Motion correction of a reconstructed three-dimensional image dataset

A biplane X-ray device comprising:

• two acquisition assemblies;
• and
• a controller configured for motion correction of a three-dimensional (3D) image dataset reconstructed from a plurality of two-dimensional (2D) projection images acquired by the biplane X-ray device, the motion correction relating to a movement in a region under examination of a patient that is covered by the 3D image dataset, the motion correction comprising:
• measurement, by the two acquisition assemblies, at an angular offset;
• acquisition of the plurality of 2D projection images, the acquisition of the plurality of 2D projection images comprising coverage, with each of the two acquisition assemblies, of an angular range of projection angles and acquisition of pairs of projection images of the region under examination at least substantially simultaneously at each acquisition time instant;
• automatically localization, for each of the pairs of projection images, of at least one marker object lying in the region under examination and imaged in the plurality of projection images, such that 2D location information is determined;
• determination of 3D position information about the at least one marker object using acquisition geometries of the respective pair of projection images, the acquisition geometries being defined by the projection angles;
• ascertainment of motion information describing a motion profile of the at least one marker object over an acquisition period from the determined 3D position information at different acquisition time instants;
• and
• use of the ascertained motion information for motion correction of the 3D image dataset.

In a non-transitory computer-readable storage medium that stores instructions executable by one or more processors to motion correct a three-dimensional (3D) image dataset reconstructed from a plurality of two-dimensional (2D) projection images acquired by an X-ray device, the motion correction relating to a movement in a region under examination of a patient that is covered by the 3D image dataset, the instructions comprising:

• using a biplane X-ray device having two acquisition assemblies that measure at an angular offset;
• acquiring the plurality of 2D projection images, the acquiring of the plurality of 2D projection images comprising covering, with each of the two acquisition assemblies, an angular range of projection angles and acquiring pairs of projection images of the region under examination at least substantially simultaneously at each acquisition time instant;
• automatically localizing, for each of the pairs of projection images, at least one marker object lying in the region under examination and imaged in the plurality of projection images, such that 2D location information is determined;
• determining 3D position information about the at least one marker object using acquisition geometries of the respective pair of projection images, the acquisition geometries being defined by the projection angles;
• ascertaining motion information describing a motion profile of the at least one marker object over an acquisition period from the determined 3D position information at different acquisition time instants;
• and
• using the ascertained motion information for motion correction of the 3D image dataset.