform axial rotation or use [Slice] item to 
adjust the nearest VOI section (cut plane) position.   
For details, see the descriptions in Static 3D. 
  Image zooming 
Same as Static 3D image zooming. 
  Hide/show reference image 
Show or hide the reference image. 
  Quick switch to single display 
Select a particular slice, double-press <Set> to see the slice in full screen, then double-
press<Set> again to return to the original display format. 
  Reset Ori. 
Click [Reset Ori.] to reset the orientation and zoom status of the image. 
  Comments & Body Marks 
The operations are the same as those in the other modes.   
  Measurement 
Measurement can be done on any slice when it is in the single format display. Same 
operations as what you can do in 3D image viewing mode.   
5.13.8  Smart Face 
Smart Face is only used for obtaining fetal face features, not for confirming a 
diagnosis. 
This feature allows the system to recognize fetal face automatically and then display the face 
in a recommended viewing angle. 
4D module should be installed first. 
Smart Face is an option. 
Basic Procedures 
1.  Acquire Static 3D image or frozen 4D single-frame image of fetal face.