Patent ID: 7426255
Filing Date: 2008-09-16
Classification: A61B

Abstract:
1. An X-ray CT apparatus comprising: motion information acquisition means that acquires periodical motion information on a motion portion of an object to be examined; a detector that rotates together with an X-ray source and detects X-rays applied to the object from the X-ray source to acquire projection data per collection region; reconstruction means that processes the projection data resulting from the detector to reconstruct a tomogram of the object; and reconstruction time aspect specification means that specifies a time aspect in the periodical motion information to be reconstructed, wherein the X-ray CT apparatus includes means that modulates or controls the X-ray source using a composite mode comprising a motion period-dependent control pattern and a transmittance thickness-dependent control pattern, in which control utilizing the motion period-dependent control pattern has the effect that the intensity of the X-ray applied from the X-ray becomes relatively large in the specific time aspect, and control utilizing the transmittance thickness-dependent control pattern has the effect that the intensity of the X-rays applied from the X-ray source varies depending on the X-ray transmittance thickness of the object, and an output level of the detector is maintained at a constant, and the reconstruction means reconstructs the tomogram of the motion portion from the projection data of the collection region corresponding to the time aspect specified by the reconstruction time aspect specification means.