3. Description of the QABrowser
Real-time Display and Waveforms
2012-10/4.3A
59
Barracuda & QABrowser Reference Manual
The first thing to do before starting to measure, is to verify that the Multi-Purpose
Detector is placed correctly in the X-ray field. A special function is available to do
this. Position the MPD under the tube as described in the topic Setting Up the
Barracuda .
The Position Check is usually not necessary for Radiography, but often
essential for the other modalities, in order to get more accurate
measurements. To skip go to 8.
5. Tap the kV-range selector, and a list will appear, as
shown left. Tap Check[C] to select the MPD
position check.
6. The Position Check screen is now shown. Set up
the X-ray generator. Recommended kV is:
· Radiography: use 70 kV
· Mammography: use 28 kV
· CT: use 120 kV (or any other available kV
setting).
7. Make an exposure. A message will be shown. If the
detector is incorrectly aligned, the QABrowser will
tell you to re-position the detector. For a small
misalignment a correction factor is applied and you
are allowed to continue without re-positioning the
detector. This message disappears automatically if
the position is OK.
If the displayed number is between 0.950 and 1.050 the position is acceptable and a
correction factor will be applied to correct the position to "1.000". The correction factor
is valid until you perform this check again or until you quit the QABrowser. It is
recommended to perform the position check after any repositioning of the detector or
after change of target/filter combination when measuring on a mammography unit.
You are now ready to make the first exposure. Set the generator to 80 kV. Make sure
that the correct kV range is used, in this case "R1[4] 45-125". When you make the first
exposure, the Barracuda will evaluate what kind of waveform it is (DC/HF,
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