Methods, systems, and storage mediums for image generation

A system for image generation, implemented on a computing device having one or more processors and one or more storage devices, the system comprising:

• at least one storage device including a set of instructions;
• and
• at least one processor configured to communicate with the at least one storage device, wherein when executing the set of instructions, the at least one processor is configured to direct the system to perform operations including:
• obtaining a three-dimensional (3D) base image of a target subject, the 3D base image being captured by performing a 3D scan on the target subject with a preset posture;
• obtaining one or more two-dimensional (2D) scout images of the target subject, the one or more 2D scout images of the target subject being captured by performing a scout scan on the target subject with the preset posture after an internal structure of the target subject changes;
• generating a 3D predicted image of the subject based on the 3D base image and the one or more 2D scout images, the 3D predicted image indicating the internal structure of the target subject when the one or more 2D scout images are captured.