PROBLEM TO BE SOLVED: To facilitate comparative observation of a cross sectional image.SOLUTION: An image processing device acquires first three-dimensional image data and second three-dimensional image data, then sets a reference point to the first three-dimensional image data and the second three-dimensional image data, then creates a first cross-sectional image in which the reference point serves as reference, from the first three-dimensional image data, then creates a second cross-sectional image in which the reference point serves as reference, from the second three-dimensional image data corresponding to the cross section of the first cross sectional image, and then displays the first cross sectional image and the second cross sectional image in a symmetric manner.SELECTED DRAWING: Figure 3【課題】断面画像の比較観察が容易にする。【解決手段】画像処理装置は、第１の三次元画像データと第２の三次元画像データを取得し、該第１の三次元画像データと該第２の三次元画像データに対して、基準点を設定し、該第１の三次元画像データから該基準点を基準とする第１の断面画像を生成するとともに、該第１の断面画像の断面に対応させて、該第２の三次元画像データから該基準点を基準とする第２の断面画像を生成し、該第１の断面画像と該第２の断面画像を対称にして表示させる。【選択図】図３
