Probes and Biopsy  13-59 
 
To enter the mode: tap [Middle Line] in the biopsy tab or preset a shortcut key for middle line function.   
  The middle line is a vertical dotted line located in the middle of the screen, the position and 
direction of which cannot be changed. 
  There is a mark icon of “×” located on the middle line which can be moved up and down along 
the line by rolling the track ball. 
  To use the Middle Line function of the ultrasound system: 
  The depth of the mark is displayed in the image parameter area of the screen.