| 罗葳,赵越,王建超.对一种口腔锥形束CT的有效剂量的估算[J].中华放射医学与防护杂志,2017,37(3):222-225 |
| 对一种口腔锥形束CT的有效剂量的估算 |
| Eatimation of effective doses from a dental cone beam computed tomographic scanner |
| 投稿时间：2016-06-22 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.03.012 |
| 中文关键词: 锥形束计算机体层摄影 剂量面积乘积 有效剂量 转换系数 |
| 英文关键词:Cone beam computed tomography(CBCT) Dose-area product(DAP) Effective dose Conversion coefficient |
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| 中文摘要: |
| 目的 从测量一种口腔锥形束CT （CBCT）扫描机的剂量面积乘积（DAP），使用一个转换系数估算有效剂量。方法 使用DAP测量方法对一台柯达（KODAK）9500扫描机使用2个视野：16 cm×15 cm和12 cm×8 cm。将一台瑞典RTI产DAP （Doseguard 100）仪器配套透射电离室贴在机器X射线管出线口处测量每种曝光方案的DAP值（mGy·cm2），所有测量重复3次取平均。引用文献中一个转换系数为0.080 μSv/mGy·cm2对柯达扫描机，每一个平均DAP值估算有效剂量。结果 对于KODAK 9500机器在2个视野的DAP值变化范围从512到1 083 mGy·cm2和用0.080 μSv/mGy·cm2估算有效剂量从41到87 μSv。发现与文献中3台KODAK9500机器有效剂量相比，本研究得到的有效剂量明显偏低。结论 发现对口腔CBCT扫描机进行DAP测量是一种很好定义和快捷测量的方法，通过选择一个适当转换系数可以估算有效剂量。然而，对不同类型口腔CBCT机器如何适当地选用转换系数，需要进一步加以细致地研究。 |
| 英文摘要: |
| Objective To calculate effective dose based on the dose-area Product (DAP) measured in dental cone beam computed tomograhic (CBCT) scanning and using a conversion coefficient. Methods The method of the DAP was used to calculate the effective dose from KODAK 9500 dental CBCT scanner with fields of view (FOV) of 16 cm×15 cm and 12 cm×8 cm. The DAP-values (mGy·cm2) were measured using a transmission ionization chamber connected to an electrometer (Doseguard 100, RTI Electronics AB, Sweden) and the chamber was placed directly on the exit of the X-ray tube. All measurements were repeated three times and averaged on each FOV data. The conversion coefficient of 0.080 μSv/mGy·cm2 was used to estimate the effective dose on the basis of DAP values, which was quoted from a literature. Results DAP values were found between the two FAOs to vary from 512 to 1 083 mGy·cm2, and the effective doses calculated with 0.080 μSv/mGy·cm2 were 41 to 87 μSv. The effective doses given in this paper was lower than those reported in other literatures. Conclusions DAP measurement was found to be well defined and easy-to-use method of determining effective dose for some CBCT Units. However, determination of specific conversion coefficient in the CBCT must be further developed. |
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