![background image](http://html1.mh-extra.com/html/rti/piranha/piranha_reference-manual_1497628137.webp)
5. Measurements with the Piranha System
Dental and Panoramic Dental
2014-06/5.5C
133
Piranha & QABrowser Reference Manual
8. Press the rewind button on the panoramic unit to take back the unit to start position.
9. Select kV, mA, and scan time.
10. Start the scan. A little triangle in the RTD indicates that the Piranha detects the
radiation. It is not needed to use the whole scan for the purpose of measure the kV
since the display is continuously updated.
11. Stop the panoramic dental unit. The RTI logo
flashes and the last kVp value is displayed. As
complementary information the estimated total
filtration is measured as well as the scan time.
The figure shows the RTD after a complete
scan.
The waveform is also automatically stored after the delay time in the beginning of the
scan or acquired when
Hold
is activated during the scan.
5.6.4
HVL, Total Filtration, and Quick-HVL
It is not unusual that the total filtration is as low as 2.0 mm Al on an dental unit,
compared to 2.5 to 3.5 mm on an normal radiography unit. The method that the Piranha
uses to estimate the total filtration in the range of 1.2 to 38 mm has an absolute
inaccuracy in order of ±0.3 mm, but is very straightforward to find an "unknown" filter in
the beam. You can always use the standard HVL method adding extra filter in the beam.
In that case, use the same procedure as described in the section for the normal
radiography measurement.
Summary of Contents for Piranha
Page 1: ...Reference Manual English Version 5 5C Piranha QABrowser RTI article number 9629050 10 ...
Page 8: ...Introduction Chapter 1 ...
Page 12: ...Description of the Piranha Chapter 2 ...
Page 40: ...Description of the QABrowser Chapter 3 ...
Page 77: ...Measurement Principles Theory Chapter 4 ...
Page 91: ...Measurements with the Piranha System Chapter 5 ...
Page 151: ...Optional Accessories Chapter 6 ...
Page 155: ...Problems and Solutions Chapter 7 ...
Page 161: ...Glossary Chapter 8 ...
Page 181: ...Notes Piranha QABrowser Reference Manual 2014 06 5 5C Notes 177 ...