Low-dose protocol of the spiral CT in orthodontics: comparative evaluation of entrance skin dose with traditional X-ray techniques

Giancarlo Cordasco, Marco Portelli, Angela Militi, Riccardo Nucera, Antonino Lo Giudice, Elda Gatto, Alessandra Lucchese, Giancarlo Cordasco, Marco Portelli, Angela Militi, Riccardo Nucera, Antonino Lo Giudice, Elda Gatto, Alessandra Lucchese

Abstract

Background: The aim of this study was to evaluate the amount of radiation doses absorbed by soft tissues (entrance skin dose) with a low-dose spiral computed tomography (CT) protocol compared to conventional X-ray techniques commonly used in orthodontics.

Methods: The amount of skin dose has been evaluated using a tissue-equivalent head-neck radiotherapy humanoid phantom with thermoluminescent dosimeters placed at the level of eye lens, parotid glands, and thyroid glands. CT images have been taken using a Sensation 16 Siemens CT scan and a low-dose protocol (15 mAs, 1 pitch, 2.5 mGy (CTDIvol), 80 kV, 1-mm slice thickness).

Results: The difference in image quality between traditional X-ray techniques and low-dose spiral CT was statistically significant (P<0.05). The difference in mean absorbed dose instead was not statistically significant.

Conclusions: Our protocol allows a more accurate orthodontic diagnosis without an increase of radiological risk for the patients in comparison to traditional X-ray techniques.

Figures

Figure 1
Figure 1
CT scan (Somaton Sensation 16 Siemens®).
Figure 2
Figure 2
CT images.

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