Method for determining a three-dimensional reconstruction of an examination object

A non-transitory computer program executed on a computer for determining a three-dimensional reconstruction of an examination object, comprising:

• a subroutine that:
• determines a provisional three-dimensional reconstruction of the examination object based on a plurality of two-dimensional original projection images of the examination object;
• segments the provisional three-dimensional reconstruction to determined a provisional metal volume;
• maps the provisional metal volume into the original projection images to create a plurality of corresponding provisional metal areas;
• defines edge zones of the provisional metal areas in the original projection images;
• selects edge points from the edge zones;
• determines modified projection images by modifying data values of the original projection images assigned to locations in the provisional metal areas as a function of data values of the selected edge points;
• calculates differential images based on the original projection images and the corresponding modified projection images;
• segments the differential images to determine definitive metal areas;
• subtracts the definitive metal areas from the differential images;
• and
• determines the three-dimensional reconstruction by adding the subtracted differential images to the corresponding modified projection images.

A medical device for determining a three-dimensional reconstruction of an examination object, comprising:

• an image device that records a plurality of two-dimensional original projection images of the examination object;
• and
• a computer that:
• determines a provisional three-dimensional reconstruction of the examination object based on the two-dimensional original projection images;
• segments the provisional three-dimensional reconstruction to determined a provisional metal volume;
• maps the provisional metal volume into the original projection images to create a plurality of corresponding provisional metal areas;
• defines edge zones of the provisional metal areas in the original projection images;
• selects edge points from the edge zones;
• determines modified projection images by modifying data values of the original projection images assigned to locations in the provisional metal areas as a function of data values of the selected edge points;
• calculates differential images based on the original projection images and the corresponding modified projection images;
• segments the differential images to determine definitive metal areas;
• subtracts the definitive metal areas from the differential images;
• and
• determines the three-dimensional reconstruction by adding the subtracted differential images to the corresponding modified projection.