GE_OEC_9600_C-Arms

16 Image System Calibration
ADJUST CAMERA DECENTRATION
WARNING... Steps within this procedure produce X-rays. Use appropriate precautions.
NOTE: The purpose of this procedure is to center the physical position of the
Beam Alignment Tool in the II's output.
1. Remove the converging line pair tool and install the beam alignment tool on the
Image Intensifier as shown in Figure 14. Note the location of the X & Y adjustment
screws. You will adjust these in the next few steps.
Y
DO NOT ADJUST
THESE SCREWS
X
A
B
C
OEC
DO NOT ADJUST
THESE SCREWS
C-ARM
Figure 14 - Beam Alignment Tool Mounting Orientation
2. Acquire the Monitor/Camera Alignment Pattern. This is done to remove circular
blanking during an exposure so the full Image Intensifier image can be seen.
NOTE: Ignore the electronic Monitor/Camera Alignment Pattern overlay during this
decentration adjustment of the Beam Alignment Tool.
3. Select MAG 2 and take an AUTO FLUORO exposure. Rotate the camera until the
beam alignment pattern tick marks are at a 45° angle as shown in Figure 15.