Adjusting The Photo Timer - Canon CXDI-50C Service Manual

5.6 Adjusting the photo timer

<Outline>
The photo timer installed in the imaging unit is adjusted so that the exposure time of the X-rays
generated by the X-ray generators is to OFF using the optimal value.
* This work necessitates performing some adjustments inside the X-ray generators. In order to
ensure that the work will proceed smoothly, discuss the schedule and other details with the
representative of the manufacturer of the X-ray generators.
<Preparations>
(1) Start up the CXDI system. (Normal radiography mode)
(2) Perform calibration.
(3) Change parameters of VPT button as follows.
* This operation must be done by the "VPT" button which uses "fixed ROI". The adjustment
cannot be performed properly by the body parts buttons which use auto ROI.
1) From SYSTEM > EDIT EXPOSURE MODE, select VPT button.
2) Press the NEXT PAGE button to enter the parameter editing screen and then set the following
parameters.
(A) GENERATOR PARAMETER SCREEN
Set only the center of the fixed ROI area to ON.
(During the adjustment, the acrylic sheet may be used to cover the fixed ROI area selected
here.)
(B) IP PARAMETER SCREEN
CURVE SHAPE: CHEST
BRIGHTNESS: 6
CONTRAST: 10
Turn on this area only
[GENERATOR PARAMETER SCREEN]
3) Press the OK button to save the parameters you changed.
2. Installation Manual
[IP PARAMETER SCREEN]
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CHEST
BRIGHTNESS: 6
CONTRAST: 10