Aop - Automatic Optimization Of Parameters - GE Senographe DS Operator's Manual

GE Healthcare
Revision 1
4

AOP - Automatic Optimization of Parameters

4-1 AOP
Definition of
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 3 .Configuration on page 126
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.
AOP
4-2 Usage of
The operator chooses one of three modes, according to the priority required:
• CNT Contrast
• STD Standard
• DOSE Dose
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.
12-imgac.fm
for additional notes on configuration.
Mode
Gives priority to subject contrast.
Selects a compromise between contrast and dose.
Gives priority to dose reduction.
Page no. 127
Senographe DS Acquisition System
Operator Manual 5307907-3-S-1EN
Image Acquisition Procedure
Chapter 12