Computer tomography (ct) c-arm system and method for examination of an object

A method for artefact correction of a 3D data volume of Computer Tomography (CT) slices of an examined object;

• wherein each CT slice is scanned by a CT C-arm system at a different angle around an axis through the object in an angular range of 180° or less;
• wherein the method comprising the steps:
• acquiring a first 3D data volume of the object using first scan parameters;
• adjusting the first data volume to a second data volume (segmented volume) such that voxel values of the first data volume of at least one predefined range of Hounsfield (H) are set to an at least one predefined H-value;
• generating a forward projection of the second data volume using the first scan parameters;
• reconstructing the projection to a third data volume;
• generating a fourth data volume (artefact-only volume) by subtracting the third volume with the second volume;
• generating a fifth volume by adding the first volume with the fourth volume.

A computer-readable medium, in which a computer program for examination of an object of interest is stored which, when executed by a processor, causes the processor to carry out the steps of:

• acquiring a first 3D data volume of CT slices using first scan parameters;
• adjusting the first data volume to a second data volume (segmented volume) such that voxel values of the first data volume of at least one predefined range of Hounsfield (H) are set to an at least one predefined H-value;
• generating a forward projection of the second data volume using the first scan parameters;
• reconstructing the projection to a third data volume;
• generating a fourth data volume (artefact-only volume) by subtracting the third volume with the second volume;
• generating a fifth volume by adding the first volume with the fourth volume.

A program element for examination of an object of interest, which being executed by a processor, causes the processor to carry out the steps of:

• acquiring a first 3D data volume of CT slices using first scan parameters;
• adjusting the first data volume to a second data volume (segmented volume) such that voxel values of the first data volume of at least one predefined range of Hounsfield (H) are set to an at least one predefined H-value;
• generating a forward projection of the second data volume using the first scan parameters;
• reconstructing the projection to a third data volume;
• generating a fourth data volume (artefact-only volume) by subtracting the third volume with the second volume;
• generating a fifth volume by adding the first volume with the fourth volume.