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SETTING THE EXPOSURE VALUES AND SELECTING THE VIEW
13 SETTING THE EXPOSURE VALUES AND SELECTING
THE VIEW
This section describes how to select the desired
exposure parameters and viewing angle, and how to
prepare the X-ray unit for patient positioning and
exposure. See also Planmed Nuance Acquire User’s
Manual.
13.1 Setting the exposure values
To set the exposure values:
1. Press the automatic/manual exposure key to select
the desired automatic exposure control (AEC) mode if
it is not already selected.
With conventional AEC the correct kV must be
selected before exposure, and with the AAEC mode
the kV value will be automatically selected before, and
adjusted during, the exposure.
When the AEC mode has been selected the correct
mAs value will appear on the mAs-display after the
exposure.
For more information about the AEC modes and user
settings, see section 16 “FLEX AEC PRINCIPLES
AND USER SETTINGS” on page 63.
2. Select the focal spot you require. The appropriate
indicator light will come on. Remember that when you
change the focal spot, the key must be pressed and
held down for 4 seconds.
3. If you are using the conventional AEC mode, select the
kV value required for the patient to be examined.
NOTE When starting a new examination a message
“Caution! Manual exposure mode on” appears in
case an exposure is not taken in AEC or AAEC
mode. The message will disappear automatically
when pushing the exposure button. Alternatively
you may close the message window by clicking on
the cross located in the upper right corner of the
window.
NOTE You can set the X-ray unit so that it will
automatically display a recommended kV value
after the breast has been compressed. See section
16.2.2 “Automatic kV Selection in AEC mode” on
page 65.
4. Make sure that filtration you are using is appropriate
for the kV value that you have selected. If necessary,
change the filtration.
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