A method for reconstructing a Computer Tomography (CT) image is disclosed. The method may comprise: obtaining a X-ray projection data frame and a dynamic sensor information data frame, wherein the X-ray projection data frame may include a first timestamp indicating acquisition time of X-ray projection data and the dynamic sensor information data frame may include a second timestamp indicating acquisition time of dynamic sensor information data extracting the first timestamp from the X-ray projection data frame and extracting the second timestamp from the dynamic sensor information data frame searching X-ray projection data and dynamic sensor information data which may be acquired in same sampling period according to a first timestamp and a second timestamp and reconstructing a CT image according to the searched X-ray projection data and dynamic sensor information data which may be acquired in the same sampling period.
