2. Description of the Piranha
Hardware and Specifications
2014-06/5.5C
13
Piranha & QABrowser Reference Manual
Hardware and Specifications2.4
Specifications are valid after a warm-up time of one minute and presuming reference
conditions. All specifications are for use together with the Piranha unless otherwise
stated. All specifications can be changed without prior notice. RTI Electronics AB
assumes no responsibility for any errors or consequential damages that may result from
the misuse or misinterpretation of any information contained in these specifications.
2.4.1 Piranha internal detector (Internal detector)
2.4.1.1 General
With the Piranha internal detector you will manage most of your measurements. Tube
voltage, exposure time, dose, and dose rate are measured for all kinds of modalities:
conventional radiography, fluoroscopy, pulsed fluoroscopy, cine, mammography, dental,
panoramic dental, and CT (kVp only, not dose and doserate). In one exposure, the
detector provides tube voltage, time, dose, dose rate, quick-HVL, and estimated total
filtration on radiographic, fluoroscopic, dental, and CT exposures. On pulsed radiation
and cine, also dose per pulse and pulse rate are measured. The Piranha internal
detector is very sensitive and can measure peak tube voltage for as low outputs as
50 kV / 0.050 mA at 50 cm.
Typically the exposure time has to be at least 5 ms to get a kVp value but it depends on
the waveform. On modern X-ray generators (high-frequency with fast rise and fall times)
the peak tube voltage can normally be measured with exposure time as short as 1 ms.
Dose and time values will be given for even shorter exposure times.
The estimations of total filtration and Quick-HVL are done from one single exposure
using a combination of detector and filters in the Piranha. In situations when the total
filtration cannot be automatically estimated, a "standard" HVL measurement may be
required. All measured kVp and dose values measured with the Piranha are
automatically compensated for the actual beam/radiation quality. This means that no
manual corrections of measured data is needed.
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