GE Healthcare
Senographe DS Acquisition System
Revision 1
Operator Manual 5307907-3-S-1EN
Image Acquisition Procedure
12-imgac.fm
Page no. 127
Chapter 12
4
AOP - Automatic Optimization of Parameters
4-1
Definition of
AOP
AOP (Automatic Optimization of Parameters) automates radiation controls by optimizing the exposure
parameters.
It can be used for contact exposures, magnified exposures, or for the examination of the chest wall. See
section
for additional notes on configuration.
Before each exposure made in AOP mode, a brief absorption measurement exposure is made to deter-
mine the thickness and density of the breast being examined. This information, together with the priority
set by the operator, allows optimization of exposure parameters.
AOP automatically selects the following parameters:
•
Anode track (Mo or Rh)
•
Filter (Mo or Rh)
•
kV value
•
mAs value
The exposure is then made, using the track/filter/kV/mAs configuration which supplies the lowest dose
with respect for the operator’s imaging priority.
4-2
Usage of
AOP
Mode
The operator chooses one of three modes, according to the priority required:
•
CNT Contrast
Gives priority to subject contrast.
•
STD Standard
Selects a compromise between contrast and dose.
•
DOSE Dose
Gives priority to dose reduction.
Note:
By default, the system selects the large focal spot when a contact exam is selected, and the small
focal spot when magnification is selected. Exposures are not possible if these settings are overrid-
den.
Note:
GE recommends that Standard (STD) and Dose (DOSE) modes be used for routine mammogra-
phy. The Senographe DS Contrast (CNT) mode delivers more dose than Standard and Dose
modes. GE recommends that Contrast mode be used only after consultation with an interpreting
physician or radiologist.
Note:
To fulfill the requirements of certain countries, access to Contrast Mode can be restricted as de-
scribed in the Service Documentation.
CAUTION
Breast compression of at least 3 daN (30 newtons or 6.7 pounds) is essential when using
the AOP mode.
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