| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily remove an artifact generated due to an X-ray beam photon shortage condition by determining an X-ray beam boundle having a minimum value on a certain projection data set, and dynamically adjusting DC on projection data on the basis of this determined minimum X-ray beam bundle. SOLUTION: A detector element 20 generates an electric signal to show intensity of an incident X-ray beam, that is, an attenuation quantity of the beam while passing through a patient 22, and data from the detector element 20 is sampled by a data gathering system(DAS) in a control mechanism 26. A high speed image is reconstituted on the basis of X-ray data by an image reconstituting device 34. In this case, an X-ray beam bundle having a minimum value is determined on a projection data set to a certain view (a view number k), and projection data in the projection data set is adjusted according to an expression (Pk =Pk-ζkγwk ) when a function of a minimum bundle is denoted byζk and a scaling factor byγand a load factor by Wk .</p> |
