PROBLEM TO BE SOLVED: To provide an image processing apparatus, an X-ray CT apparatus, and an image processing method capable of creating an image of an organ in a respiratory condition different from a respiratory condition when an image is taken without an increase in an exposure dose due to additional imaging, etc.SOLUTION: An image processing apparatus 122 creates a tomographic image in an inhalation period using measurement data taken by an X-ray CT apparatus 1 in a state in which a subject is inhaling, and creates a three-dimensional image of an attention region based on the created tomographic image in the inhalation period. The image processing apparatus 122 also creates a low time resolution tomographic image which is a tomographic image whose time resolution is lower than that of the tomographic image in the inhalation period, using the measurement data of the inhalation period. The image processing apparatus 122 calculates movement information on the attention region based on the tomographic image in the inhalation period and the low time resolution tomographic image, deforms the three-dimensional image of the attention region based on the calculated movement information, and creates a three-dimensional image whose respiratory condition is different from the respiratory condition when the image is taken.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】 撮影時とは異なる呼吸状態の臓器の画像を追加の撮影等による被曝量の増加なしに作成することが可能な画像処理装置、X線CT装置、及び画像処理方法を提供する。【解決手段】 画像処理装置122は、X線CT装置1により被検者が息を吸った状態で撮影した計測データを用いて吸期の断層像を作成し、作成した吸期の断層像に基づいて注目領域の3次元画像を作成する。また、画像処理装置122は、吸期の計測データを用いて上述の吸期の断層像より時間分解能が低い断層像である低時間分解能断層像を作成する。画像処理装置122は吸期の断層像及び低時間分解能断層像に基づいて注目領域の移動情報を算出し、算出した移動情報に基づいて注目領域の3次元画像を変形し、撮影時とは呼吸状態の異なる3次元画像を作成する。【選択図】図2
