X-ray CT apparatus and image reconstruction method
AssigneeHitachi, Ltd.
InventorsShuichi Okamoto, Hiroto Kokubun, Fuyuhiko Teramoto
Life of this patent
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Abstract
To provide an X-ray CT apparatus and an image reconstruction method that can generate an image in which motion influence of a site to be scanned is reduced, the image processing device 403 of the X-ray CT apparatus 1 calculates a reconstruction data range which is a range of projection data to be used for reconstruction based on a motion direction of the site to be scanned. An image is reconstructed using the projection data in the calculated reconstruction data range. The reconstruction data range is set as the projection data in a projection range of at least 180 degrees or more including a projection direction that approximately corresponding to the motion direction of the site to be scanned.
Claims16
An X-ray CT apparatus comprising:
- an X-ray source for irradiating an X-ray to an object from the surroundings;
- an X-ray detector for detecting an X-ray transmitted through the object;
- an image processing device for generating projection data from the detected information about the transmitted X-ray and reconstructing a tomographic image of the object based on the projection data;
- and
- a display device for displaying the tomographic image,
- wherein the image processing device comprises:
- a motion direction obtaining unit for obtaining a motion direction of a site to be scanned;
- a reconstruction data range calculation unit for calculating a reconstruction data range that is a range of projection data to be used for reconstruction based on the motion direction;
- and
- an image reconstruction unit for reconstructing an image using the projection data of the calculated reconstruction data range.
An image reconstruction method including:
- a projection data generation step of generating projection data in which the inside of an object was scanned;
- a motion direction obtaining step of obtaining a motion direction of a site to be scanned;
- a reconstruction data range calculation step of calculating a reconstruction data range that is a range of projection data to be used for reconstruction based on the motion direction;
- and
- an image reconstruction step of reconstructing an image using projection data in the calculated reconstruction data range.
Dependencies are inferred from the claim text.