Image Quality Check; Field Size Check; Auto Technique Tracking; Image Resolution - GE Brivo OEC 715 Service Manual

Brivo OEC 715/785/865 Mobile C-Arm X-ray Product Service Manual

8.8. Image Quality check

8.8.1.

Field Size Check

1. Select relative field size, open the collimator to the maximum, and take an exposure.
2. Read the BAFT tick mark on the boundary of the image. The size of the image should be within the
range of the values below:
Displayed Image Diameter (mm)
3. If the requirement is not met, you must perform I.I. Field Size Calibration in 4.6.5.
8.8.2.

Auto Technique Tracking

1. Select Auto Fluoro mode and the NORM field size via control panel.
2. Open the collimator Iris and leaves completely.
3. Place copper filters on the collimator and take exposure. Verify that the kVp tracks within the range
indicated in table below.
Model
Brivo OEC 715/785
(I.I PN: 5075001):
Brivo OEC 715/785/865
(I.I PN: 5085917):
Brivo OEC 865
(I.I PN: 5075008):
4. Remove all copper filters.
5. If the kVp is not in the range, refer to 4.6.7 for calibration.
8.8.3.

Image Resolution

Use the converging line pairs/millimeter (Lp/mm) tool on the Image Intensifier. Verify the resolution in
Lp/mm is equal to, or greater than the following values:
Field Size
Resolution Brivo OEC
(Lp/mm) 715/785
≥ 2.0
Record test results on PM checklist.
If the resolution check fails, refer to section 4.6.8 for Camera Focus calibration.
8-16
Mag Mode
Copper Filter Thickness
kVp range
kVp range
kVp range
NORMAL
Brivo OEC
865
≥ 2.2
NORM
210 ±10
1mm
64±4kVp
62±4kVp
62±4kVp
MAG1
Brivo OEC Brivo OEC
715/785 865
≥ 2.6 ≥ 3.0
MAG1 MAG2
155 ±8 115 ±8
2mm
74±4kVp 82±4kVp
72±4kVp 80±4kVp
72±4kVp 80±4kVp
MAG2
Brivo OEC
715/785
≥ 3.1
3mm
Brivo OEC
865
≥ 3.5