GE_OEC_9600_C-Arms

Image System Calibration 5
4. Attach the Wisconsin mesh resolution tool to the Image Intensifier grid at a 45§
angle to the Image Intensifier Grid line pairs as shown in Figure 2.
NOTE: Be sure to orient the mesh tool with the 35/24 line pairs to the "top" of the
II. This is important for verifying the operation of camera rotation. If using
an alternate resolution tool, use a specific portion of it as the 35/24 "top" of
the mesh tool.
TOP VIEW OF
IMAGE INTENSIFIER
Figure 2 - Mesh Tool Installation
5. Boot the system and position the Mobile C-Arm so that the effects of the earth’s
magnetic field are minimized. This can be accomplished by taking AUTO FLUORO
images of the mesh tool while simultaneously rotating the Mobile C-Arm in a 360°
circle. While imaging, note any changes to linearity and positioning of the mesh tool
image.
NOTE: Do not change the 45° angle of the "C" itself during this test. Move only
the entire C-Arm. This will eliminate mechanical flexing of the "C" which
could cause a shift in the image giving a false impression of magnetic
interference.
A. If no changes are noticed, this is not a concern and you may align the beam and
camera in any location in the room.
B. If changes are noticed, position the Mobile C-Arm in the position where mesh
tool distortion and/or image shift is minimal.
6. Turn the Workstation keyswitch to the OFF position.