CHAP
. 10
GE Healthcare
Senographe 2000 D Acquisition System
REV 1
OM 5179217–1–100
113
4.
AOP MODE
The AOP (Automatic Optimization of Parameters) Mode controls radiation and allows the system to
select the main parameters.
It can be used for standard exposures, magnified exposures, or for the examination of the chest wall.
See section 3 for additional notes on configuration.
Before each exposure made in AOP mode a brief absorption measurement exposure is made to
determine the thickness and density of the breast being examined. This information, together with the
priority set by the operator, allows optimization of exposure parameters. The exposure is then made,
using the track/filter/kV/mAs configuration which supplies the lowest dose with respect for the user’s
imaging priority.
The operator chooses one of three options, according to the priority required:
D
CNT
Contrast Gives priority to subject contrast.
D
DOSE Dose
Gives priority to dose reduction.
D
STD
Standard Selects a compromise between contrast and dose.
BREAST COMPRESSION OF AT LEAST 3 daN (30 NEWTONS OR 6.7 POUNDS) IS
ESSENTIAL WHEN USING THE AOP MODE.
The system automatically selects the following parameters:
D
Anode track (Mo or Rh)
D
Filter (Mo or Rh)
D
kV values
D
mAs values
D
Focal spot
Note:
By default, the system selects the large focal spot when a standard exam is selected, and the
small focal spot when magnification is selected. Exposures are not possible if these settings
are overridden.
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