医用诊断X射线数字图像评价模体与轮廓提取研究

Research on phantom and contour extraction in medical diagnostic X-ray digital image evaluation

为保障X射线数字成像系统的图像质量,科学地分析评价数字图像的低对比度和细节,对比分析常见医用诊断X射线数字图像评价模体的材料和对比度目标参数。采用阈值和八向链码提取分析目标的轮廓,并将轮廓提取算法设计成计算机图像分析软件,用于分析模体成像实例。分析结果表明图像二值化阈值的选取和目标尺寸大小对轮廓分析具有较大影响,科学地选择阈值,采用统一的计算机程序分析图像低对比度,可以减少人工分析的主观性差异,为科学客观的分析评价数字成像效果提供参考。

In order to guarantee the image quality of X-ray digital radiography system,and scientifically analyze and evaluate the low contrast and detail of digital image.The material and parameter of the general imaging phantom are compared and analyzed.Image threshold and eight-neighborhood chain code are applied to the analysis of the target contour extraction algorithm for software program design.A real phantom is analyzed by this program.The analysis results show that the selection of image binarization threshold and the size of target have great influence on contour analysis.Scientifically selecting the threshold and adopting unified computer program to analyze the low contrast of images can reduce the subjectivity of manual analysis and provides reference for scientific and objective analysis and evaluation of digital imaging effect.