5. Measurements with the Piranha System
Dental and Panoramic Dental
2014-06/5.5C
127
Piranha & QABrowser Reference Manual
Special fixation rods for the head should be placed so that they are not in the beam
during the scan or can hit the detector. In most cases the control panel have a special
scan mode without X-ray so the mechanical set up can be tested.
Another important issue to be aware of is that a dental panoramic system normally
compensates the for the thicker penetrating neck region in the patient when it makes its
scan. This means that some units actually increase its tube voltage a short moment
during the scan, other use different mA or scan speeds when the scanning beam
passes the neck region. Newer digital system can actually measure patients X-ray beam
attenuation dynamically and change the output level automatically during the scan.
The Piranha has addressed these challenges. Since the panoramic scan has an
exposure time of about 10 to 20 seconds, the Piranha is set up to continuously update
the display during the scan. It is preferable to select a single parameter display and
angle the Palm holder, making it easy to read the values during the scan, from a
distance.
You can always trust the kV reading of a dental measurement. This is true since
Piranha can automatically detect whether the detector area is not fully uniformly
radiated or not by means of the Position Check, and also compensates for the beam
filtration during the scan.
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