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Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography

Document Type : Original Research

Authors

1 Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

2 Medical Physics Department, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran

3 Department of Oral & Maxillofacial Radiology, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran

4 Vocational School of Health Services, Suleyman Demirel University, Isparta, Turkey

5 Radiology Department, Paramedical Faculty, Tabriz University of Medical Sciences, Tabriz, Iran

Abstract

Background: While the benefits of cone-beam computed tomography (CBCT) are well known in maxillofacial imaging, the use of this modality is not risk-free.
Objective: The aim of this study was to evaluate the exposure doses received by patients during maxillofacial imaging with CBCT.
Methods: Entrance surface dose (ESD) was measured by using thermoluminescent dosimeters (TLDs) attached to the eyes lids, parotid glands and thyroid of 64 patients in two imaging centers (A and B). Phantom dosimetry was performed by a cylindrical poly-methyl methacrylate (PMMA) head-size phantom and an ionization chamber for different exposure parameters. NewTom VGi and Planmeca Promax 3D CBCT scanners were used at centers A and B, respectively.
Results: The mean ESD of the eyes, parotid glands and thyroid were 2.57, 2.33 and 0.28 mGy in center A, 0.35, 2.11 and 0.37 mGy in center B, respectively. ESD of the eyes revealed a significant difference in two centers; in center B, it was 86.4% lower than center A. In the phantom dosimetry, the measured doses of NewTom VGi were 2.63 and 2.08 mGy, respectively by changing field of view (FOV) size from 8×8 cm2 (height × diameter) to 6×6 cm2. For Planmeca Promax 3D, it ranged from 0.98 to 3.24 mGy depending on exposure parameters.
Conclusion: There is a wide range of radiation doses dependent on the units, patients and selected scan parameters. Inappropriate selection of exposure settings, especially FOV size, can seriously increase patient dose.

Keywords

References
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Journal of Biomedical Physics and Engineering
Volume 9, Issue 1 - Serial Number 1
31
February 2019
Pages 51-60
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