Patent ID: 6320929
Filing Date: 2001-11-20
Classification: A61B,G21K,Y10S

Abstract:
A method for scanning an examination subject with a computed tomography device having an X-ray source with a focus from which an X-ray beam, having a beam cross section, emanates, and a detector system having a plurality of detector rows, each detector row containing a plurality of detector elements, and said computed tomography device having a system axis, said method comprising the steps of:disposing an examination subject between said X-ray source and said detector system;conducting a scan of said examination subject by displacing at least said focus of said X-ray source relative to said system axis to irradiate said examination subject with said X-ray beam from a plurality of different positions relative to said system axis;generating detector signals with said detector system corresponding to radiation incident on said detector system during said scan;supplying said signals to a computer and, in said computer, reconstructing an image of said examination subject from said detector signals; andmodifying said cross section of said X-ray beam during said scan so that, at all times, substantially only a region of said examination subject which is used for reconstructing said image is penetrated by said X-ray beam.