6 Automatic exposure modes
86500-IMG rev 3
GE Healthcare
49
6 Automatic exposure modes
Diamond’s
Automatic Exposure Control
(
AEC
) system has three modes of
operation:
•
Auto kV exposure mode
•
Auto Time exposure mode
•
Manual exposure mode
Select the mode with the
Mode
select button. The light at the left of the
button indicates the mode that is currently selected. An automatic
exposure monitor will terminate the exposure in just 50ms if it calculates
that a suitably exposed image cannot be achieved within the back-up
time. Each AEC mode has 15 steps for density adjustment, where one step
corresponds to a 10% decrease or increase (factory default). These steps
may be adjusted by your service technician within a range of 5% to 20%.
Molybdenum or Rhodium filters can be selected either automatically or
manually. Your service technician may activate the automatic filter
selection (AutoFilter) upon request. If the Auto Filter function is inactive,
then the filters are selected manually with a filter selection button. When
Auto Filter mode is selected as 'ON', Diamond chooses the Molybdenum or
Rhodium filter automatically, depending upon the breast thickness. When
AutoFilter is enabled, the user can change the filter, but after the exposure
AutoFilter will again select the used filter. The Aluminum filter is always
selected manually at kV's of 35 and above. The Auto Filter feature is
always disabled when Delta 32 unit is attached to Diamond.
WARNING!
Only authorized personnel may perform AEC programming.
6.1
O
PERATION
IN
A
UTO
K
V
MODE
In
Auto kV
-mode, Diamond determines the initial kV, based on the
compression thickness. The user may change the initial kV and density
settings before the exposure. During the exposure Diamond calculates
appropriate kV, mAs/exposure time for the exposure.
Select the
Auto kV
mode with the
Mode
-key. A LED light indicates the
selected option. Change the selected filter if necessary.
Fig 6.1.
The mode display in Auto-kV mode
FOR
TRAINING
PURPOSES
ONLY!
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