5. Measurements with the Barracuda System
Tube Current Probes
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Barracuda & QABrowser Reference Manual
Note that we are relatively close to the lower
limit for the MAS-2B probe and the signal
may look "noisy". The figure to the left shows
the waveform when the tube current has
been increased to 100 mA.
5.9.3 MAS-3, Non-invasive mAs Probe
This section describes how to measure mAs as single parameter. This means that the
measurement starts when the mAs-probe detects the tube current. The measurement
is performed in the same way if you use a multi-parameter display. In that case the
default trig is the MPD and what is said below about false triggering can be ignored.
The MAS-3 probe uses a current probe
connected to an adapter box to measure
mAs and mA non-invasively. The MAS-3 can
be used for both mAs and tube current
measurements. It is sensitive enough to
measure tube current on fluoroscopy.
The lowest tube current that can be measured with MAS-3 is 0.1 mA. The figure above
shows the MAS-3 probe and the adapter box. Read the MAS-3 User's Manual for a
detailed description and instructions how to set up and connect it.
The parameter mAs is available for most type of measurements but mAs is normally
measured only for X-ray exposures.
To measure mAs with the MAS-3:
1. Set up the Barracuda and the handheld computer according to the description in
Setting Up the Barracuda .
2. Connect the MAS-3 probe to the X-ray generator as described in the MAS-3 User's
Manual.
3. Connect the MAS-3 adapter box to the EMM module.
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