| 摘要 |
PROBLEM TO BE SOLVED: To reduce artifact in an image reconstructed from computed tomographic image data. SOLUTION: As for each view of a gantry, related CT radiograph data is collected at different points concerning a cycle of patient's heartbeat cycle in rotation at each time of the gantry. Consequently, as for the rotation at each time of the gantry and every view of the gantry, the point in the cycle of heartbeat cycle at which an arbitrary given detector element of a detector array 2 is sampled differs from the point in a cycle of heartbeat cycle at which the same detector element is sampled in previous rotation. After collecting all CT radiograph data, radiograph is processed by interpolation algorithm 14 interpolating radiograph so as to match the selected point concerning the cycle of heartbeat cycle. Next, the interpolated radiograph is processed and is reversely projected using reconstitution algorithm 15 to form a three- dimensional(3D) image.
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