GE Brivo OEC 715 - Limiting Resolution

Brivo OEC 715/785/865 Mobile C-Arm X-Ray Product Service Manual
4-50
7. If failed after many trials, check the kVp and mA calibration, and come back to Camera Iris
Adjustment. Repeat as many times as necessary.
8. When passed, check if the kVp is within specification of
ABS Tracking Check. If fails, perform
kVp and mA check, and return back to the Camera Iris adjustment.
9. When passed, fix the iris by tighten the Camera Iris Securing Screw, and remove the dosimeter
probe from the I.I., and remove copper from the X-ray tube, and perform ABS Tracking check.
Cleanup
When you follow the normal beam alignment procedure, at this stage, you do not need to
reassemble the Camera Head Cover. You may still need to access the camera head for Camera focus
adjustment.
4.6.8. Limiting Resolution
Limiting Resolution Setup
1. Position the C-arm with I.I. above the X-ray tube.
2. Create a new exam to make default settings.
3. Place a Spatial Resolution tool on the Image
Intensifier, and secure it with transparent tape.The
angle between the horizontal axis of the image and
the Spatial Resolution tool shall be around 45
degrees, and the layout of Spatial Resolution tool
should be as follow.
4. Select Auto Fluoroscopy mode. Take an exposure,
and stop when image is stable. Adjust kVp and mA if
necessary.
5. Read the limiting resolution on the display image. It is
the maximum number (lp/mm) where half of the
lines are distinguishable. Adjusting brightness and contrast to get high image quality.
6. Verify if the resolution is within the specified value range below.
Field Size
NORM MAG1 MAG2
OEC 715,
OEC 785
OEC 865
OEC 715,
OEC 785
OEC 865
OEC 715,
OEC 785
OEC 865
Resolution
(Lp/mm)
≥ 2.0 ≥ 2.2 ≥ 2.6 ≥ 3.0 ≥ 3.1 ≥ 3.5
7. Repeat step 2 to step 6 for MAG1 mode.
8. Repeat step 2 to step 6 for MAG2 mode.
9. If the resolution check fails, adjust the Camera Focus.
Brivo OEC 715/785/865