【摘要】 首先推导了旋转中心到扇束中心射线移动距离为旋转角度的函数时的精确滤波及投影重构算法 ;然后推导了这个函数为线性函数时的重构算法 ;最后用计算机模拟法证明了两个算法的正确性更多还原

【Abstract】 Firstly the accurate filter back projection reconstruction algorithm is derived when the moving distance between the rotation centre and the central line of fan beam is the function of the rotation angle. Then the reconstruction algorithm is derived when this function is the linear one. Finally the correctness of these two algorithms are proved by the computer simulation.更多还原