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open access
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ISSN : 0376-4672
Objective: The purpose of the study was to calculate the effective and absorbed organ doses of cone-beam computed tomography (CBCT) in pediatric patient using personal computer-based Monte Carlo (PCXMC) software and to compare them with those measured using thermoluminescent dosimeters (TLDs) and anthropomorphic phantom. Materials and Methods: Alphard VEGA CBCT scanner was used for this study. A large field of view (FOV) (20.0 cm x 17.9 cm) was selected because it is a commonly used FOV for orthodontic analyses in pediatric patients. Ionization chamber of dose-area product (DAP) meter was located at the tube side of CBCT scanner. With the clinical exposure settings for a 10-year-old patient, DAP value was measured at the scout and main projection of CBCT. Effective and absorbed organ doses of CBCT at scout and main projection were calculated using PCXMC and PCXMCRotation software respectively. Effective dose and absorbed organ doses were compared with those obtained by TLDs and a 10-year-old child anthropomorphic phantom at the same exposure settings. Results: The effective dose of CBCT calculated by PCXMC software was 292.6 μSv, and that measured using TLD and anthropomorphic phantom was 292.5 μSv. The absorbed doses at the organs largely contributing to effective dose showed the small differences between two methods within the range from –18% to 20%. Conclusion: PCXMC software might be used as an alternative to the TLD measurement method for the effective and absorbed organ dose estimation in CBCT of large FOV in pediatric patients.
1. Arai Y, Tammisalo E, Iwai K, Hashimoto K, Shinoda K. Development of a compact computed tomographic apparatus for dental use. Dentomaxillofac Radiol 1999;28:245-248.
2. Lofthag-Hansen S, Grondal K, Ekestubbe A. Cone-beam CT for preoperative implant planning in the posterior mandible: visibility of anatomic landmarks. Clin Implant Dent Relat Res 2009;11:246-255.
3. Momin MA, Matsumoto K, Ejima K, Asaumi R, Kawai T, Arai Y, Honda K, Yosue T.Correlation of mandibular impacted tooth and bone morphology determined by cone beam computed topography on a premise of third molar operation. Surg Radiol Anat 2013;35:311-318.
4. Patel S, Dawood A, Whaites E, Ford T. New dimensions in endodontic imaging: part 1. Conventional and alternative radiographic systems. Int Endod J. 2009;42:447-462.
5. Silva MA, Wolf U, Heinicke F, Bumann A, Visser H, Hirsch E. Cone-beam computed tomography for routine orthodontic treatment planning: a radiation dose evaluation. Am J Orthod Dentofacial Orthop 2008;133:640.e1-5.
6. Radiation protection No. 172. Evidence based guidelines on cone beam CT for dentaland maxillofacial radiology. [Internet]. Luxemburg: European commission; 2012 [cited 2020 January 1]. Available from: https://ec.europa.eu/energy/sites/ener/files/documents/172.pdf
7. 김은경. 소아환자에서 교정분석을 위한 콘빔CT 촬영시 유효선량에 관한 연구. 대한치의사협회지 2015;53:558-568.
8. Ludlow JB, Davis-Ludlow LE, Brooks SL, Howerton WB. Dosimetry of 3 CBCT devices for oral and maxillofacial radiology: CB Mercuray, NewTom 3G and i-CAT. Dentomaxillofac Radiol 2006;35:219-226.
9. Ludlow JB, Ivanovic M. Comparative dosimetry of dental CBCT devices and 64-slice CT for oral and maxillofacial radiology. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008;106:106-114.
10. Roberts JA, Drage NA, Davies J, Thomas DW. Effective dose from cone beam CT examinations in dentistry. Br J Radiol 2009;82:35-40.
11. Loubele M, Bogaerts R, Van Dijck E, Pauwels R, Vanheusden S, Suetens P, Marchal G, Sanderink G, Jacobs R. Comparison between effective radiation dose of CBCT and MSCT scanners for dentomaxillofacial applications. Eur J Radiol 2009;71:461-468.
12. Qu XM, Li G, Ludlow JB, Zhang ZY, Ma XC. Effective radiation dose of ProMax 3D cone-beam computerized tomography scanner with different dental protocols. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2010;110:770-776.
13. Pauwels R, Beinsberger J, Collaert B, Theodorakou C, Rogers J, Walker A, Cockmartin L, Bosmans H, Jacobs R, Bogaerts R, Horner K, The SEDENTEXCT Project Consortium. Effective dose range for dental cone beam computed tomography scanners. Eur J Radiol 2012;81:267-271.
14. Jeong DK, Lee SC, Huh KH, Yi WJ, Heo MS, Lee SS, Choi SC. Comparison of effective dose for imaging of mandible between multi-detector CT and cone-beam CT. Imaging Sci Dent 2012;42:65-70.
15. Kim DS, Rashsuren O, Kim EK. Conversion coefficients for the estimation of effective dose in cone-beam CT. Imaging Sci Dent 2014;44:21-29.
16. Ludlow JB, Timothy R, Walker C, Hunter R, Benavides E, Samuelson D, Scheske MJ. Effective dose of dental CBCT — a meta analysis of published data and additional data for nine CBCT units. Dentomaxillofac Radiol. 2015;44:20140197.
17. Martin CJ. Effective dose: how should it be applied to medical exposures? Br J Radiol 2007;80:639-647.
18. Koivisto J, Kiljunen T, Tapiovaara M, Wolff J, Kortesniemi M. Assessment of radiation exposure in dental cone-beam computerized tomography with the use of metal-oxide semiconductor field-effect transistor (MOSFET) dosimeters and Monte Carlo simulations. Oral Surg Oral Med Oral Pathol Oral Radiol 2012;114:393-400.
19. Kim EK. Han WJ. Choi JW. Battulga B. Estimation of the effective dose of dental cone-beam computed tomography using personal computer-based Monte Carlo software. Imaging Sci Dent 2018;48:21-30.
20. Vassileva J, Stoyanov D. Quality control and patient dosimetry in dental cone beam CT. Radiat Prot Dosimetry 2010;139:310-312.
21. Aps JK, Scott JM. Oblique lateral radiographs and bitewings; estimation of organ doses in head and neck region with Monte Carlo calculations. Dentomaxillofac Radiol 2014;43:20130419.
22. Lee C, Lee SS, Kim JE, Huh KH, Yi WJ, Heo MS, Choi SC. Comparison of dosimetry methods for panoramic radiography: thermoluminescent dosimeter measurement versus personal computer-based Monte Carlo method calculation. Oral Surg Oral Med Oral Pathol Oral Radiol 2016;121:322-329.
23 Kawasaki T, Aoyama T, Yamauchi-Kawaura C, Fujii K, Koyama S. Organ dose and effective dose estimation in paediatric chest radiographic examinations by using pin silicon photodiode dosemeters. Radiat Prot Dosimetry 2013;154:314-319.
24. Okano T, Matsuo A, Gotoh K, Yokoi M, Hirukawa A, Okumura S, Koyama S. Comparison of absorbed and effective dose from two dental cone beam computed tomography scanners. Nihon Hoshasen Gijutsu Gakkai Zasshi 2012;68:216-225. (Article in Japanese)
25. Reeves TE, Mah P, McDavid WD. Deriving Hounsfield units using grey levels in cone beam CT: a clinical application. Dentomaxillofac Radiol 2012;41:500-508.
26. Tapiovaara M, Siiskonen T. PCXMC, a Monte Carlo program for calculating patient doses in medical X-ray examinations, 2nd ed. STUK-A231. [Internet] STUK. Helsinki; 2008 [cited 2020 January 1]. Available from https://www.stuk.fi/documents/12547/474783/stuk-a231.pdf/c950e99c-3537-4344-bf76-07a54e5f1afa?t=1439557836831.
27. Tapiovaara M. PCXMC 2.0 supplementary programs user's guide. [Internet] STUK. Helsinki; 2012 [cited 2020 January 1]. Available from https://www.stuk.fi/documents/12547/474783/PCXMC_20_Supplementary_programs_UsersGuide.pdf/
28. The 2007 Recommendations of the International Commission on Radiological Protection. ICRP Publication 103. Ann ICRP. 2007;37(2-4):1-332.