CHAP
. 4
GE Healthcare
Senographe 2000 D Acquisition System
REV 1
OM 5179217–1–100
49
kV and mAs Readout
D
In manual mode
the readout displays the kV and mAs values selected by the
operator.
D
When an AOP mode is selected,
the kV readout displays the code of the selected
mode: CNT (Contrast), DOSE, or STD (Standard). The mAs readout displays AUTO.
D
At end of exposure,
the kV readout displays the kV values selected and the first
letter of the code of the selected mode (C, D, or S); the mAs readout displays the
mAs value.
kV selection
D
In manual mode,
turn the kV knob to select the required kV value; the displayed
value changes as the knob is turned. Available values are 22 kV through 49 kV in
steps of 1 kV. There is no mechanical stop; you can continue to turn the knob past
the minimum or maximum value (22 kV or 49 kV), but the displayed value no longer
changes.
D
In AOP mode,turning
the knob has no effect.
mAs selection
D
In manual mode,
turn the mAs knob to select the required mAs value; the displayed
value changes as the knob is turned. Available values are 4 mAs through 500 mAs,
but some parameter selections may change these limits, e.g. the X–ray Console can
display as high as 600 mAs whereas the exposure is automatically limited to 500
mAs. There is no mechanical stop; you can continue to turn the knob past the
minimum or maximum value, but the displayed value no longer changes.
D
In AOP mode,
turning the knob has no effect.
AOP and Manual Mode selection
Press the key to step through the four possible modes; three AOP modes and Manual mode.
D
Three AOP modes
are available, according to the
priority
required
:
CNT:
Contrast. Priority is given to optimum subject contrast.
STD:
Standard. Gives a compromise between good contrast and dose reduction.
DOSE
: Dose. Priority is given to dose reduction.
At the start of compression, the selected priority code is displayed on the kV readout.
When the exposure is complete, the initial letter of the code selected is displayed on
the kV readout.
D
Manual mode
is used to manually select kV and mAs values.
Breast compression is essential when using the AOP mode. Refer to the Caution on
use of compression in the AOP section of Chapter 10
.
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