引言随着电子学的发展,放射学科技术有了飞跃的发展,由新型的 X 线成象系统所获得的影象信息,为 X 线诊断和治疗提供了更为有力的依据。与此同时,也就对影象质量提出了更高的要求,因而 X 线成象原理及象质的客观评价就成了研究的重要课题。为此,六十年代初,国际放射界把通讯工程学、近代光学中光学传递函数(OTF)、调制传递 Introduction With the development of electronics, the radiological technology has made rapid progress. The image information obtained by the new X-ray imaging system provides a more powerful basis for X-ray diagnosis and treatment. At the same time, it also puts forward higher requirements on image quality. Therefore, the objective evaluation of X-ray imaging principle and image quality has become an important issue for research. To this end, the early 1960s, the international community to radio communications engineering, modern optical transfer function (OTF), modulation and transmission