Williamson B D, van Doorn T
National Radiation Laboratory, New Zealand.
Australas Phys Eng Sci Med. 1994 Dec;17(4):162-74.
The application of K-edge filters in diagnostic radiology has been investigated by many workers for over twenty years. These investigations have analysed the effects of such filters on image quality and radiation dose as well as the practicalities of their application. This paper presents a synopsis of the published works and concludes that K-edge filters do not perceptibly improve image quality and make only limited reductions in patient dose. K-edge filters are also costly to purchase and potentially result in a reduction in the cost effectiveness of x-ray examinations by increasing the x-ray tube loading. Equivalent contrast enhancement and dose reductions can be achieved by the assiduous choice of non-selective filters.
二十多年来，许多研究人员一直在研究K边滤波器在诊断放射学中的应用。这些研究分析了此类滤波器对图像质量和辐射剂量的影响及其应用的实用性。本文概述了已发表的研究成果，并得出结论：K边滤波器并不能显著提高图像质量，仅能有限地降低患者剂量。K边滤波器的购置成本也很高，而且可能会因增加X射线管负荷而降低X射线检查的成本效益。通过精心选择非选择性滤波器，可以实现等效的对比度增强和剂量降低。
