X-ray CT apparatus and method of controlling it

   
   

For the purpose of determining an offset of the position of an X-ray tube from a prespecified position, and correcting axially projected data D1 and pixel projection data D2 based on the determined offset, proper axially projected data D1 can be obtained by an X-ray focal spot 2102 and a detector 2103 by determining axially projected data D1 at a point 2104 using projection data D0 obtained by a channel that detects an X-ray emitted from the X-ray focal spot 2102 and passing through the point 2104, and shifting the determined axially projected data D1 by a distance DIS1 in the (+)-direction of the x-axis.

 
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