PROBLEM TO BE SOLVED: To essentially reduce discontinuity of images due to deflection of a top plate without the need of preliminary scanning.SOLUTION: An X-ray computer tomography device includes: a bed 121 having a structure for movably supporting a top plate 120 for mounting a subject on one side an X-ray generation part 101 for generating X-rays a detection part 103 for detecting the X-rays generated from the X-ray generation part and transmitted through the subject a rotating mechanism 102 for rotating the X-ray generation part and the detection part around a prescribed rotary axis a reconfiguration processing part 114 for reconfiguring a plurality of three-dimensional images on the basis of the output of the detection part a top plate extraction part 113 for extracting a top plate area from each of the plurality of three-dimensional images a shift amount measuring part 117 for measuring the shift amount of a front end position of the top plate area on one three-dimensional image and the rear end position of the top plate area on the three-dimensional image in the three-dimensional images adjacent to each other among the plurality of three-dimensional images and a composite image generation part for generating a composite image in which the level difference of a top plate position is dissolved by combining the plurality of three-dimensional images while correcting positions on the basis of the shift amount.COPYRIGHT: (C)2014,JPO&INPIT【課題】天板たわみによる画像の不連続性を予備スキャンを不要にして本質的に軽減すること。【解決手段】X線コンピュータ断層撮影装置は、被検体を載置する天板120を移動可能に片側で支持する構造を有する寝台121と、X線を発生するX線発生部101と、X線発生部から発生され被検体を透過したX線を検出する検出部103と、X線発生部と検出部とを所定の回転軸回りに回転させる回転機構102と、検出部の出力に基づいて複数の3次元画像を再構成する再構成処理部114と、複数の3次元画像各々から天板領域を抽出する天板抽出部113と、複数の3次元画像のうち隣り合う3次元画像において、一方の3次元画像上の天板領域の前端位置との3次元画像上の天板領域の後端位置とのズレ量を測定するズレ量測定部117と、ズレ量に基づいて位置補正しながら複数の3次元画像を合成して天板位置の段差が解消された合成画像を発生する合成画像発生部とを具備する。【選択図】図1
