Patent ID: 7636416

Claim:
An X-ray CT apparatus comprising: an X-ray tube irradiating X-rays to an object, an X-ray detector that is disposed oppositely to the X-ray tube in a manner placing the object therebetween and is to detect transmitted X-rays through the object as projection data, a rotating means that rotates the X-ray tube and the X-ray detector, a control means that collects the projection data from plural angular directions obtained through rotation of the X-ray tube and the X-ray detector by the rotating means, performs reconstruction computation of these collected projection data to produce tomographic images of the object as well as controls the X-ray tube and the rotating means, a display means that displays the produced tomographic images, a projection data analysis means that reconstructs a tomographic image at an imaging portion of the object used for analysis from the projection data and produces a control profile by reprojecting the reconstructed tomographic image during real scanning, and a tube current control means that modifies or renews, during said real scanning and based on the control profile produced by the projection data analysis means, a value of current to be fed back to the X-ray tube.