A computed tomography diagnostic imaging apparatus (400/600) comprising: an X-ray generating unit; an X-ray detecting unit; a rotating frame configured to rotate the X-ray generating unit and the X-ray detecting unit around a predetermined rotation axis to image an object; an image acquirer (410/610) configured to: acquire a first image (910/1110) obtained by imaging an object in a first section of a first cycle and a second image (920/1120) obtained by imaging the object in a second section of a second cycle, wherein each cycle corresponds to a regular movement of the object, and a position of the second section in the second cycle corresponds to a position of the first section in the first cycle; wherein the first image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a first angular section, wherein the second image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a second angular section, and wherein the first angular section and second angular section include a symmetrical angular section or an identical angular section; and an image reconstructor (420/620) configured to: based on one of the first image and the second image, extract information about a movement of the other one of the first image and the second image, change the other one of the first image and the second image based on the extracted movement information, and generate a reconstructed image based on the changed image and the unchanged image. an X-ray generating unit; an X-ray detecting unit; a rotating frame configured to rotate the X-ray generating unit and the X-ray detecting unit around a predetermined rotation axis to image an object; an image acquirer (410/610) configured to: acquire a first image (910/1110) obtained by imaging an object in a first section of a first cycle and a second image (920/1120) obtained by imaging the object in a second section of a second cycle, wherein each cycle corresponds to a regular movement of the object, and a position of the second section in the second cycle corresponds to a position of the first section in the first cycle; wherein the first image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a first angular section, wherein the second image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a second angular section, and wherein the first angular section and second angular section include a symmetrical angular section or an identical angular section; and an image reconstructor (420/620) configured to: based on one of the first image and the second image, extract information about a movement of the other one of the first image and the second image, change the other one of the first image and the second image based on the extracted movement information, and generate a reconstructed image based on the changed image and the unchanged image. acquire a first image (910/1110) obtained by imaging an object in a first section of a first cycle and a second image (920/1120) obtained by imaging the object in a second section of a second cycle, wherein each cycle corresponds to a regular movement of the object, and a position of the second section in the second cycle corresponds to a position of the first section in the first cycle; wherein the first image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a first angular section, wherein the second image is obtained by imaging the object while the rotating frame rotates over an angle of less than 180° forming a second angular section, and wherein the first angular section and second angular section include a symmetrical angular section or an identical angular section; and an image reconstructor (420/620) configured to: based on one of the first image and the second image, extract information about a movement of the other one of the first image and the second image, change the other one of the first image and the second image based on the extracted movement information, and generate a reconstructed image based on the changed image and the unchanged image. based on one of the first image and the second image, extract information about a movement of the other one of the first image and the second image, change the other one of the first image and the second image based on the extracted movement information, and generate a reconstructed image based on the changed image and the unchanged image.