Reconstruction device, X-ray CT apparatus, and image processing device

An X-ray CT apparatus, comprising:

• a reconstruction device including a processing circuit configured to
• acquire a plurality of pieces of second sinogram data based on a plurality of pieces of first sinogram data,
• acquire third sinogram data by comparing the pieces of first sinogram data with the pieces of second sinogram data and by selecting pieces of first sinogram data, and
• reconstruct and display an image based on the third sinogram data,
• the X-ray CT apparatus being configured to generate the first sinogram data by performing an X-ray CT scan, wherein
• the processing circuit is further configured to
• calculate a degree of similarity between the pieces of first sinogram data and the pieces of second sinogram data,
• extract a region in the first sinogram data, for each of a plurality of regions in the pieces of second sinogram data:
• generate the third sinogram data by merging a result of the extraction;
• and
• generate the image based on the generated third sinogram data, and
• the processing circuit is further configured to generate the pieces of first sinogram data by performing registration processing on a plurality of CT images and then performing forward projection on each of the CT images after the registration processing, wherein the CT images are CT images of mutually different heartbeats in a same time phase, and the plurality of pieces of first sinogram data are sinogram data of mutually different heartbeats in a same time phase.

An image processing device, comprising:

• a reconstruction device including a processing circuit configured to
• acquire a plurality of pieces of second sinogram data based on a plurality of pieces of first sinogram data by removing an artifact or noise,
• acquire third sinogram data by comparing the pieces of first sinogram data with the pieces of second sinogram data and by selecting pieces of first sinogram, and
• reconstruct and display an image based on the third sinogram data,
• the image processing device being configured to cause a display to display the image, wherein
• the processing circuit is further configured to
• calculate a degree of similarity between the pieces of first sinogram data and the pieces of second sinogram data,
• extract a region in the first sinogram data, for each of a plurality of regions in the pieces of second sinogram data:
• generate the third sinogram data by merging a result of the extraction;
• and
• generate the image based on the generated third sinogram data, and
• the processing circuit is further configured to generate the pieces of first sinogram data by performing registration processing on a plurality of CT images and then performing forward projection on each of the CT images after the registration processing, wherein the CT images are CT images of mutually different heartbeats in a same time phase, and the plurality of pieces of first sinogram data are sinogram data of mutually different heartbeats in a same time phase.