A tomography apparatus (100, 100b, 100c) comprising: an X-ray generator; a data obtainer (510, 510a) configured to perform a tomography scan on a moving object (10, 300) using a table, a field of view and a pitch and to obtain raw data (310, 312, 314) of the object (10, 300); and an image processor (126, 520) configured to: reconstruct a first tomography image (330, 2602) of the object (10, 300) for a first slice section in a first phase from the raw data (310, 312, 314); reconstruct a second tomography image (330, 2602) in a second phase (TP1, TP2, TP3, TP4, TP5) which is different from the first phase (1408, TP6), for the first slice section of the object (10, 300) by using the raw data (310, 312, 314) and motion information indicating a three-dimensional motion of the object (10, 300), characterized in that the second phase (TP1, TP2, TP3, TP4, TP5) is a phase beyond the reconstructable phase range (TP6, TP7, TP8, TP9) of the raw data (310, 312, 314) obtained for the first slice section, wherein the said reconstructable phase range (TP6, TP7, TP8, TP9) is a phase range in which reconstruction may be performed by using a reconstruction method used by the tomography apparatus (100, 100b, 100c). an X-ray generator; a data obtainer (510, 510a) configured to perform a tomography scan on a moving object (10, 300) using a table, a field of view and a pitch and to obtain raw data (310, 312, 314) of the object (10, 300); and an image processor (126, 520) configured to: reconstruct a first tomography image (330, 2602) of the object (10, 300) for a first slice section in a first phase from the raw data (310, 312, 314); reconstruct a second tomography image (330, 2602) in a second phase (TP1, TP2, TP3, TP4, TP5) which is different from the first phase (1408, TP6), for the first slice section of the object (10, 300) by using the raw data (310, 312, 314) and motion information indicating a three-dimensional motion of the object (10, 300), characterized in that the second phase (TP1, TP2, TP3, TP4, TP5) is a phase beyond the reconstructable phase range (TP6, TP7, TP8, TP9) of the raw data (310, 312, 314) obtained for the first slice section, wherein the said reconstructable phase range (TP6, TP7, TP8, TP9) is a phase range in which reconstruction may be performed by using a reconstruction method used by the tomography apparatus (100, 100b, 100c). reconstruct a first tomography image (330, 2602) of the object (10, 300) for a first slice section in a first phase from the raw data (310, 312, 314); reconstruct a second tomography image (330, 2602) in a second phase (TP1, TP2, TP3, TP4, TP5) which is different from the first phase (1408, TP6), for the first slice section of the object (10, 300) by using the raw data (310, 312, 314) and motion information indicating a three-dimensional motion of the object (10, 300), characterized in that the second phase (TP1, TP2, TP3, TP4, TP5) is a phase beyond the reconstructable phase range (TP6, TP7, TP8, TP9) of the raw data (310, 312, 314) obtained for the first slice section, wherein the said reconstructable phase range (TP6, TP7, TP8, TP9) is a phase range in which reconstruction may be performed by using a reconstruction method used by the tomography apparatus (100, 100b, 100c).