Tomography apparatus and method of processing tomography image

1. A tomography apparatus comprising:

a data acquirer configured to:

acquire a first image corresponding to a first time point and a second image corresponding to a second time point, based on data that is obtained from performing tomography on a moving object;

acquire first information indicating a movement of the object between the first time point and the second time point; and

determine a motion reliability indicating a degree to which the movement of the object corresponds to a physical movement, based on the first information; and

an image reconstructor configured to reconstruct a target image indicating the object at a target time point, based on the motion reliability.

2. The apparatus of claim 1 , wherein the image reconstructor is further configured to:

determine whether to reconstruct the target image by performing motion compensation on the target image, based on the motion reliability; and

generate the target image based on the determining.

3. The apparatus of claim 1 , wherein the first information comprises:

right directional vectors indicating the movement of the object from the first time point to the second time point; and

reverse directional vectors indicating the movement of the object from the second time point to the first time point.

4. The apparatus of claim 3 , wherein the data acquirer is further configured to determine the motion reliability based on a motion error of a right directional vector, among the right directional vectors, and a reverse directional vector corresponding to the right directional vector, among the reverse directional vectors.

5. The apparatus of claim 4 , wherein the motion reliability is proportional to a reciprocal of the motion error.

6. The apparatus of claim 1 , wherein the image reconstructor is further configured to reconstruct the target image by performing motion compensation on the target image in response to the motion reliability being greater than or equal to a value.

7. The apparatus of claim 1 , wherein the image reconstructor is further configured to:

divide the target image into partial sections; and

for each of the partial sections, in response to the motion reliability within a partial section being greater than or equal to a value, perform motion compensation on the partial section.

8. The apparatus of claim 1 , wherein the image reconstructor is further configured to reconstruct the target image by performing motion compensation on the target image with a weighted value corresponding to the motion reliability.

9. The apparatus of claim 1 , wherein the image reconstructor is further configured to determine the motion reliability based on the first information for each of voxels in the target image.

10. The apparatus of claim 9 , further comprising a display configured to display a color-coded image marking, on each of the voxels, a color corresponding to the motion reliability.

11. The apparatus of claim 1 , further comprising a display configured to display a user interface for determining whether to perform motion compensation on the target image, the user interface being configured to receive a user input.

12. The apparatus of claim 1 , further comprising a display configured to display a screen indicating whether motion compensation is performed for each of partial sections of the target image.

13. The apparatus of claim 1 , further comprising a display configured to display at least one among the motion reliability, the target time point, and the target image.

14. The apparatus of claim 1 , wherein the data acquirer is further configured to:

acquire reconstructed images that are motion compensated at time points between the first time point and the second time point, based on the first information;

determine an error by comparing estimated projection data that is acquired by a forward projection of the reconstructed images and measured projection data that is acquired by computed tomography imaging at the time points; and

determine the motion reliability based on the error.

15. A method of processing a tomography image, the method comprising:

acquiring a first image corresponding to a first time point and a second image corresponding to a second time point, based on data that is obtained from performing tomography on a moving object;

acquiring first information indicating a movement of the object between the first time point and the second time point;

determining a motion reliability indicating a degree to which the movement of the object corresponds to a physical movement, based on the first information; and

reconstructing a target image indicating the object at a target time point, based on the motion reliability.

16. The method of claim 15 , wherein the reconstructing comprises:

determining whether to reconstruct the target image by performing motion compensation on the target image, based on the motion reliability; and

generating the target image based on the determining.

17. The method of claim 15 , wherein the reconstructing comprises:

reconstructing the target image by performing motion compensation on the target image in response to the motion reliability being greater than or equal to a value.

18. The method of claim 15 , wherein the reconstructing comprises:

dividing the target image into partial sections; and

for each of the partial sections, in response to the motion reliability within a partial section being greater than or equal to a value, performing motion compensation on the partial section.

19. The method of claim 15 , wherein the reconstructing comprises:

reconstructing the target image by performing motion compensation on the target image with a weighted value corresponding to a motion reliability.

20. A non-transitory computer-readable recording medium storing a program comprising instructions to cause a computer to perform the method of claim 15 .