5. Measurements with the Barracuda System
Mammography
Barracuda & QABrowser Reference Manual
2012-10/4.3A
140
6. Make an exposure. The RTI logo flashes to
indicate that the Barracuda has detected the
exposure.
7. Read the dose value. Note that if a R100 is
used the dose reading has to be corrected
manually according to the R100
DETECTOR DATA manual.
You may store the correction as a
Beam Correction Factor in a Favourite for a
specific kV, to do the correction
automatically.
8. Repeat the measurement for other generator settings.
To get a good HVL value, using the R100, you must correct it according
to the tables in the R100 DETECTOR DATA manual. It is often more
convenient to measure HVL with the MPD using the built-in HVL
application.
5.6.5 HVL Application
HVL is calculated in the standard way using an HVL stand and a set of Aluminium
filters.
Using the MPD and the built-in HVL application is recommended since a
correct HVL value is then obtained without any manual corrections.
Set up the system the same way as described above to measure dose in
mammography beams. Depending of what protocol is used you can use the HVL stand
or place the filters on the compression paddle.
1. From the dose real-time display tap the Appl button.
2. Select HVL.
3. The HVL application appears.
4. Perform exposures and add filter according
to the information in the HVL application.
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