Method and device for reconstructing CT image and storage medium

A device for reconstructing a Computed Tomography (CT) image, comprising:

• a CT scanning apparatus configured to perform CT scanning on an object to be inspected to obtain projection data;
• a processor configured to:
• generate projection data on a plurality of other scales from the projection data on the first scale;
• process, on each scale, projection data on the corresponding scale by using a first convolutional neural network to obtain processed projection data, and perform a back-projection operation on the processed projection data to obtain a CT image on the corresponding scale;
• and
• fuse CT images on the plurality of scales to obtain a reconstructed image of the object to be inspected.

A non-transitory computer-readable medium having computer programs stored thereon, which when being executed by a processor, cause the processor to perform the following steps:

• generating projection data on a plurality of other scales from projection data on a first scale;
• processing, on each scale, projection data on the corresponding scale by using a first convolutional neural network to obtain processed projection data, and performing a back-projection operation on the processed projection data to obtain a CT image on the corresponding scale;
• and
• fusing CT images on the plurality of scales to obtain a reconstructed image of the object to be inspected.