摘要
在对有关减影技术及成像过程中各种可能对图像质量产生影响因素分析的基础上 ,设计了微机化的数字减影血管造影系统 .设计了包括视频匹配放大器、数字量输入输出接口板等硬件电路 ,将来自 X光设备输出的视频信号 ,经 A/ D转换、量化 ,通过 PCL 总线移入计算机的内存 ,转换成可为计算机直接处理的数字信号 .在研究中 ,利用直方图均衡、灰度的线性和对数拉伸、模糊增强及数学形态学滤波、递推滤波技术等处理 ,较大程度上提高了影象对比度 ,提高了图像信号的信噪比 ,增强了感兴趣区信号 。
Based on the analysis of subtraction technique and factors possibly influencing image quality in imaging processing.a micro computerized system of digital subtraction angiography(DSA) was designed.Some hardware circuits,such as video matching amplifiers,digital I/O interface plate ,were also designed.The video signal from the television camera was directly collected,and then A/D transformed and quantified to be transfer red to comprter memory through PCI,by which,the signals were digitized for computer processing. The techniques including histogram equilibrium,linear expansion and logarithmic expansion of gray scale,fuzzy enhancement,mathematical morphology filtering,recursive filtering,were used to improve the contrast of the image;was effectively increased the SNR of image the SNR of the image was effectively increased and ethe effect of moise was suppressed.the effect of noise and was suppressde.The signals of interest were intensified,and the influence of backgriund noise as well as the areas of non interest were decreased.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2002年第1期120-125,共6页
Journal of Tianjin University：Science and Technology
基金
天津市自然科学基金项目资助 (97361 0 4 1 1 )
