Previtte R G
Radiol Technol. 1982 Mar-Apr;53(5):399-405.
In iodine contrast studies, an improvement in contrast is theoretically possible by narrowing the energy spectrum around the k-edge of iodine. Heavy metal filtration is a method of narrowing the energy spectrum but other parameters of the examination may be altered. These other parameters must be examined. After establishing the effect of heavy metal (erbium) filtration on the beam energy, the filter is evaluated in a simulated clinical situation. Patient exposure, image contrast, and tube loading are monitored while obtaining radiographs of a phantom comparable to a standard radiograph of the phantom. From this study, it was determined that erbium filtration could be used to decrease patient exposure markedly without significant loss of contrast or an increase in tube loading. Also determined was a set of exposure factors at which the erbium filtration was most effective.
在碘对比剂研究中，理论上通过使能量谱在碘的K边附近变窄，可提高对比度。重金属过滤是一种使能量谱变窄的方法，但检查的其他参数可能会改变。必须检查这些其他参数。在确定重金属（铒）过滤对束流能量的影响后，在模拟临床情况下对过滤器进行评估。在获取与体模标准射线照片相当的体模射线照片时，监测患者的辐射剂量、图像对比度和管负载。从这项研究中可以确定，铒过滤可用于显著降低患者的辐射剂量，而不会显著降低对比度或增加管负载。还确定了一组铒过滤最有效的曝光因素。
