Mesbahi Asghar, Rouhani Alireza
Medical Physics Department, Medical School, Tabriz University of Medical Sciences, Tabriz, Iran.
Radiat Prot Dosimetry. 2008;132(1):98-101. doi: 10.1093/rpd/ncn227. Epub 2008 Sep 2.
In this study, radiation exposure to the surgeon and supporting staff from a mini C-arm unit during fluoroscopically guided orthopaedic surgeries was studied. A Diadose dosemeter and Gamma-Scout meter were used for air-kerma measurements for primary and scattered radiations. The entrance dose of hands, eyes and thyroid of the surgeon was measured during direct observation. Scattered air-kerma rate was measured to quantify the received entrance dose of the supporting staff. During direct observation, the skin-entrance exposure rates of the surgeon's hand, eye and thyroid gland were 8036, 0.85 and 0.9 microGy min(-1), respectively. The scattered exposure rate was precipitously dropped beyond the path of the primary radiation beam, and reached 0.51 microGy min(-1) at a distance of 40 cm from the beam's central axis. This study showed that the surgeon's hand was the most dose-limiting organ for fluoroscopically guided orthopaedic surgery procedures when it was exposed to primary radiation. The exposure of supporting staff at a working distance of >20 cm from the beam was minimal during fluoroscopy by mini C-arm unit.
在本研究中，对小型C形臂装置在透视引导下的骨科手术过程中对外科医生和辅助人员的辐射暴露情况进行了研究。使用双剂量剂量仪和伽马 Scout 仪对原发射线和散射射线进行空气比释动能测量。在直接观察期间测量了外科医生手部、眼睛和甲状腺的入射剂量。测量了散射空气比释动能率，以量化辅助人员所接受的入射剂量。在直接观察期间，外科医生手部、眼睛和甲状腺的皮肤入射暴露率分别为8036、0.85和0.9微戈瑞每分钟（-1）。散射暴露率在原发射线束路径之外急剧下降，在距线束中心轴40厘米处达到0.51微戈瑞每分钟（-1）。本研究表明，在透视引导下的骨科手术过程中，当外科医生的手部暴露于原发射线时，是最受剂量限制的器官。在小型C形臂装置进行透视检查期间，距离线束>20厘米工作距离的辅助人员的暴露极小。
