5. Measurements with the Barracuda System
Mammography
Barracuda & QABrowser Reference Manual
2012-10/4.3A
146
Dental and Panoramic Dental5.7
This topic will describe how to measure kVp, dose, and time for a Dental and
Panoramic Dental X-ray units using the MPD only.
Set up the Barracuda and the handheld computer according to the description in
Setting Up the Barracuda . To measure kVp for a dental unit is similar to measuring
for a radiography units with the difference that the output level is much lower and the
total filtration is normally around 2 mm Al.
The setup is straightforward and also to get the measured value. Most dental units is
still single phase self-rectified and has 100 % radiation and kV ripple. In the case of
one-phase dental units it is common that only the exposure time can be changed. In
most cases the set tube voltage and current is fixed to about 65 kVp and 8 mA. A
challenge can exist how to find a definition what measured value should be used.
Furthermore the radiation output and the kV waveform are not stable for the first
200 ms or so, because that the tube filament current in most cases is not regulated.
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