Qiang Wang, Qiang Fu, Lin Lin
Changzhou CDC, No. 203, Taishan Road, Changzhou, Jiangsu, China.
Radiat Prot Dosimetry. 2019 Jun 1;183(4):417-421. doi: 10.1093/rpd/ncy159.
This study aims to estimate the effective doses of dental X-ray devices under common scanning protocols. After putting TLDs in the Alderson Radiation Therapy Phantom, we exposed the phantom under common scanning protocols of three dental X-ray devices, namely CBCT, dental panoramic machine and intraoral round cone device. Then effective doses were calculated using the measured absorbed doses of organs and tissues. Tissue weighting factors recommended by the ICRP were adopted in the calculation. Effective doses under common scanning protocols of three Dental X-ray devices were obtained. The effective dose of dental CT was 0.20 mSv, and that of dental panoramic machine and intraoral radiography were 0.013 and 0.0050 mSv, respectively. The tissue absorbed doses of dental CT scan were 0.63 mGy of brain, 7.7 mGy of salivary glands, 8.7 mGy of thyroid and 4.0 mGy of the lens of the eye. The tissue absorbed doses from dental panoramic machine are 0.62 mGy of salivary glands and 0.25 mGy of thyroid. And finally the tissue absorbed dose of intraoral radiography was 0.80 mGy of salivary gland. Among the three dental X-ray devices studied, dental CBCT scan can cause much higher effective dose than the other two. Brain, salivary glands, thyroid and the lens of the eye are tissues receiving relatively higher absorbed doses.
本研究旨在估算常见扫描协议下牙科X射线设备的有效剂量。将热释光剂量计（TLDs）置于阿尔德森放射治疗体模中后，我们在三种牙科X射线设备（即锥形束计算机断层扫描（CBCT）、牙科全景机和口腔内圆锥束设备）的常见扫描协议下对体模进行了照射。然后，根据所测量的器官和组织吸收剂量计算有效剂量。计算中采用了国际辐射防护委员会（ICRP）推荐的组织权重因子。得出了三种牙科X射线设备常见扫描协议下的有效剂量。牙科CT的有效剂量为0.20毫希沃特（mSv），牙科全景机和口腔内摄影的有效剂量分别为0.013 mSv和0.0050 mSv。牙科CT扫描的组织吸收剂量为：脑0.63毫戈瑞（mGy）、唾液腺7.7 mGy、甲状腺8.7 mGy、眼晶状体4.0 mGy。牙科全景机的组织吸收剂量为：唾液腺0.62 mGy、甲状腺0.25 mGy。最后，口腔内摄影的组织吸收剂量为唾液腺0.80 mGy。在所研究的三种牙科X射线设备中，牙科CBCT扫描所产生的有效剂量远高于其他两种设备。脑、唾液腺、甲状腺和眼晶状体是吸收剂量相对较高的组织。
