AGFA 5420/100, User Manual

Page: 139 / 188

DX-D 400
User Manual
0232F EN
20191213
129
AEC RESET : If the exposure is aborted by the AEC back-up timer, the indicator
on the “ AEC Reset ” push-button blinks accompanied of an audible alarm. Next
exposure is inhibited until the AEC function is reset by pressing the “ AEC Reset ”
push-button. When the Generator is in “Prep” mode, the AEC function can not
be reset.
The “ AEC Reset ” push-button may blink when the kVp value, AEC Density and
Film / Screen Combination select a technique that is out of the operative range
with AEC, it inhibits the next exposure. Change any parameter (kVp value, AEC
Density or Film / Screen Combination) in order to obtain a technique enabled
for AEC.
6.2.1 RAPID TERMINATION
This safety device terminates the X-ray exposure when no radiation is detected
in the Ion Chamber or the selected parameters (short backup time/mAs) are not
appropriate for an exposure with AEC.
AEC Rapid Termination compares the AEC ramp with a 25% of the final value
at the 30% of the Backup Time. It is activated after 30% of the exposure backup
time and after 10 ms of exposure, both conditions have to be fulfilled.
Whenever the AEC is ON it is recommended to select an exposure back-up time
higher than 100 ms for improved operation of Rapid Termination.
The Error Code related to the Rapid Termination is E95.
6.3 ANATOMICAL PROGRAMMER (APR) (OPTIONAL)
Anatomical Programmer (APR) module is comprised of the controls which
select the Patient Size and Display Selectors. The process is shown on the APR
Display.
The APR techniques are factory pre-programmed according to different
standard technique that combines six Body Regions with their Anatomical
Views (Organ + Projection). Besides the radiographic parameters, selections
of the workstation or AEC (density, fields and film / screen combination) can be
assigned to the APR techniques. These selections will be always common for
all the patient sizes of each Anatomical View. These techniques may be
modified and stored anew into non-volatile memory by the operator.
The APR techniques are intended only as a guide line, they are only starting
points that can be replaced by more specific protocols developed by the
operator. Accurate exposure factors are dependent among other things on grid
factors, table top absorption, screen film combinations, film processing or
detector features.