A METHOD FOR COMPARING BEAM-HARDENING FILTER MATERIALS FOR DIAGNOSTIC-RADIOLOGY
A METHOD FOR COMPARING BEAM-HARDENING FILTER MATERIALS FOR DIAGNOSTIC-RADIOLOGY
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DOI：
10.1118/1.596210
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发表时间：
1988-07-01
期刊：
影响因子：
3.8
通讯作者：
JENNINGS, RJ
中科院分区：
文献类型：
--
作者：
JENNINGS, RJ
在诊断放射学中使用适当射束过滤的必要性是众所周知的。虽然铝是诊断X射线应用中最广泛使用的过滤材料，但其他材料可能具有上级性能的可能性促使了许多研究，这些研究试图确定最适合给定情况的过滤类型和数量。本文介绍了一种基于精确匹配的光谱形状，允许绝对排名的射束硬化材料的方法。光谱形状的匹配确保了图像对比度和患者剂量等参数的相等性。光谱等效滤波器然后可以基于一个相对于另一个的透射率来排名。根据该方法背后的理论和实现该方法的算法的发展，该方法被应用于评估在诊断放射学中用作过滤器的各种材料。一些计算结果的实验验证也进行了说明。计算和实验结果都表明，普通铝过滤器的效率比铜、黄铜或铁等材料的过滤器低约10%。由于这里遵循的方法是几个早期研究的基础上过滤的orthovoltage治疗，一个简短的比较结果，从这些早期的报告与使用这里开发的方法计算的结果。
The necessity for using adequate beam filtration in diagnostic radiology is well known. Although aluminum is the most widely used filter material for diagnostic X-ray applications, the possibility that other materials might have superior properties has prompted a number of studies that have attempted to determine both the type and the amount of filtration most appropriate for a given situation. This paper describes a method based on precise matching of spectral shape that permits the absolute ranking of beam-hardening materials. Matching of spectral shape ensures equality of such parameters as image contrast and patient dose. Spectrally equivalent filters can then be ranked on the basis of the transmission of one relative to another. Following the development of the theory behind the method and an algorithm for implementing it, the method is applied to the evaluation of a variety of materials for use as filters in diagnostic radiology. Experimental verification of a few of the calculated results is also described. Both calculated and experimental results show that normal aluminum filters are about 10% less efficient than filters of materials such as copper, brass, or iron. Since the approach followed here was the basis for several early investigations of filtration for orthovoltage therapy, a brief comparison of results from these early reports with results calculated using the method developed here is also presented.