Patent ID: 8130897
Filing Date: 2012-03-06
Classification: A61B,H01J

Abstract:
1. An x-ray computed tomography apparatus comprising: a vacuum housing surrounding an examination volume having a system axis proceeding therethrough, said vacuum housing being mounted to rotate around said system axis and containing an anode ring therein that at least partially surrounds said examination volume, said anode ring being connected to said vacuum housing in a rotationally fixed manner, said anode ring being a component of an x-ray source that generates a focus on said anode ring that rotates on said anode ring around said examination volume to irradiate an examination subject located within the examination volume with x-rays from different directions; a rotating frame mounted to rotate around said system axis; a radiation detector mounted on said frame at an opposite side of said system axis from said focus that detects x-rays from said focus after passage of said x-rays through said examination volume; a control unit that operates said frame and said x-ray source to rotate said radiation detector and said focus around said system axis synchronously and in the same direction while maintaining said detector opposite said focus; an actuator operated by said control unit that rotates said vacuum housing around said system axis; and said control unit also being configured to rotate said anode ring around said system axis in a rotation direction opposite to rotation of the focus around the system axis, while said focus is rotating around said system axis.