Method and imaging device for generating a motion-compensated image, computer program, and storage medium

A data processing facility for generating a motion-compensated image of a target object from a plurality of projection images of the target object, wherein the data processing facility is configured to automatically:

• acquire the plurality of projection images of the target object, the plurality of projection images being recorded during a motion of at least one part of the target object, wherein the motion has a main point;
• generate a reference image of the target object from the plurality of projection images without using a synchronization signal that characterizes the motion of the target object;
• and
• iteratively determine, from the plurality of projection images, a motion field that characterizes the motion of the target object, wherein the motion field comprises motion vectors for individual projection images of the plurality of projection images, with respect to the current reference image,
• wherein, in each case, after a predetermined number of iterative acts with motion compensation based on the motion field that is then current in each case, a provisional motion-compensated image of the target object is generated,
• wherein the respective existing reference image is replaced by the provisional motion-compensated image as a new current reference image,
• wherein the iterative determination of the motion field is continued using the new current reference image,
• wherein a segmentation of the plurality of projection images and/or of the images generated therefrom is carried out, that by the segmentation, static and/or non-static regions are defined and as a function thereof, the determination of the motion field and/or the use of the motion field is spatially restricted when the motion-compensated image is being generated, and
• wherein, when a predetermined termination condition for the iteration is reached, the motion-compensated image is generated from the plurality of projection images and from the last iteration of the motion field, or the last provisional motion-compensated image generated during the iteration as the motion-compensated image of the target object is issued.

An imaging device comprising:

• an acquisition facility configured to record a plurality of projection images of a target object during a motion of at least one part of the target object, the motion having a main point;
• and
• a data processing facility configured to:
• receive the plurality of projection images of the target object;
• generate a reference image of the target object from the plurality of projection images without using a synchronization signal that characterizes the motion of the target object;
• and
• iteratively determine, from the plurality of projection images, a motion field that characterizes the motion of the target object, wherein the motion field comprises motion vectors for individual projection images of the plurality of projection images, with respect to a current reference image,
• wherein, in each case, after a predetermined number of iterative acts with motion compensation based on the motion field that is then current in each case, a provisional motion-compensated image of the target object is generated,
• wherein the respective existing reference image is replaced by the provisional motion-compensated image as a new current reference image,
• wherein the iterative determination of the motion field is continued using the new current reference image,
• wherein a segmentation of the plurality of projection images and/or of the images generated therefrom is carried out, that by the segmentation, static and/or non-static regions are defined and as a function thereof, the determination of the motion field and/or the use of the motion field is spatially restricted when the motion-compensated image is being generated, and
• wherein, when a predetermined termination condition for the iteration is reached, a motion-compensated image is generated from the plurality of projection images and from the last iteration of the motion field, or the last provisional motion-compensated image generated during the iteration as the motion-compensated image of the target object is issued.

A non-transitory computer-readable storage medium on which a computer program is stored, wherein the computer program, when executed by a computer, causes a data processing device to:

• acquire a plurality of projection images of a target object, the plurality of projection images being recorded during a motion of at least one part of the target object, wherein the motion has a main point;
• generate a reference image of the target object from the plurality of projection images without using a synchronization signal that characterizes the motion of the target object;
• and
• iteratively determine, from the plurality of projection images, a motion field that characterizes the motion of the target object, wherein the motion field comprises motion vectors for individual projection images of the plurality of projection images, with respect to a current reference image,
• wherein, in each case, after a predetermined number of iterative acts with motion compensation based on the motion field that is then current in each case, a provisional motion-compensated image of the target object is generated,
• wherein the respective existing reference image is replaced by the provisional motion-compensated image as a new current reference image,
• wherein the iterative determination of the motion field is continued using the new current reference image,
• wherein a segmentation of the plurality of projection images and/or of the images generated therefrom is carried out, that by the segmentation, static and/or non-static regions are defined and as a function thereof, the determination of the motion field and/or the use of the motion field is spatially restricted when the motion-compensated image is being generated, and
• wherein, when a predetermined termination condition for the iteration is reached, a motion-compensated image is generated from the plurality of projection images and from the last iteration of the motion field, or the last provisional motion-compensated image generated during the iteration as the motion-compensated image of the target object is issued.