公开(公告)号：US20140044234A1

公开(公告)日：2014-02-13

申请号：US14057836

申请日：2013-10-18

Applicant: FUJIFILM Corporation

Inventor： Atsushi HASHIMOTO ,  Takuji TADA ,  Dai MURAKOSHI

IPC: A61B6/00

CPC classification number: A61B6/484 ,  A61B6/4035 ,  A61B6/4291

Abstract: An X-ray imaging apparatus comprises a first grid, a second grid, and an X-ray image detector. The first grid passes X-rays emitted from an X-ray source and produces a first periodic pattern image. The second grid opposes the first grid. The second grid partly blocks the first periodic pattern image and produces a second periodic pattern image with moiré fringes. The X-ray image detector detects the second periodic pattern image and produces image data. The X-ray image detector has pixels arranged in two dimensions in X and Y directions. The M pixels arranged in the Y direction form one group. The group is shifted in the Y direction by the number of the pixels less than M each time. A phase of an intensity modulated signal, composed of pixel values of the pixels in the each shifted group, is calculated. Thereby a differential phase image is produced.

Abstract translation: X射线成像装置包括第一格栅，第二格栅和X射线图像检测器。 第一格栅通过从X射线源发射的X射线并产生第一周期性图案图像。 第二个网格反对第一个网格。 第二格栅部分地阻挡第一周期性图案图像，并产生具有莫尔条纹的第二周期性图案图像。 X射线图像检测器检测第二周期性图案图像并产生图像数据。 X射线图像检测器具有在X和Y方向上二维排列的像素。 以Y方向排列的M个像素形成一组。 该组在Y方向移动每次小于M的像素数。 计算由每个移位组中的像素的像素值组成的强度调制信号的相位。 从而产生差分相位图像。