Patent ID: 7486763
Filing Date: 2009-02-03
Classification: A61B,G01N

Abstract:
1. A method for producing a first shadow image with the aid of an X ray computer tomograph at a prescribed first angular position, comprising: continuously rotating an X ray source, rotatable about a z-axis, together with a matrix detector fitted in an opposing arrangement about a body that is continuously moved in a direction parallel to the z-axis in order to generate a spiral movement relative to the body; transirradiating the body with X radiation at a prescribed first angular position of the X ray source, and as a consequence thereof, converting signals detected by the matrix detector into a data record corresponding thereto; and producing the first shadow image using at least one such data record, the shadow image being produced during the continuous spiral scanning movement of the X ray source relative to the body to be examined, the X ray source being operated during each revolution of the continuous spiral movement in a pulsed fashion only when traversing a prescribed sector including the first angular position, wherein, when the prescribed first angular position is reached, a first X ray pulse is generated for producing the first shadow image and remains switched off outside the sector.