中文摘要：

X射线图像质量评价是射线检测正确与否的关键问题,传统的人工主观评价方法效率低,实时性差,常用的对比度、清晰度等考核指标,受成像过程的散射及噪声影响,存在一定的局限性.为此论文提出基于递变能量线性约束的X射线图像质量评价方法.文章首先通过分析递变能量成像过程中图像序列的灰度变化规律,提出序列间灰度增益分布图,并依据成像器件的线性最优成像,从分布图中提取线性散布度评价图像质量;进一步针对过曝光影响散布度评价失败问题,综合线性散布度和平均对比度,构建了新的图像质量综合评价标准,实现射线图像质量评价.最后通过实验验证了论文方法的可行性,能够有效避免传统单一评价指标的局限性.

英文摘要：

X-ray image quality evaluation is the key problem of ray detection accuracy. The efficiency and real-time of the traditional subjective assessment method is poor. Also for some objective assessment indexes,such as contrast,definition,and so on,they have a certain limitation because of scatter and noise in the X-ray imaging. So this paper provides the method of X-ray image quality evaluation based on linear constraint with variable energy. First,based on the gray trend between the ray image sequences with variable energy imaging,the concept of the gray gain histogram between sequences is provided. Then based on the linear optimal imaging about imaging detector,evaluate image quality by the linear dispersion.Further,for the failure of dispersion evaluation because of over-exposure,synthesizing the linear dispersion and average contrast,the paper builds a standard of ray image quality evaluation. At last,the experiment proves the feasibility about this newstandard. And it can avoid the limitation of the traditional single evaluation index.