Patent ID: 6504893
Filing Date: 2003-01-07
Classification: A61B

Abstract:
A method for examining a body region executing a periodic motion in an examination subject by conducting a spiral scan in a computed tomography apparatus having a system axis, said method comprising the steps of:providing an X-ray source, which emits an X-ray beam, and a multi-line radiation detector on which said X-ray beam is incident, said multi-line radiation detector having multiple lines of detector elements, said lines being disposed side-by-side along said system axis; rotating said X-ray source and said radiation detector around a system axis while producing a continuous relative displacement along said system axis between said X-ray source and said radiation detector, and said examination subject, to irradiate a body region of said examination subject executing a periodic motion from a plurality of different projection angles, to obtain projection data during an acquisition time; activating said X-ray source, for a time interval which is longer than said acquisition time, and deactivating said X-ray source during said continuous relative displacement, with X-rays being emitted by said X-ray source only during activation of said X-ray source, substantially synchronously with said periodic motion, so that said X-ray source is activated only during a selected phase of said periodic motion; and producing a computed tomogram of said region from said projection data.