Radiation tomographic imaging apparatus and method

The present invention relates to a radiation tomographic imaging apparatus and method, and particularly to a radiation tomographic imaging apparatus and method for producing multi-slice tomographic images of a region through which a radiation beam having a width and a thickness passes. A radiation tomographic imaging apparatus and method are provided in which the slice thickness can be dynamically switched during scanning, and the emission center of radiation can be arbitrarily moved in a direction of carrying a subject. There are provided an X-ray tube moving section capable of moving the emission center of an X-ray tube in a z-direction; a collimator having an aperture whose openness can be adjusted, for forming the emitted X-rays into an X-ray beam having a certain width and thickness to irradiate a desired region on a detector element array with the X-ray beam ; a data collecting section for dynamically selecting or adding in varying combination the detected signal input supplied from the detector element rows in the detector element array during scanning in response to a control signal CTL; and a central processing apparatus for changing the emission center of the X-ray tube , the openness of the aperture in the collimator , and the data to be collected by the data collecting section corresponding to status information input via an input device