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Ghanbarnezhad Farshi, R, Mesbahi, A, Johari, M, Kara, Ü, Gharehaghaji, N. (1397). Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography. سامانه مدیریت نشریات علمی, 9(1), 51-60. doi: 10.31661/jbpe.v9i1Feb.691
R Ghanbarnezhad Farshi; A Mesbahi; M Johari; Ü Kara; N Gharehaghaji. "Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography". سامانه مدیریت نشریات علمی, 9, 1, 1397, 51-60. doi: 10.31661/jbpe.v9i1Feb.691
Ghanbarnezhad Farshi, R, Mesbahi, A, Johari, M, Kara, Ü, Gharehaghaji, N. (1397). 'Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography', سامانه مدیریت نشریات علمی, 9(1), pp. 51-60. doi: 10.31661/jbpe.v9i1Feb.691
Ghanbarnezhad Farshi, R, Mesbahi, A, Johari, M, Kara, Ü, Gharehaghaji, N. Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography. سامانه مدیریت نشریات علمی, 1397; 9(1): 51-60. doi: 10.31661/jbpe.v9i1Feb.691

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

Journal of Biomedical Physics and Engineering
مقاله 6، دوره 9، شماره 1، اردیبهشت 2019، صفحه 51-60    اصل مقاله (544.07 K)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v9i1Feb.691
نویسندگان
R Ghanbarnezhad Farshi1، 2؛ A Mesbahi2؛ M Johari3؛ Ü Kara4؛ N Gharehaghaji* 5
1Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
2Medical Physics Department, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
3Department of Oral & Maxillofacial Radiology, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
4Vocational School of Health Services, Suleyman Demirel University, Isparta, Turkey
5Radiology Department, Paramedical Faculty, Tabriz University of Medical Sciences, Tabriz, Iran
چکیده
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.
کلیدواژه‌ها
Cone-Beam Computed Tomography؛ Radiation Dosimetry؛ Entrance Surface Dose؛ Thermoluminescent Dosimetry؛ Maxillofacial Imaging؛ Dentistry
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