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Erschienen in: European Radiology 1/2017

23.04.2016 | Physics

Determination of size-specific exposure settings in dental cone-beam CT

verfasst von: Ruben Pauwels, Reinhilde Jacobs, Ria Bogaerts, Hilde Bosmans, Soontra Panmekiate

Erschienen in: European Radiology | Ausgabe 1/2017

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Abstract

Objectives

To estimate the possible reduction of tube output as a function of head size in dental cone-beam computed tomography (CBCT).

Methods

A 16 cm PMMA phantom, containing a central and six peripheral columns filled with PMMA, was used to represent an average adult male head. The phantom was scanned using CBCT, with 0-6 peripheral columns having been removed in order to simulate varying head sizes. For five kV settings (70-90 kV), the mAs required to reach a predetermined image noise level was determined, and corresponding radiation doses were derived. Results were expressed as a function of head size, age, and gender, based on growth reference charts.

Results

The use of 90 kV consistently resulted in the largest relative dose reduction. A potential mAs reduction ranging from 7 % to 50 % was seen for the different simulated head sizes, showing an exponential relation between head size and mAs. An optimized exposure protocol based on head circumference or age/gender is proposed.

Conclusions

A considerable dose reduction, through reduction of the mAs rather than the kV, is possible for small-sized patients in CBCT, including children and females. Size-specific exposure protocols should be clinically implemented.

Key Points

Fixed exposure settings in CBCT results in overexposure for smaller patients
For children, considerable dose reduction is possible without compromising image quality
A reduction in mAs is more dose-efficient than a kV reduction
An optimized exposure protocol was proposed based on phantom measurements
This protocol should be validated in a clinical setting
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Metadaten
Titel
Determination of size-specific exposure settings in dental cone-beam CT
verfasst von
Ruben Pauwels
Reinhilde Jacobs
Ria Bogaerts
Hilde Bosmans
Soontra Panmekiate
Publikationsdatum
23.04.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
European Radiology / Ausgabe 1/2017
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-016-4353-z

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