Absorbed and effective doses from cone beam volumetric imaging for implant planning
Absorbed and effective doses from cone beam volumetric imaging for implant planning
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DOI：
10.1259/dmfr/14769929
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发表时间：
2009-02-01
影响因子：
3.3
通讯作者：
Araki, K.
中科院分区：
文献类型：
--
作者：
Okano, T.;Harata, Y.;Araki, K.
目的：使用锥形束的容积CT已经由几家制造商开发用于牙颌面成像。本研究的目的是测量与传统的多探测器CT（MDCT）相比，锥形束容积成像（CBVI）的植入计划剂量。方法：使用的两种CBVI系统是3D Accuitomo（R）（J. Morita），包括图像增强器型（II）和平板型（FPD），以及CB MercuRay（R）（Hitachi）。3D Accuitomo（R）在80 kV、5 mA和18 s下运行。CB MercuRay（R）在120 kV、15 mA、9.8 s下运行。使用的MDCT是HiSpeed QX/i（R）（GE）。工作电压120 kV，电流100 mA，时间0.7 s，扫描长度77 mm。组织和器官吸收剂量的测量是用锡Alderson体模进行的，将辐射光致发光玻璃剂量计嵌入器官/组织中。将获得的值转换为吸收（损失）。结果：31）Accuitomo（R）在一次照射中器官的吸收剂量范围为1-5 mGy，比其它剂量低几倍至十倍。3D Accuitomo（R）的有效剂量范围为18 μ Sv至66 μ Sv，比其他器械小一个数量级。总之，这些结果表明31）Accuitomo（R）中的剂量低于CB MercuRay（R），远低于MDCT。
Objectives: Volumetric CT using a cone beam has been developed by several manufacturers for dentomaxillofacial imaging. The purpose of this study was to measure doses for implant planning with cone beam volumetric imaging (CBVI) in comparison with conventional multidetector CT (MDCT).Methods: The two CBVI systems Used were a 3D Accuitomo (R) (J. Morita), including an image-intensifier type (II) and a flat-panel type (FPD), and a CB MercuRay (R) (Hitachi). The 3D Accuitomo (R) operated at 80 kV, 5 mA and 18 s. The CB MercuRay (R) operated at 120 kV, 15 mA, 9.8 s. The MDCT used was a HiSpeed QX/i (R) (GE). operated at 120 kV, 100 mA and 0.7 s, and its scan length was 77 mm for both jaws. Measurement of the absorbed tissue and organ doses was performed with tin Alderson phantom, embedding the radiophotoluminescence glass dosemeter into the organs/tissues. The values obtained were converted into the absorbed (lose. The effective dose as defined by the International Commission on Radiological Protection was then calculated.Results: The absorbed doses of the 31) Accuitomo (R) of the organs in the primary beam ranged from 1-5 mGy, and were several to ten times lower than other (loses. The effective dose of the 3D Accuitomo (R) ranged from 18 mu Sv to 66 mu Sv, and was an order of magnitude smaller than the others. In conclusion, these results show that the dose in the 31) Accuitomo (R) is lower than the CB MercuRay (R) and much less than MDCT.