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
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
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DOI：
10.1016/j.oooo.2012.06.003
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发表时间：
2012-09-01
影响因子：
2.9
通讯作者：
Kortesniemi, M.
中科院分区：
文献类型：
--
作者：
Koivisto, J.;Kiljunen, T.;Kortesniemi, M.
目标。这项研究的目的是评估使用一种新型金属氧化物半导体场效应晶体管(MOSFET)剂量计设备进行的牙科锥束计算机断层扫描(CBCT)所产生的器官和有效剂量(国际放射防护委员会(ICRP)103)，并通过与蒙特卡洛PCXMC模拟结果的比较来评估MOSFET测量的可靠性。器官剂量测量使用20个MOSFET剂量计，嵌入在颌面部和颈部最敏感的8个器官中。从CBCT扫描获得的剂量-面积乘积(DAP)值用于PCXMC模拟。然后将获得的MOSFET剂量与蒙特卡罗模拟进行比较。用MOSFET剂量计测量的有效剂量为153mU Sv，步长为0.5 cm，PCXMC模拟得到136mU Sv。放置在头部模型中的MOSFET剂量计给出了类似于蒙特卡罗模拟的结果。体模位置的微小垂直变化对总体有效剂量有很大影响。因此，MOSFET剂量计是一种可行的颌面部CBCT单元剂量评估方法。《口腔外科》《口腔医学》《口腔病理》《口腔放射学》2012；114：393-400)
Objectives. The aims of this study were to assess the organ and effective dose (International Commission on Radiological Protection (ICRP) 103) resulting from dental cone-beam computerized tomography (CBCT) imaging using a novel metal-oxide semiconductor field-effect transistor (MOSFET) dosimeter device, and to assess the reliability of the MOSFET measurements by comparing the results with Monte Carlo PCXMC simulations.Study Design. Organ dose measurements were performed using 20 MOSFET dosimeters that were embedded in the 8 most radiosensitive organs in the maxillofacial and neck area. The dose-area product (DAP) values attained from CBCT scans were used for PCXMC simulations. The acquired MOSFET doses were then compared with the Monte Carlo simulations.Results. The effective dose measurements using MOSFET dosimeters yielded, using 0.5-cm steps, a value of 153 mu Sv and the PCXMC simulations resulted in a value of 136 mu Sv.Conclusions. The MOSFET dosimeters placed in a head phantom gave results similar to Monte Carlo simulations. Minor vertical changes in the positioning of the phantom had a substantial affect on the overall effective dose. Therefore, the MOSFET dosimeters constitute a feasible method for dose assessment of CBCT units in the maxillofacial region. (Oral Surg Oral Med Oral Pathol Oral Radiol 2012;114:393-400)