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4
In mammography, the PDP should only be used for measurements involving the IQST
phantom. All other measurements, of kVp, dose, and HVL, should be performed with the
internal detector.
Since the Piranha system has a variety of usage options, we strongly recommend the
usage of favourites. Favourites/templates are stored measurement setups that allow the
user to work more efficiently without having to worry about a correct setup. For
information on how to use a favourite, see section 1.3.
The favourites/templates you should use are normally distributed when the system is
delivered but you can also contact your local representative or RTI to acquire them.
Where to add the different beam correction factors in the software and how to store a
favourite is described in the Piranha manual.
1.3. How to Use a Favourite
When you start your RTI software (QABrowser or oRTIgo) you will be presented by a list
of favourites. In the screenshot below you see what such a list may look like in oRTIgo.
First make sure that you are in the correct favourite-group and then select the favourite
you wish to use, for example “
IQST w PDP Rh/Rh 30 kV
”.
1.4. Radiography and Fluoroscopy Systems
In all cases where the ion chambers have been used before, the external detector
should be used instead.
See the second part of this manual for the setup using the PDP Holder (points 2-6).
Please note that the PDP also works very well for measurements of skin dose in the
range of 60-120 kV and with the filtration varying from 0-0.9 mm Cu.
For measuring kV, use the setup described under point 7 in the chapter 2 of this manual.
For more info, see further in the Piranha Reference Manual.
Note
: On small OEC image intensifiers, it is of great importance to lock the AEC
manually before measuring. This is done to ensure correct dose rate values. The extra
filtration introduced by the PDP may otherwise affect output of the X-ray system.
Piranha Dose Probe Holder User’s Manual
2009-09/1.0B