13-32 Probes and Biopsy 
z  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. 
z  To use the Middle Line function of the ultrasound system: 
a)  Use the trackball to change the mark position and by adjusting lithotripsy 
machine tools or patient posture to locate the stone center at the mark. 
b)  Read the depth of the mark by observing the depth caliper on the right of the 
image. 
c)  After the stone is located, refer to lithotripsy machine manuals to perform the 
lithotripsy. 
z  The depth of the mark is displayed in the image parameter area of the screen.