Tomography apparatus and method of reconstructing tomography image thereof
View Patent ↗A tomography apparatus includes a data obtainer and an image processor. The data obtainer performs a tomography scan on a moving object and obtains raw data of the object The image processor reconstructs a first tomography image of the object for a first slice section in a first phase from the raw data and reconstructs a second tomography image in a second phase, which is different from the first phase, for the first slice section of the object by using the raw data. The image processor also generates motion information indicating a three-dimensional (3D) motion of the object. The second phase is a phase beyond a phase range of the raw data.
1. A tomography apparatus comprising:
a data obtainer configured to perform a tomography scan on a moving object and obtain raw data of the object; and
an image processor configured to:
reconstruct a first tomography image of the object for a first slice section in a first phase from the raw data; and
reconstruct a second tomography image in a second phase, which is different from the first phase, for the first slice section of the object by using the raw data and motion information indicating a three-dimensional (3D) motion of the object,
wherein the second phase is a phase beyond a phase range of the raw data.
2. The tomography apparatus of claim 1 , wherein:
the data obtainer is configured to perform a tomography scan on the object over an angular range including at least one pair of facing angular sections, and
the image processor is configured to:
reconstruct one pair of images corresponding to the at least one pair of facing angular sections by using the raw data; and
obtain the motion information by using the one pair of images.
3. The tomography apparatus of claim 1 , wherein:
the data obtainer is configured to obtain the raw data in a first phase range that is shorter than one cycle of motion of the object, and
the image processor is configured to reconstruct a plurality of the second tomography images having different phases from each other in the one cycle of motion of the object from the raw data.
4. The tomography apparatus of claim 1 , wherein the object is a heart.
5. The tomography apparatus of claim 1 , wherein the first phase is a phase with a lowest motion speed in one cycle of motion of the object.
6. The tomography apparatus of claim 1 , wherein the motion information of the object is previously stored.
7. The tomography apparatus of claim 1 , further comprising:
a display configured to display the first tomography image; and
an input device configured to receive a user input that selects a phase,
wherein the image processor is configured to reconstruct the second tomography image of the object in the second phase, which is different from the first phase, in response to the user input that selects the second phase, and
wherein the display is configured to display the second tomography image.
8. The tomography apparatus of claim 1 , wherein the data obtainer comprises:
a table configured to move the object along a first axis;
an X-ray generator configured to:
rotate around the object at a constant speed on a plane perpendicular to the first axis; and
irradiate X-rays; and
an X-ray detector configured to detect the X-rays,
wherein the data obtainer is configured to obtain the raw data by detecting the irradiated X-rays in the X-ray detector while the object is moved along the first axis and the X-ray generator rotates around the object.
9. The tomography apparatus of claim 8 , further comprising:
a display configured to display the first tomography image; and
an input device configured to receive a user input that selects at least one of a phase and a position of the object on the first axis,
wherein the image processor is configured to reconstruct a tomography image in the selected phase from a tomography image in the first phase obtained at the selected position on the first axis, and
wherein the display is configured to display the second tomography image.
10. The tomography apparatus of claim 1 , wherein the object is a heart, and
wherein the image processor is configured to:
reconstruct a diastolic tomography image corresponding to diastole of the heart as the first tomography image in the first phase;
reconstruct a systolic tomography image corresponding to systole of the heart as the second tomography image in the second phase; and
determine whether a myocardial bridge occurs by comparing the diastolic tomography image with the systolic tomography image.
11. A method of reconstructing a tomography image, the method comprising:
performing a tomography scan on a moving object and obtaining raw data of the object;
reconstructing a first tomography image of the object for a first slice section in a first phase from the raw data; and
reconstructing a second tomography image in a second phase, which is different from the first phase, for the first slice section of the object by using the raw data and motion information indicating a three-dimensional (3D) motion of the object,
wherein the second phase is a phase beyond a phase range of the raw data.
12. The method of claim 11 , further comprising:
performing a tomography scan on the object and obtaining over an angular range including at least one pair of facing angular sections;
reconstructing one pair of images corresponding to the at least one pair of facing angular sections by using the raw data; and
obtaining the motion information by using the one pair of images.
13. The method of claim 11 , further comprising:
obtaining the raw data in a first phase range that is shorter than one cycle of motion of the object; and
reconstructing a plurality of the second tomography images having different phases from each other in the one cycle of the motion of the object from the raw data.
14. The method of claim 11 , wherein the object is a heart.
15. The method of claim 11 , wherein the first phase is a phase with a lowest motion speed in one cycle of motion of the object.
16. The method of claim 11 , wherein the motion information of the object is previously stored.
17. The method of claim 11 , further comprising:
receiving a user input that selects a phase;
reconstructing the second tomography image of the object in the second phase, which is different from the first phase, in response to the user input that selects the second phase; and
displaying the second tomography image.
18. The method of claim 11 , wherein the performing the tomography scan comprises obtaining the raw data by detecting irradiated X-rays while the object is moved along a first axis and a X-ray generator rotates around the object.
19. The method of claim 18 , further comprising:
receiving a user input that selects at least one of a phase and a position of the object on the first axis;
reconstructing a tomography image in the selected phase from a tomography image in the first phase obtained at the selected position on the first axis; and
displaying the second tomography image.
20. A computer-readable recording medium storing a program code when executed performs a method of reconstructing a tomography image, the method comprising:
performing a tomography scan on a moving object and obtaining raw data of the object;
reconstructing a first tomography image of the object for a first slice section in a first phase from the raw data; and
reconstructing a second tomography image in a second phase, which is different from the first phase, for the first slice section of the object by using the raw data and motion information indicating a three-dimensional (3D) motion of the object,
wherein the second phase is a phase beyond a phase range of the raw data.