口腔内放射摄影的环境剂量：第 3 部分：管电压的影响。
Ambient dose during intraoral radiography with current techniques: part 3: effect of tube voltage.
机构信息
Department of Oral Radiology, Academic Center for Dentistry Amsterdam, Amsterdam, The Netherlands.
出版信息
Dentomaxillofac Radiol. 2021 May 1;50(4):20190362. doi: 10.1259/dmfr.20190362. Epub 2021 Mar 8.
OBJECTIVES
This study was conducted to assess the impact of tube voltage on ambient dose during intraoral radiography, specifically remnant-beam transmission and scattered radiation.
METHODS AND MATERIALS
Remnant-beam and scattered radiation doses were recorded using a phantom at tube voltages of 60, 63, 66 and 70 kV. Mathematical equations depicting their relations were then formulated, and reference values were calculated at the various voltages tested. Total ambient doses per exposure at 60 kV and at 70 kV were compared.
RESULTS
Both remnant-beam transmission and scattered radiation increased ~40% by increasing tube voltage from 60 kV to 70 kV, and the relation was linear. A remnant beam transmission reference value of 7.5% was established at 70 kV, as well as a conversion factor of 0.035 µSv/mAs at 1 m for scattered radiation at 60 kV. Given longer exposure times at 60 kV, total ambient dose proved higher at 60 kV than at 70 kV.
CONCLUSION
Higher tube voltage results in higher remnant-beam transmission and more scattered radiation per workload. The relation is linear in the range between 60kV and 70 kV. Remnant-beam transmission at 70 kV is safely assessed at 7.5%. A conversion factor at 60 kV of 0.035 µSv/mAs at 1 m for the scattered radiation dose can be proposed. Total ambient dose per exposure was higher at 60kV than at 70 kV.
目的
本研究旨在评估管电压对口腔内放射摄影中环境剂量的影响，特别是残余射线透射和散射线。
方法与材料
使用体模记录管电压为 60、63、66 和 70 kV 时的残余射线透射和散射线剂量。然后制定了描述它们关系的数学方程，并计算了在不同测试电压下的参考值。比较了 60 kV 和 70 kV 每次照射的总环境剂量。
结果
管电压从 60 kV 增加到 70 kV 时，残余射线透射和散射线分别增加了约 40%，其关系呈线性。在 70 kV 时确定了 7.5%的残余射线透射参考值，以及在 60 kV 时 1 m 处散射线的 0.035 µSv/mAs 的转换系数。由于 60 kV 时的曝光时间较长，因此总环境剂量证明 60 kV 时高于 70 kV。
结论
更高的管电压导致每次工作量的残余射线透射和散射线更多。在 60kV 和 70 kV 之间，这种关系呈线性。70 kV 时的残余射线透射安全评估为 7.5%。可以提出 60 kV 时 1 m 处散射线剂量的 0.035 µSv/mAs 的转换系数。每次照射的总环境剂量在 60 kV 时高于 70 kV。
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