GE Healthcare
Senographe DS Acquisition System
Revision 1
Operator Manual 5307907-3-S-1EN
Image Acquisition Procedure
12-imgac.fm
Page no. 129
Chapter 12
4-5
Mammary implants
Use of AOP mode is not recommended for examinations of patients with mammary implants. Manual
mode should be used.
5
Manual Mode
The Manual Mode can be used for standard exposures, implant views, magnified exposures, for the
examination of the chest wall, and for examination of biopsy specimens and cores. See section
for additional notes on configuration.
The operator selects the following parameters:
•
Focal track (Mo, Rh)
•
Filter (Mo, Rh)
•
kV
•
mAs
Note:
By default, the system selects the large focal spot (0.3) when a standard exam is selected, and the
small focal spot (0.1) when magnification is selected. Exposures are not possible if these settings
are overridden.
Select the desired track/filter configuration according to the thickness and density of the breast to be
examined, then select suitable kV and mAs values.
Note that while the examination of a very dense breast using the rhodium or molybdenum tracks pro-
vides similar contrast images, the same breast examined via the rhodium track benefits from better tis-
sue visualization and a lower average glandular dose.
Refer toTable
1 Suggested manual techniques on page 130
below for suggested parameter selections
according to breast type and thickness.
Table
2 Maximum and recommended kV ranges on page 130
lists available maximum and recom-
mended kV ranges.
For thick (>6 cm) or dense breasts, the Mo/Rh and Rh/Rh configurations may provide equivalent or bet-
ter image quality with reduced patient dose.
Although subject contrast depends on the kV value used, note that an increase in the kV value may
reduce the radiation dose to the patient. Potential contrast losses will be handled by digital image pro-
cessing.
A reduction in the kV value improves contrast but increases the radiation dose to the patient.
In Manual mode, the choice of priority to dose reduction or to the desired contrast is left to the discretion
of the operator.
Note:
If the operator makes a filter selection error, the system automatically changes the filter. A warning
message appears on the first line of the console readout.
FOR
TRAINING
PURPOSES
ONLY!
NOTE:
Once
downloaded,
this
document
is
UNCONTROLLED,
and
therefore
may
not
be
the
latest
revision.
Always
confirm
revision
status
against
a
validated
source
(ie
CDL).
