5. Measurements with the Piranha System
Tube Current Probes
2014-06/5.5C
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Piranha & QABrowser Reference Manual
5.8.2 MAS-2, Non-invasive mAs Probe
This section describes how to measure mAs, using the Piranha in the x-ray beam to
trigger the measurement. This means that the measurement starts when the Piranha
detects the radiation.
The MAS-2 probe uses a current clamp probe to measure mAs and mA non-invasively.
The MAS-2 probe is mostly used for mAs
measurements since it is not sensitive enough
to measure tube current on fluoroscopy. The
lowest tube current that can be measured with
MAS-2 is 10 mA. The figure to the left shows
the MAS-2 probe without the cable.
The parameter mAs is available for most type
of measurements but mAs is normally
measured only for X-ray exposures.
To measure tube charge (mAs) with the Piranha MAS-2 Probe
1. Connect the MAS-2 probe to the X-ray generator. Then power on the MAS-2 by
turning the range switch to the 4 A range and make a Reset of the MAS-2 probe by
pressing the yellow knob on the probe.
2. Connect the MAS-2 adapter cable to the Piranha.
3. Set up the Piranha and the handheld computer according to the description in Setting
Up the Piranha .
4. In the QABrowser select type of measurement.
5. Next select parameter mAs from the menu.
6. The real-time display for mAs is now displayed. Set the generator. Tap Reset. Make
an exposure.
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