| 摘要 |
In an X-ray CT apparatus that performs imaging of a moving region as the object and reconstructs tomographic images suitable for the diagnostic objective, to improve the precision of analysis of a state of movement in a region or phase that is the diagnostic objective by narrowing the range and analyzing the movement information, the X-ray CT apparatus acquires electrocardiac information for the subject along with projection data, analyzes the movement information of the diagnostic region on the basis of the projection data and the electrocardiac information, determines an optimal phase that gives a state of movement suitable for reconstruction (for example, a state in which the amount of movement is the smallest) on the basis of the movement information, and reconstructs the tomographic images in the optimal phase. When doing so, to detect the optimal phase accurately in the phase or region of interest, the movement analysis range is adjusted so that disadvantageous movement information is thereby not included in the object of analysis. For example, the range of analysis is narrowed by applying an appropriate weight to movement information in a specified phase range or range of a somatic axis direction. |
