| 摘要 |
The X-ray CT system and control program thereof according to the embodiment comprise an X-ray tube, a collimator, and a controller. The X-ray tube has an emission surface of X-rays and is configured such that the size of an effective focal spot that is the apparent size of the emission surface when the emission surface is observed from the side where X-rays are irradiated is made smaller at one end of a cone angle and the size of the effective focal spot is made increasingly larger at the other end of the cone angle. The controller is configured to select the effective focal spot with any size from small to large by controlling the collimator.
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