目的研究计算机图像数字减影技术对常规牙齿X线片的诊断作用。
Objective To investigate a digital substraction technique with computer image processing for diagnosis on dental X ray films.
由于X线成像过程的复杂性和非线性，普通的减影方法并不能完全消除与血管重叠的其它组织的影像。
Because of the complexity and non_linearity of the X_ray imaging process, the common DSA technique cannot completely remove other tissue's image which lapped over the vessels.
每一种生活的元素都清晰地印刻在生活几何的舒适情调里，正如天空中渐行渐远的影线，不经意间装饰着大地的风景。
Each kind of elements of life all print in the comfortable sentimental appeal of life? G, like the long lines in the air which is decorating the scene of the earth freely.
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