LG 14HK701G-W.AUB Owner's Manual page 87

Problem
When some areas appear abnormal in the
acquired [Validation] image
50
• When acquiring images in the [Validation] after creating the [Calibration] result file in the Calibration menu, an abnormal image may be acquired. Check the issues
below and follow the guide.
1
When some areas appear in black or light bleeding occurs in the acquired image
- Go to the [Calibration] menu > [BPM Analysis] on the left bottom corner and check if [Rows] and [Columns], [Class 5] ~ [Class 8] have more than dozens of values. If so,
follow the steps below to run a new [Calibration] and acquire [Validation] images.
1) Adjust the X-ray generator's position so that the detector is within the X-ray irradiation range before running a [Calibration].
2) Keep the distance at least 120 cm (47.2 inch) between the detector and the X-ray generator tube.
3) If the distance cannot be more than 120 cm (47.2 inch) in Step 2), change the detector settings as follows before proceeding with the [Calibration].
Go to > [Calibration SW] and enter a value 0.05-0.1 higher than the existing value for [Gain] and [Save].
Go to > [Calibration SW] and enter a value 1.5-2 times greater than the existing value for [Offset] and [Save].
NOTE
• Due to the heel effect of the X-ray generator, if the distance is short, less X-ray irradiation may be applied to the edge of the detector. This difference makes it necessary
to adjust the [Gain] and [Offset] values. The [Gain] adjustment is a required process, but the [Offset] adjustment may be skipped depending on the situation.
4) Go to the [Calibration] menu and acquire Dark Image and Bright Image to run a [Calibration]. If the [BPM Analysis] result is not improved, repeat Step 3).
2
When some areas appear in black in the form of the straight or curved line
- Check if the problematic area is within the X-Ray irradiation range.
- Check if foreign matters or other objects are on the detector.
3
When white or black pixels appear in the image
- Run a [Calibration] again to create a new Calibration result, and, with the result, acquire [Validation] images.
- It the problem persists even after the new Calibration, set the pixel as a bad pixel in the [User BPM] and go to [History] > [Open] on the top right corner to load the
newly created calibration result and perform a [Validation] again.
Solution