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

1 . A reconstruction device, comprising:

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 plurality of pieces of first sinogram data with the plurality of 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, 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.

2 . The reconstruction device according to claim 1 , wherein the processing circuit is further configured to generate the second sinogram data by performing artifact correction processing on the CT images after the registration processing and performing forward projection on images after subjected to the artifact correction processing.

3 . The reconstruction device according to claim 2 , wherein the processing circuit is further configured to generate the pieces of first sinogram data by performing processing including pre-processing.

4 . The reconstruction device according to claim 2 , wherein the artifact correction processing is processing correcting a motion artifact.

5 . The reconstruction device according to claim 1 , wherein the CT images are time-series CT images being CT images acquired in same scan in different time phases.

6 . The reconstruction device according to claim 1 , wherein the CT images are CT images acquired in mutually different scans.

7 . The reconstruction device according to claim 1 , wherein

the processing circuitry is further configured to acquire the plurality of pieces of second sinogram data in which an artifact or noise is removed from the plurality of pieces of first sinogram data based on the plurality of pieces of first sinogram data.

8 . 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.

9 . 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.