Fisher E, van der Stelt P F, Ostuni J, Dunn S M
Department of Oral Radiology, Academic Center for Dentistry, Amsterdam, The Netherlands.
Dentomaxillofac Radiol. 1995 Feb;24(1):5-12. doi: 10.1259/dmfr.24.1.8593908.
Digital alignment of dental X-ray images using projective invariants has been shown to be a feasible method for detecting changes through digital subtraction radiography. Previous research on the validity of the standardization procedure has considered the effects of motion of the X-ray source alone. Here the effects of independent motion of the film and the object on the standardization are investigated. This is accomplished by fitting a wire grid to the X-ray source, which allows for correction of film motion separately. The usefulness of separating the motion corrections is discussed, as well as some possible sources of error in the overall standardization procedure. The results of the standardization were found not to differ significantly whether the motions were corrected for separately or simultaneously.
利用射影不变量对牙科X射线图像进行数字对齐，已被证明是一种通过数字减影放射成像检测变化的可行方法。先前关于标准化程序有效性的研究仅考虑了X射线源运动的影响。本文研究了胶片和物体独立运动对标准化的影响。这是通过将金属丝网格安装到X射线源上来实现的，这样可以分别校正胶片运动。讨论了分离运动校正的有用性，以及整个标准化程序中一些可能的误差来源。结果发现，无论运动是分别校正还是同时校正，标准化结果都没有显著差异。
