GE SENOGRAPHE 800T, Operator'S Manual

Page: 41 / 82

PREP
ARING
AN EXAMINA
TION
GE Medical Systems SENOGRAPHE 800T
REV 6 om 2135575–100
2–3
The AOP Mode has three options:
Contrast (CNT): Contrast priority
Standard (STD): Compromise between contrast and dose.
Dose (DOSE): Dose reduction priority
For each of the above options and as a function of the breast composition, the AOP Mode
selects the filter/kV configuration.
The operator selects:
Priority (CNT, STD, DOSE).
Focal spot,
Screen-film combination.
Density correction, when necessary.
Density correction is used only when an optical density change in the image is required.
Breast compression is essential when using the AOP Mode.
The system displays inhibited messages and automatically selects the following parameters:
Filter (Mo, Rh),
kV values,
mAs values.
The AOP Mode can be used for standard exposures, magnified exposures, or for the
examination of the chest wall.
For standard exposures, the Bucky must be used.
In magnification, use of the Bucky is not recommended. The operator should use the cassette
holder.
Always make sure that the magnification plate is correctly locked in place before starting an
exam.
The system automatically selects the small focal spot (0.1) when magnification is
selected, i.e. when the appropriate small focal spot collimator diaphragm is inserted into
the collimator slot.
The system automatically selects the large focal spot (0.3) when a 0.3 collimator diaphragm is
inserted.
To maintain optimal image quality, the user must check on the control panel display that
the selected focal spot is dedicated to the selected examination mode: Contact
examination (normal) = 0.3. Magnification = 0.1
2–2 AEC Mode
The Automatic Exposure Control (AEC) Mode controls density (mAs) and provides
exposures of constant optical density.
CAUTION