Department of Radiology, Division of Neuroradiology, Vascular and Interventional Radiology, Medical University Graz, Auenbruggerpatz 9, 8036, Graz, Austria.
Department of Medical Physics and Radiation Protection, Medical University Graz, Auenbruggerpatz 9, 8036, Graz, Austria.
Eur Radiol. 2022 Mar;32(3):1688-1696. doi: 10.1007/s00330-021-08231-y. Epub 2021 Sep 8.
By simulating a fluoroscopic-guided vascular intervention, two differently designed radiation safety glasses were compared. The impacts of changing viewing directions and body heights on the eye lens dose were evaluated. Additionally, the effect of variable magnification levels on the arising scattered radiation was determined.
A phantom head, replacing the operator's head, was positioned at different heights and rotated in steps of 20° in the horizontal plane. Thermoluminescent dosimeters (TLD), placed in the left orbit of the phantom, detected eye lens doses under protected and completely exposed conditions. In a second step, radiation dose values with increasing magnification levels were detected by RaySafe i3 dosimeters.
Changing eye levels and head rotations resulted in a wide range of dose reduction factors (DRF) from 1.1 to 8.5. Increasing the vertical distance between the scattering body and the protective eyewear, DRFs markedly decreased for both glasses. Significant differences between protection glasses were observed. Increasing magnification with consecutively decreasing FOV size variably reduced the dose exposure to the eye lens between 47 and 83%, respectively.
The safety glasses in the study effectively reduced the dose exposure to the eye lens. However, the extent of the protective effect was significant depending on eye levels and head rotations. This may lead to a false sense of safety for the medical staff. In addition, the application of magnification reduced the quantity of scattering dose significantly. To ensure safe working in the Cath-lab, additional use of protective equipment and the differences in design of protective eyewear should be considered.
• Eye lens dose changes with physical size of the interventionist and viewing direction. • The use of magnification during fluoroscopic-guided interventions reduces scattered radiation.
通过模拟荧光透视引导的血管介入，比较了两种不同设计的辐射安全眼镜。评估了改变观察方向和身体高度对晶状体剂量的影响。此外，还确定了可变放大倍数对散射辐射的影响。
用一个代替操作者头部的头颅模型，以不同的高度定位，并在水平面上以 20°的步长旋转。在有保护和完全暴露的条件下，放置在头颅模型左眼眶中的热释光剂量计（TLD）检测晶状体剂量。在第二步中，使用 RaySafe i3 剂量计检测随着放大倍数增加的辐射剂量值。
改变眼睛高度和头部旋转导致剂量减少因子（DRF）从 1.1 到 8.5 变化范围很广。对于两种眼镜，散射体和防护眼镜之间的垂直距离增加，DRF 显著降低。观察到保护眼镜之间存在显著差异。随着视野尺寸的连续减小，放大倍数的增加分别使晶状体的剂量暴露减少了 47%至 83%。
研究中的安全眼镜有效地降低了晶状体的剂量暴露。然而，保护效果的程度取决于眼睛高度和头部旋转，这可能会使医务人员产生错误的安全感。此外，放大倍数的应用显著减少了散射剂量。为了确保在 Cath-lab 中安全工作，应考虑额外使用防护设备和防护眼镜的设计差异。
晶状体剂量随介入医师的体格大小和观察方向而变化。
荧光透视引导介入时使用放大倍数可减少散射辐射。
