Being the x-ray CT device which in order to offer the x-ray CT device which it creates & displays three dimensional image whose continuity is high vis-a-vis the internal organs which have the movement, has with the x-ray generation section and the x-ray sensing station in order to acquire the projection data of the suffering inspection body from multiple angles, creates the optional profile image of the aforementioned suffering inspection body on the basis of the aforementioned projection data, the selection section and the aforementioned profile image which select the field where it includes the target internal organs which move from midst of the aforementioned profile image cyclically on the basis of the continuity of the aforementioned target internal organs in the direction which crosses, cycle of the aforementioned target internal organsWhen creating the synchronous profile image which in the movement synchronization it could point, the synchronous profile image creation department which creates the aforementioned synchronous profile image on the basis of the projection data which corresponds to the aforementioned synchronous phase which is decided in the synchronous phase decisive section and the aforementioned synchronous phase decisive section which decide the synchronous phase which is used and the indicatory department which displays the aforementioned synchronous profile image and, it features that it has.動きのある臓器に対し、連続性の高い三次元画像を作成・表示するX線CT装置を提供するために、被検体の投影データを複数の角度から取得するためのX線発生部とX線検出部とを備え、前記投影データに基づいて前記被検体の任意の断面画像を作成するX線CT装置であって、前記断面画像の中から周期的に動く対象臓器を含む領域を抽出する抽出部と、前記断面画像と直交する方向における前記対象臓器の連続性に基づいて、前記対象臓器の周期的な動きに同期させた同期断面画像を作成するときに用いる同期位相を決定する同期位相決定部と、前記同期位相決定部で決定された前記同期位相に対応する投影データに基づき前記同期断面画像を作成する同期断面画像作成部と、前記同期断面画像を表示する表示部と、を備えることを特徴とする。
