Patent ID: 7142630
Filing Date: 2006-11-28
Classification: A61B

Abstract:
1. An X-ray computed tomography apparatus, comprising: an X-ray tube configured to generate X-rays with which an object to be examined is irradiated; a high voltage generator configured to generate a high voltage to be applied to said X-ray tube; an X-ray detector configured to have a plurality of X-ray detection element lines for detecting X-rays transmitted through the object; a scanogram generating unit configured to generate a scanogram based on an output from said X-ray detector; a reconstructing unit configured to reconstruct an image based on the output from said X-ray detector; a tube current determining unit configured to determine a tube current value for said X-ray tube, for a given slice position, based on pixel values of a plurality of pixels included in a two-dimensional partial region of the scanogram, the two-dimensional partial region being defined by slice and channel directions, wherein the partial region is different for each given slice position; and a control unit configured to control said high voltage generator based on the determined tube current value.