微焦点X射线成像系统扫描参数测量rn及投影图像校正研究

摘要

微焦点X射线成像系统由于被重新安装以及初始化,导致系统参数读数与实际值之间存在偏量。给出了测量这些偏量值的基本原理和方法,并通过实验求出偏量值。由于图像增强器与图像获取装置本身固有特点以及非线性获取成像,投影图像存在几何畸变。讨论了图像几何畸变校正的基本原理,并给出具体步骤以及校正后的图像。%Because of the reinstalling of microfocus X-ray imaging system there will be certain deviation the inherent characteristics of the image intensifier and the image-acquisition device, the acquired projected image is geometrical distorted, this debases the accuracy of the reconstructed image in three-dimensional CT. The current paper dicusses the basic principle of how to solve the precise measurement and calculation of FOD, FDD, and the correction of the geometrical distortion of the projected image.