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. 2017 May;21(4):1327-1333.
doi: 10.1007/s00784-016-1886-0. Epub 2016 Jun 21.

Skin entrance dose with and without lead apron in digital panoramic radiography for selected sensitive body regions

Ralf Kurt Willy Schulze  1 , Catrin Cremers  2 , Heiko Karle  3 , Hugo de Las Heras Gala  4
Affiliations

Skin entrance dose with and without lead apron in digital panoramic radiography for selected sensitive body regions

Ralf Kurt Willy Schulze et al. Clin Oral Investig. 2017 May.

Abstract

Purpose: The aim of this study was to compare the dose at skin level at five significant anatomical regions for panoramic radiography devices with and without lead apron by means of a highly sensitive dosimeter.

Materials and methods: A female RANDO-phantom was exposed in five different digital panoramic radiography systems, and the dose at skin level was assessed tenfold for each measurement region by means of a highly sensitive solid-state-dosimeter. The five measurement regions selected were the thyroid, both female breasts, the gonads, and a central region in the back of the phantom. For each panoramic machine, the measurements were performed in two modes: with and without a commercial lead apron specifically designed for panoramic radiography. Reproducibility of the measurements was expressed by absolute differences and the coefficient of variation. Values between shielded and unshielded doses were pooled for each region and compared by means of the paired Wilcoxon tests (p ≤ 0.05).

Results: Reproducibility as represented by the mean CV was 22 ± 52 % (median 2.3 %) with larger variations for small dose values. Doses at skin level ranged between 0.00 μGy at the gonads and 85.39 μGy at the unshielded thyroid (mean ± SD 15 ± 24 μGy). Except for the gonads, the dose in all the other regions was significantly lower (p < 0.001) when a lead apron was applied. Unshielded doses were between 1.02-fold (thyroid) and 112-fold (at the right breast) higher than those with lead apron shielding (mean: 14-fold ± 18-fold).

Conclusion: Although the doses were entirely very low, we observed a significant increase in dose in the radiation-sensitive female breast region when no lead apron was used. Future discussions on shielding requirements for panoramic radiography should focus on these differences in the light of the linear non-threshold (LNT) theory which is generally adopted in medical imaging.

Keywords: Dose measurement; Lead apron; Panoramic radiography; Radiation protection; Shielding.

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References

    1. Dentomaxillofac Radiol. 2013;42(9):20130265 - PubMed
    1. Breast Cancer Res. 2005;7(1):21-32 - PubMed
    1. Dentomaxillofac Radiol. 2013;42(10):20130302 - PubMed
    1. Oral Surg Oral Med Oral Pathol. 1987 May;63(5):617-21 - PubMed
    1. Ann ICRP. 2005;35(4):1-140 - PubMed

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