Imaging method for static CT apparatus, static CT apparatus, electronic device, and medium

An imaging method for a static CT apparatus, wherein the static CT apparatus comprises a distributed ray source and a detector, the distributed ray source comprises a plurality of ray source points configured to emit rays towards an inspected object, and the detector comprises a plurality of detector units configured to detect the rays passing through the inspected object,

• wherein the imaging method comprises:
• an initial projection data acquisition step of acquiring initial projection data of the inspected object at different angles by using the distributed ray source and the detector, wherein the initial projection data comprises projection data that is directly obtained by the detector based on the rays emitted from the plurality of ray source points;
• a first image reconstruction step of obtaining a first CT image using a reconstruction algorithm according to the acquired initial projection data;
• an image segmentation step of dividing the first CT image into N first sub-images, where N is a positive integer greater than or equal to 1, and a union of the N first sub-images covers the entire first CT image;
• a first optimization step of optimizing the N first sub-images to obtain N second sub-images;
• and
• an image merging step of merging the N second sub-images to obtain a second CT image,
• wherein the plurality of ray source points comprise a first-type ray source point and a second-type ray source point, and the first-type ray source point is at least one of the plurality of ray source points;
• wherein the initial projection data comprises first projection data and second projection data, the first projection data is projection data directly obtained based on a ray emitted from the first-type ray source point, and the second projection data is projection data directly obtained based on a ray emitted from the second-type ray source point;
• and
• wherein the N first sub-images are optimized with the first projection data as an optimization objective in a process of optimizing the N first sub-images.