Monzen Hajime, Tamura Mikoto, Shimomura Kohei, Onishi Yuichi, Nakayama Shinichi, Fujimoto Takahiro, Matsumoto Kenji, Hanaoka Kohei, Kamomae Takeshi
Department of Medical Physics, Graduate School of Medical Science, Kindai University, Osakasayama, 589-8511, Japan.
Clinical Radiology Service Division, Kindai University Hospital, Osakasayama, 589-8511, Japan.
J Appl Clin Med Phys. 2017 May;18(3):215-220. doi: 10.1002/acm2.12083. Epub 2017 Apr 19.
Tungsten functional paper (TFP), which contains 80% tungsten by weight, has radiation-shielding properties. We investigated the use of TFP for the protection of operators during interventional or therapeutic angiography. The air kerma rate of scattered radiation from a simulated patient was measured, with and without TFP, using a water-equivalent phantom and fixed C-arm fluoroscopy. Measurements were taken at the level of the operator's eye, chest, waist, and knee, with a variable number of TFP sheets used for shielding. A Monte Carlo simulation was also utilized to analyze the dose rate delivered with and without the TFP shielding. In cine mode, when the number of TFP sheets was varied through 1, 2, 3, 5, and 10, the respective reduction in the air kerma rate relative to no TFP shielding was as follows: at eye level, 24.9%, 29.9%, 41.6%, 50.4%, and 56.2%; at chest level, 25.3%, 33.1%, 34.9%, 46.1%, and 44.3%; at waist level, 45.1%, 57.0%, 64.4%, 70.7%, and 75.2%; and at knee level, 2.1%, 2.2%, 2.1%, 2.1%, and 2.1%. In fluoroscopy mode, the respective reduction in the air kerma rate relative to no TFP shielding was as follows: at eye level, 24.8%, 30.3%, 34.8%, 51.1%, and 58.5%; at chest level, 25.8%, 33.4%, 35.5%, 45.2%, and 44.4%; at waist level, 44.6%, 56.8%, 64.7%, 71.7%, and 77.2%; and at knee level, 2.2%, 0.0%, 2.2%, 2.8%, and 2.5%. The TFP paper exhibited good radiation-shielding properties against the scattered radiation encountered in clinical settings, and was shown to have potential application in decreasing the radiation exposure to the operator during interventional radiology.
钨功能纸（TFP）的重量含钨量为80%，具有辐射屏蔽特性。我们研究了在介入性或治疗性血管造影过程中使用TFP保护操作人员的情况。使用水等效体模和固定C形臂荧光透视设备，在有和没有TFP的情况下，测量了模拟患者散射辐射的空气比释动能率。在操作人员的眼睛、胸部、腰部和膝盖水平进行测量，使用不同数量的TFP片进行屏蔽。还利用蒙特卡罗模拟分析了有无TFP屏蔽时的剂量率。在电影模式下，当TFP片的数量分别为1、2、3、5和10片时，相对于无TFP屏蔽，空气比释动能率的相应降低情况如下：在眼睛水平，分别为24.9%、29.9%、41.6%、50.4%和56.2%；在胸部水平，分别为25.3%、33.1%、34.9%、46.1%和44.3%；在腰部水平，分别为45.1%、57.0%、64.4%、70.7%和75.2%；在膝盖水平，分别为2.1%、2.2%、2.1%、2.1%和2.1%。在荧光透视模式下，相对于无TFP屏蔽，空气比释动能率的相应降低情况如下：在眼睛水平，分别为24.8%、30.3%、34.8%、51.1%和58.5%；在胸部水平，分别为25.8%、33.4%、35.5%、45.2%和44.4%；在腰部水平，分别为44.6%、56.8%、64.7%、71.7%和77.2%；在膝盖水平，分别为2.2%、0.0%、2.2%、2.8%和2.5%。TFP纸对临床环境中遇到的散射辐射表现出良好的辐射屏蔽特性，并显示出在减少介入放射学过程中操作人员辐射暴露方面的潜在应用价值。
