GE Revolution CT User Manual page 174

Number
8
9
10
174
Icon Function
Laser Alignment Light
Internal Landmark
External Landmark
Direction 5480385-1EN, Revision 1
Description
Press to toggle all laser alignment lights on/off and to move the
gantry components from the park or idle position to the align‐
ment lights position. Alignment lights are used to establish land‐
mark locations. Three alignment lights are displayed:
•
Axial, divides anatomy into superior and inferior sections.
• Sagittal, divides the anatomy into right and left sections.
•
Coronal, divides anatomy into anterior and posterior sec‐
tions.
CAUTION
For patient safety, always have patients
close their eyes anytime the laser align‐
ment lights are on.
The sagittal, coronal, and transverse alignment lights are within
±1 mm of the gantry coordinate system (x, y and z-axis) cen‐
tered at gantry iso center.
NOTE: The laser alignment light switch is provided as an
alternative to beam attenuators.
Press to establish the table's reference point when positioning
the patient. This reference point is normally the anatomic refer‐
ence point used when positioning the patient. For example, if
the patient's anatomic reference point is the sternal notch, then
the sternal notch would be centered to the laser alignment light.
•
For Internal Landmark, the gantry displays a table location
of 0 mm. This sets the zero point for which S and I scan
locations are centered around.
• For External Landmark , the gantry displays a table loca‐
tion approximately 240 mm from the internal landmark, de‐
pending on table characterization.
A landmark must be set before you click Confirm settings.
At Done Scanning, the landmark is cleared.
For scan setup details, see the Set up and position the patient
procedure.
Revolution CT User Manual
3 Gantry