Cho Jeong-Yeon, Han Won-Jeong
Department of Oral & Maxillofacial Radiology, Dankook University College of Dentistry, Cheonan, Korea.
Restor Dent Endod. 2012 Aug;37(3):160-4. doi: 10.5395/rde.2012.37.3.160. Epub 2012 Aug 29.
This study was aimed to investigate the methods to reduce operator's radiation dose when taking intraoral radiographs with portable dental X-ray machines.
Two kinds of portable dental X-ray machines (DX3000, Dexcowin and Rextar, Posdion) were used. Operator's radiation dose was measured with an 1,800 cc ionization chamber (RadCal Corp.) at the hand level of X-ray tubehead and at the operator's chest and waist levels with and without the backscatter shield. The operator's radiation dose at the hand level was measured with and without lead gloves and with long and short cones.
The backscatter shield reduced operator's radiation dose at the hand level of X-ray tubehead to 23 - 32%, the lead gloves to 26 - 31%, and long cone to 48 - 52%. And the backscatter shield reduced operator's radiation dose at the operator's chest and waist levels to 0.1 - 37%.
When portable dental X-ray systems are used, it is recommended to select X-ray machine attached with a backscatter shield and a long cone and to wear the lead gloves.
本研究旨在探讨使用便携式牙科X射线机进行口腔内X线摄影时降低操作人员辐射剂量的方法。
使用两种便携式牙科X射线机（DX3000，Dexcowin和Rextar，Posdion）。使用1800cc电离室（RadCal公司）在X射线管头的手部水平以及操作人员的胸部和腰部水平测量操作人员的辐射剂量，测量时有无反向散射防护屏。在有无铅手套以及使用长锥形和短锥形X射线管的情况下，测量操作人员手部水平的辐射剂量。
反向散射防护屏将操作人员在X射线管头手部水平的辐射剂量降低至23% - 32%，铅手套降低至26% - 31%，长锥形X射线管降低至48% - 52%。反向散射防护屏将操作人员胸部和腰部水平的辐射剂量降低至0.1% - 37%。
使用便携式牙科X射线系统时，建议选择配备反向散射防护屏和长锥形X射线管的X射线机，并佩戴铅手套。
