Automatic Brightness Stabilization
Circuit/Mechanical Descriptions
The Auto Brightness Stabilization circuitry adjusts the x-ray exposure parameters and camera gain to optimize the image while
managing exposure rates to the subject. The control signals are applied to the CCD camera and generator kVP and mA.
The AUTO key on the Workstation keyboard turns the function on. The Control Panel Processor PCB sends the command for
Automatic Brightness Stabilization to the Fluoro Functions PCB via the serial port. It is then relayed over the ARCNET to the
Generator software on the X-ray Controller PCB. At this time, the Generator software enables the feature.
Video from the CCD Camera is also input to the Video Controller PCB in the Workstation. The Host Pentium computer looks at a
particular section of the image, called the ABS Sample Window, to calculate the light level of the image. This value is then
relayed to the generator software where the new kVP and mA, plus camera gain changes are calculated based on this light level.
The kVp and mA changes are then set by the generator software. The Camera Gain changes are sent to the Fluoro Functions
PCB via ARCNET.
The camera gain changes are sent to the CCD Camera via the CAM_COMM+
lines. This process continues until the optimum
image brightness is reached.
2
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
To Next Page
Loading...
