CT imaging method of multitime scanning mode

The invention relates to a CT imaging method which is based on multiple scanning and used for CT imaging, namely, super-visual field CT imaging, when the scanning visual field of CT equipment can not cover an object to be detected. The method comprises the following steps: a projection data set is obtained by multiple scanning and collection and the CT image of the object to be scanned is obtained by that a scanning reconstruction algorithm is operated to process the projection data set. The invention is characterized in that when the object to be detected is scanned, the area covered by eachscanning is allowed to have overlapped parts and the scanning reconstruction algorithm used for processing the projection data set does not need to rearrange the data. The invention has the main advantages that the size of the object to be detected is not limited by the CT scanning visual field, the scanning mode is flexible; as the reconstruction algorithm does not need to rearrange the data, interpolation calculation needed by the rearrangement and the degrading of the reconstructed image caused by the rearrangement are avoided, therefore, the reconstruction speed is fast and the resolutionof the reconstructed image is high.