Patent ID: 7920671
Filing Date: 2011-04-05
Classification: A61B

Abstract:
1. An X-ray CT apparatus comprising: an X-ray tube configured to irradiate a cone-beam X-ray to an object; an X-ray detector, configured to detect the X-ray, including a group of plural X-ray detection elements arrayed in a matrix; an electrocardiogram configured to measure a heartbeat phase of the object; a set unit configured to set a required width of the group of the X-ray detection elements in a row direction, which is relatively insusceptible to an influence of a cone angle of the cone-beam X-ray; a generation unit configured to generate accumulation data by accumulating first projection data, based on first X-ray detection elements within the required width included in the group, with same channel in the row direction in preference to second projection data based on second X-ray detection elements outside the required width included in the group; a calculation unit configured to obtain a motion amount for each heartbeat phase measured by the electrocardiogram based on the accumulation data; and a determination unit configured to determine a specific heartbeat phase based on the motion amount for the each heartbeat phase.