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为实现窄角扇束扫描方式下的CT图像重建,结合窄角扇束扫描方式的特点,对已有的重排算法进行了改进,加入了数据对齐环节,实现了窄角扇束扫描投影数据的同步性。为验证改进的重排算法的有效性,利用窄角扇束工业CT对某型固体火箭发动机进行CT检测,并分别用改进前后的重排算法对获得的投影数据进行重建。结果表明,改进后的重排算法重建的图像能够很好地反映固体火箭发动机的内部结构,对固体火箭发动机的无损探伤和寿命预估具有重要意义。
In order to realize the reconstruction of CT images in narrow-angle fan beam scanning mode, the existing rearrangement algorithm is improved by combining the features of narrow-angle fan beam scanning mode, and the data alignment is added to realize the narrow-angle fan beam scanning projection data Synchronization. In order to verify the effectiveness of the improved rearrangement algorithm, a narrow-angle fan beam industrial CT was used to detect the CT of a certain type of solid rocket motor. The obtained projection data were reconstructed with the improved rearrangement algorithm. The results show that the improved reconstruction algorithm can reflect the internal structure of the solid rocket engine well, and is of great significance to the nondestructive testing and lifetime estimation of the solid rocket motor.