A Study about the Elimination of Component External Calibration in Intraoral Imaging Plate Scanner
Nguyen, Doan (2018)
Nguyen, Doan
Metropolia Ammattikorkeakoulu
2018
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201802021940
https://urn.fi/URN:NBN:fi:amk-201802021940
Tiivistelmä
This thesis describes the process of how the external calibration of component in intraoral imaging plate scanner or photomultiplier tube (PMT) in specific could be eliminated using measurements and statistics. The result of this thesis will be applied to the new intraoral imaging plate scanner where the lean methodology should be fulfilled.
Three photomultipliers (PMT) with manufacturer’s measurement data were taken to perform the required tests. These tests were implemented in such a way that input X-ray dose level and supply voltage (HV) to the photomultiplier tubes were fluctuating in order to examine the behaviour of the system output signal.
Following that, the high voltage tolerance window was evaluated based on repeatability tests with three chosen tubes.
Finally, after analysing the output signal, the variation between manufacturer’s measurements and Kavo Kerr measurements was in the tolerance window. Therefore, elimination of the calibration process of photomultiplier tube in production line is feasible.
Three photomultipliers (PMT) with manufacturer’s measurement data were taken to perform the required tests. These tests were implemented in such a way that input X-ray dose level and supply voltage (HV) to the photomultiplier tubes were fluctuating in order to examine the behaviour of the system output signal.
Following that, the high voltage tolerance window was evaluated based on repeatability tests with three chosen tubes.
Finally, after analysing the output signal, the variation between manufacturer’s measurements and Kavo Kerr measurements was in the tolerance window. Therefore, elimination of the calibration process of photomultiplier tube in production line is feasible.