PROBLEM TO BE SOLVED: To secure a positional relationship of an acquired image with a high degree of accuracy by accurately detecting the amount of displacement of a focus of an X-ray, in a tomographic imaging system.SOLUTION: Markers Ma and Mb are arranged in positions in which distances YMa and YMb from a focus 2 are different from each other, in a direction of a perpendicular drawn down to a detection surface 6 from the focus 2 of an X-ray, in a reference position. Z-direction displacement ΔZF of the focus 2 is calculated on the basis of a Z-direction difference ΔZIM2 between marker images IMa2 and IMb2 detected by the detection surface 6 after a series of imaging operations.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】断層画像撮影システムにおいて、X線の焦点の変位量を精度良く検知して、取得された画像の位置関係を高精度に担保する。【解決手段】基準位置において、X線の焦点2から検出面6に垂らした垂線方向において、焦点2からの距離YMa、YMbが異なる位置にマーカMa,Mbを配置し、一連の撮影動作後に検出面6で検出されるマーカ像IMa2,IMb2のZ方向の差分ΔZIM2に基づき、焦点2のZ方向の変位量ΔZFを算出する。【選択図】図1
