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CPI Canada Inc
ABS FUNCTIONAL CHECK
The following procedure may be used to verify that the ABS circuits are functioning on
generators equipped with ABS (automatic brightness stabilization).
1.
Switch the generator ON, and select an appropriate fluoroscopic image receptor.
2.
Select ABS mode. The indicator LED adjacent to the ABS selector button on the control
console or on the remote fluoro control will be lit to indicate that ABS is ON.
3.
Open the collimator or beam limiting device shutters to maximum. With no object in the
image field, press the fluoro footswitch. Confirm that the collimator or beam limiting
device is fully open by observing the monitor.
4.
While continuing to press the fluoro footswitch, note the fluoro kV display at the control
console or remote fluoro control. This should be less than 55 kV.
5.
Close the collimator or beam limiting device and press the fluoro footswitch. With no
object in the image field, ensure that the radiation is fully blocked by observing the
monitor. If necessary, cover the image intensifier with lead aprons to block all radiation.
6.
While continuing to press the fluoro footswitch, note the fluoro kV display at the control
console or remote fluoro control. This should be the maximum available fluoro kV, 110 kV
or 125 kV (depending on whether the upper fluoro kV limit has been set to 110 kV or 125
kV).
Place an absorber (20 cm of water, or 1.5 " (3.8 cm) of pure aluminum, or equivalent) in
7.
the center of the image field.
8.
Press the fluoro footswitch. While viewing the absorber on the monitor, open the
collimator or beam limiting device sufficiently to cover as much of the absorber as
possible. Ensure that the X-ray beam does not extend beyond the sides of the absorber
as stray radiation will adversely affect the kVp reading in the next step.
9.
While continuing to press the fluoro footswitch, note the fluoro kV display at the control
console or remote fluoro control. This should stabilize between 70 and 80 kVp.
Millenia / Indico 100 Series Operator Manual
#740811-00
Rev. H
Maintenance Schedule
Page 51
8
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