National Institute of Technology, Raipur, India.
Atomic Energy Regulatory Board, Mumbai, India.
Luminescence. 2019 Jun;34(4):444-449. doi: 10.1002/bio.3637. Epub 2019 Apr 26.
Dental orthopantogram (OPG)/cone beam computed tomography (CBCT) scanners are gaining popularity due to their 3D imaging with multiplanar view that provides clinical benefits over conventional dental radiography systems. Dental OPG/CBCT provides optimal visualization of adjacent overlaying anatomical structures that will be superpositioned in any single projection. The characteristics of indigenously developed optically stimulated luminescence dosimeters, namely, aluminium oxide doped with carbon (Al O :C), lithium magnesium phosphate doped with terbium and boron (LiMgPO :Tb,B) and lithium calcium aluminium fluoride doped with europium and yttrium (LiCaAlF :Eu,Y) were evaluated for their use in dental dosimetry. The dose-response of these dosimeters was studied at X-ray energies 60 kV, 70 kV and 81 kV. Radiation doses were also measured using Gafchromic film for comparison. Radiation dose was measured at eight different locations of a polymethyl methacrylate (PMMA) head phantom including eyes. The optically stimulated luminescence (OSL) sensitivity of LiMgPO :Tb,B is about 1.5 times and LiCaAlF :Eu, is about 20 times higher than the sensitivity of Al O :C. It was found that measured radiation doses by the three optically stimulated luminescence dosimeters (OSLDs) and Gafchromic film in the occipital region (back side) of a PMMA phantom, were consistent but variations in dose at other locations were significantly higher. The three OSLDs used in this study were found to be suitable for radiation dose measurement in dental units.
口腔全景/锥形束计算机断层扫描（CBCT）扫描仪因其具有 3D 成像和多平面视图的功能而越来越受欢迎，这为临床提供了优于传统牙科射线照相系统的优势。口腔全景/CBCT 提供了最佳的毗邻重叠解剖结构可视化效果，这些结构在任何单一投影中都会重叠。国产的光激励发光剂量计（OSLD）的特性，即掺碳的氧化铝（Al O :C）、掺铽和硼的磷酸锂镁（LiMgPO :Tb,B）以及掺铕和钇的氟化锂钙铝（LiCaAlF :Eu,Y），已被评估用于牙科剂量测定。在 X 射线能量 60kV、70kV 和 81kV 下研究了这些剂量计的剂量响应。还使用 Gafchromic 胶片进行了比较测量。在包括眼睛在内的 PMMA 头部体模的八个不同位置测量了辐射剂量。LiMgPO :Tb,B 的光激励发光（OSL）灵敏度约为 Al O :C 的 1.5 倍，而 LiCaAlF :Eu,Y 的灵敏度约为 Al O :C 的 20 倍。研究发现，三种 OSLD 和 Gafchromic 胶片在 PMMA 体模的枕部（背面）测量的辐射剂量是一致的，但其他位置的剂量变化明显更高。研究中使用的三种 OSLD 被发现适用于牙科单位的辐射剂量测量。
