| 摘要 |
In an X-ray CT apparatus comprising an X-ray source irradiating X-rays to an object, an X-ray detector that is disposed oppositely to the X-ray source in a manner placing the object therebetween and is to detect transmitting X-rays through the object as projection data, a rotating means that rotates the X-ray source 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 source and the rotating means and a display means that displays the produced tomographic images, the X-ray CT apparatus further comprising 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 and a tube current control means that controls value of current to be fed to the X-ray tube based on the produced control profile.
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