关键词: X射线成像, 图像质量评价, 递变能量成像, 线性散布度, 平均对比度

Abstract:

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 new standard.And it can avoid the limitation of the traditional single evaluation index.

Key words: X-ray imaging, image quality evaluation, varying energy imaging, linear dispersion, average contrast