Medical Physics Department, Hospital Clínico San Carlos, Madrid, Spain.
Cardiovasc Intervent Radiol. 2010 Dec;33(6):1210-4. doi: 10.1007/s00270-010-9945-4. Epub 2010 Aug 6.
The evaluation of a new occupational Dose Aware System (DAS) showing staff radiation doses in real time has been carried out in several angiography rooms in our hospital. The system uses electronic solid-state detectors with high-capacity memory storage. Every second, it archives the dose and dose rate measured and is wirelessly linked to a base-station screen mounted close to the diagnostic monitors. An easy transfer of the values to a data sheet permits further analysis of the scatter dose profile measured during the procedure, compares it with patient doses, and seeks to find the most effective actions to reduce operator exposure to radiation.
The cumulative occupational doses measured per procedure (shoulder-over lead apron) ranged from 0.6 to 350 μSv when the ceiling-suspended screen was used, and DSA (Digital Subtraction Acquisition) runs were acquired while the personnel left the angiography room. When the suspended screen was not used and radiologists remained inside the angiography room during DSA acquisitions, the dose rates registered at the operator's position reached up to 1-5 mSv/h during fluoroscopy and 12-235 mSv/h during DSA acquisitions. In such case, the cumulative scatter dose could be more than 3 mSv per procedure.
Real-time display of doses to staff members warns interventionists whenever the scatter dose rates are too high or the radiation protection tools are not being properly used, providing an opportunity to improve personal protection accordingly.
在我院的几个血管造影室中，对新的职业剂量感知系统（DAS）进行了评估，该系统实时显示工作人员的辐射剂量。该系统使用带有大容量存储的电子固态探测器。它每秒都会记录测量的剂量和剂量率，并通过无线方式与安装在诊断监视器附近的基站屏幕连接。将数值轻松转移到数据表中，允许进一步分析程序中测量的散射剂量分布，将其与患者剂量进行比较，并寻求最有效的措施来降低操作人员的辐射暴露。
当使用天花板悬挂屏幕时，每次手术（肩部超过铅围裙）的累积职业剂量范围为 0.6 至 350 μSv，并且在人员离开血管造影室时进行 DSA（数字减影采集）运行。当不使用悬挂屏幕并且放射科医生在 DSA 采集期间留在血管造影室内时，操作人员位置的剂量率在透视期间达到 1-5 mSv/h，在 DSA 采集期间达到 12-235 mSv/h。在这种情况下，每次手术的散射剂量累积量可能超过 3 mSv。
向工作人员实时显示剂量，每当散射剂量率过高或未正确使用辐射防护工具时，都会提醒介入治疗师，从而有机会相应地改善个人防护。
