公开(公告)号：US09934597B2

公开(公告)日：2018-04-03

申请号：US14483266

申请日：2014-09-11

Applicant: Carestream Health, Inc.

Inventor： Jay S. Schildkraut ,  Lawrence A. Ray ,  Krishnamoorthy Subramanyan

IPC: G06T11/00

CPC classification number: G06T11/005

Abstract: A method for reducing metal artifacts in a volume radiographic image reconstructs a first 3-D-image using measured projection images and forms a 3-D image metal mask that contains metal voxels. For each measured projection image, a projection metal mask is a projection of the 3-D image metal mask. A 3-D prior image contains voxels within the 3-D image metal mask. Voxel values of the first 3-D image outside the 3-D image metal mask are replaced with a value representative of air or soft tissue. Non-metal voxels of the 3-D prior image are modified according to a difference between a pixel value related to the nonmetal voxel and the corresponding pixel value in a calculated projection image. Composite projection images are formed by replacing measured projection image data for pixels within the projection metal mask with calculated projection image data. A metal artifact reduced 3-D image is reconstructed from composite projections.

公开(公告)号：US20160078647A1

公开(公告)日：2016-03-17

申请号：US14483266

申请日：2014-09-11

Applicant: Carestream Health, Inc.

Inventor： Jay S. Schildkraut ,  Lawrence A. Ray ,  Krishnamoorthy Subramanyan

IPC: G06T11/00

CPC classification number: G06T11/005

Abstract: A method for reducing metal artifacts in a volume radiographic image reconstructs a first 3-D-image using measured projection images and forms a 3-D image metal mask that contains metal voxels. For each measured projection image, a projection metal mask is a projection of the 3-D image metal mask. A 3-D prior image contains voxels within the 3-D image metal mask. Voxel values of the first 3-D image outside the 3-D image metal mask are replaced with a value representative of air or soft tissue. Non-metal voxels of the 3-D prior image are modified according to a difference between a pixel value related to the nonmetal voxel and the corresponding pixel value in a calculated projection image. Composite projection images are formed by replacing measured projection image data for pixels within the projection metal mask with calculated projection image data. A metal artifact reduced 3-D image is reconstructed from composite projections.

Abstract translation: 用于减小体积放射线照相图像中的金属伪影的方法使用测量的投影图像重建第一3D图像并形成包含金属体素的3-D图像金属掩模。 对于每个测量的投影图像，投影金属掩模是3-D图像金属掩模的投影。 3-D现有图像包含3-D图像金属掩模内的体素。 3-D图像金属掩模外部的第一个3-D图像的体素值被替换为代表空气或软组织的值。 根据与非金属体素相关的像素值与计算的投影图像中的对应像素值之间的差异，修改3D图像的非金属体素。 通过用计算出的投影图像数据代替投影金属掩模内的像素的测量投影图像数据来形成复合投影图像。 从复合投影重建金属伪影减少的3-D图像。