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. 2021 Dec 1;50(8):20210117.
doi: 10.1259/dmfr.20210117. Epub 2021 Jul 20.

The empirical formula for calculating the incident air Kerma in intraoral radiographic imaging

Zoran Mirkov  1 , Katarina M Rajković  2 , Jovan B Stanković  3 , Dario Faj  4   5
Affiliations

The empirical formula for calculating the incident air Kerma in intraoral radiographic imaging

Zoran Mirkov et al. Dentomaxillofac Radiol. .

Abstract

Objectives: The aim of this paper is to determine the empirical formula for calculating the incident air kerma (Ki), used as a patient dose descriptor in the intraoral radiographic imaging.

Methods: The data for the formula were collected during the regular annual inspection of intraoral dental X-ray units in 2018, 2019 and early 2020. The measurement data of 50 X-ray units were processed to develop the formula. Exposure factors for imaging molars of the upper jaw of an average patient in a clinical setting were used in the measurement. The formula validity was statistically evaluated using coefficient of correlation, standard error of the fitted function and the mean relative percentage deviation.

Results: The measurement values of the radiation doses and calculated values obtained by using the final formula showed good agreement - the mean relative percentage deviation values less than ±15%.

Conclusions: Although there are differences in X-ray units, voltages, manufacturers and device architectures (single-phase and high-frequency), the measurement data comply well with computed ones in all cases.

Keywords: Air kerma; Dental x-ray; Intraoral; Ionising Radiation.

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Figures

Figure 1.
Figure 1.
The 3D plots for measured radiation doses (Ki) as a function of the X-ray peak tube voltage (V) and the exposure current and time product, (Ixt), visual representation in support of an empirical formula (1); surface fitting (a) and residual plot (b).
Figure 2.
Figure 2.
Diagnostic plots of measurement and calculated values of radiation doses (R).
See this image and copyright information in PMC

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