Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography
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: Ent...
| Main Authors: | , , , , |
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| Format: | Article |
| Sprog: | English |
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Shiraz University of Medical Sciences
2019-02-01
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| Serier: | Journal of Biomedical Physics and Engineering |
| Fag: | |
| Online adgang: | http://jbpe.ir/Journal_OJS/JBPE/index.php/jbpe/article/view/691/403 |
| _version_ | 1828374205736943616 |
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| author | Ghanbarnezhad Farshi R. Mesbahi A. Johari M. Kara Ü. Gharehaghaji N. |
| author_facet | Ghanbarnezhad Farshi R. Mesbahi A. Johari M. Kara Ü. Gharehaghaji N. |
| author_sort | Ghanbarnezhad Farshi R. |
| collection | DOAJ |
| description | 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 |
| first_indexed | 2024-04-14T07:29:33Z |
| format | Article |
| id | doaj.art-d27daebb08c247b7903e5db50b909625 |
| institution | Directory Open Access Journal |
| issn | 2251-7200 2251-7200 |
| language | English |
| last_indexed | 2024-04-14T07:29:33Z |
| publishDate | 2019-02-01 |
| publisher | Shiraz University of Medical Sciences |
| record_format | Article |
| series | Journal of Biomedical Physics and Engineering |
| spelling | doaj.art-d27daebb08c247b7903e5db50b9096252022-12-22T02:05:54ZengShiraz University of Medical SciencesJournal of Biomedical Physics and Engineering2251-72002251-72002019-02-01915160Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed TomographyGhanbarnezhad Farshi R.0Mesbahi A.1Johari M.2 Kara Ü.3Gharehaghaji N.4Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, IranMedical Physics Department, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, IranDepartment of Oral & Maxillofacial Radiology, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, IranVocational School of Health Services, Suleyman Demirel University, Isparta, TurkeyRadiology Department, Paramedical Faculty, Tabriz University of Medical Sciences, Tabriz, IranBackground: 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 dosehttp://jbpe.ir/Journal_OJS/JBPE/index.php/jbpe/article/view/691/403Cone-Beam Computed TomographyRadiation DosimetryEntrance Surface DoseThermoluminescent DosimetryMaxillofacial ImagingDentistry |
| spellingShingle | Ghanbarnezhad Farshi R. Mesbahi A. Johari M. Kara Ü. Gharehaghaji N. Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography Journal of Biomedical Physics and Engineering Cone-Beam Computed Tomography Radiation Dosimetry Entrance Surface Dose Thermoluminescent Dosimetry Maxillofacial Imaging Dentistry |
| title | Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography |
| title_full | Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography |
| title_fullStr | Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography |
| title_full_unstemmed | Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography |
| title_short | Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography |
| title_sort | dosimetry of critical organs in maxillofacial imaging with cone beam computed tomography |
| topic | Cone-Beam Computed Tomography Radiation Dosimetry Entrance Surface Dose Thermoluminescent Dosimetry Maxillofacial Imaging Dentistry |
| url | http://jbpe.ir/Journal_OJS/JBPE/index.php/jbpe/article/view/691/403 |
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