5. Measurements with the Piranha System
Radiography
Piranha & QABrowser Reference Manual
2014-06/5.5C
100
As seen, the measured kVp value is within 0.4 kV for the different total filtration values.
Quick-HVL
If the parameter "All w. TF+HVL" is chosen, the QABrowser will display both estimated
total filtration and quick-HVL values for every measurement. Below a sequence of
measurements is shown displaying how the total filtration and HVL can be determined
at three different kV settings with only three exposures:
With the initial exposure the total filtration is displayed (6.8 mm Al) before the kVp is
displayed. Then the measured kVp is shown (117.0 kV) and the estimated total filtration
and HVL are shown as supplementary information. The HVL is calculated to be
6.42 mm Al. The set kV was changed and the Piranha measured 102.6 kV. The HVL is
calculated at 5.70 mm for this kV. The set kV is changed again and a third exposure is
made. The kV is measured to be 83.53 kV and the HVL is calculated to be 4.69 mm Al.
Notice that all three measurements of total filtration were 6.8 mm Al.
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