X-ray CT apparatus

Abstract

An X-ray CT apparatus includes a plurality of X-ray tubes, a plurality of X-ray detectors corresponding to the plurality of X-ray tubes, respectively, a support mechanism which supports the X-ray tubes and the X-ray detectors to allow the X-ray tubes and the X-ray detectors to rotate about a single rotation axis, a reconstruction unit which reconstructs image data on the basis of outputs from the X-ray detectors, and a plurality of filters which are respectively provided for the plurality of X-ray tubes and each have a characteristic in which an X-ray path length changes along a curve approximate to an inverted Gaussian curve from the rotation center to the two ends of an X-ray beam.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-191922 filed on June 30, 2005, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a multi-tube type X-ray CT apparatus equipped with a plurality of pairs of X-ray tubes and detectors and a filter. Background technique [0004] An X-ray CT apparatus (X-ray computerized tomography apparatus) reconstructs a tomographic image from a plurality of projection data sets collected from a plurality of directions by rotating a pair consisting of an X-ray tube and a detector. A multi-tube type X-ray CT apparatus is equipped with a plurality of the above pairs. A multi-tube type X-ray CT apparatus is described, for example, in JP-A-2004-73406. Japanese Patent Laid-Open No. 2004-73406 includes an X-ray tube for treatment and an X-ray tube for dat...

AI Technical Summary

Problems solved by technology

[0005] However, there is a problem with the multi-tube type X-ray CT apparatus that if Figure 4 As shown, the scattered rays formed by the X-rays generated by a pair of X-ray tubes 122 (121) are detected by another pair of X-ray detectors 131 (132)

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