Contrast-enhanced imaging of objects
A contrast-enhanced imaging of an object is performed by an imaging device having a movable radiation source. A first projection image sequence of the object along a first trajectory over which the radiation source moves is recorded by radiation having a first energy spectrum. Subsequently, a second projection image sequence of the object along a second trajectory over which the radiation source moves is recorded by radiation having a second energy spectrum. A reconstruction of a three-dimensional subtraction image in relation to the different energy spectra is carried out by the first and second projection image sequence. In addition, a two-dimensional subtraction image in relation to the different energy spectra is reconstructed with the aid of the first and second projection image sequence. In this way, apart from a three-dimensional subtraction image, a two-dimensional subtraction image is also provided for better analysis of object characteristics.
1. A method for contrast-enhanced imaging of an object by an imaging device having a movable x-ray radiation source, which comprises the steps of:
recording a first projection image sequence of the object along a first trajectory over which the movable x-ray radiation source moves, with a detector detecting x-ray radiation having a first energy spectrum;
recording a second projection image sequence of the object along a second trajectory over which the movable x-ray radiation source moves, with the detector detecting x-ray radiation having a second energy spectrum, the first and second energy spectra being different energy spectra;
reconstructing a three-dimensional subtraction image in relation to the different energy spectra using the first and second projection image sequences;
reconstructing at least one two-dimensional subtraction image in relation to the different energy spectra by forward projection of the three-dimensional subtraction image; and
providing the three-dimensional subtraction image together with the at least one two-dimensional subtraction image for an analysis of object characteristics.
2. The method according to claim 1 , which further comprises:
providing an organism as the object; and
recording one of the first or second projection image sequences after administration of a contrast medium.
3. The method according to claim 1 , wherein:
a shape of the first and second trajectories can be described with an aid of an angle; and
in the reconstruction of the two-dimensional subtraction image, an angle-dependent weighting is carried out.
4. The method according to claim 1 , which further comprises reconstructing a plurality of two-dimensional subtraction images from different directions.
5. The method according to claim 1 , which further comprises generating the different energy spectra using different x-ray radiation filters or different x-ray radiation source control parameters.
6. The method according to claim 1 , which further comprises carrying out weighting or filtration of image projections recorded with energy spectra containing higher energies.
7. The method according to claim 1 , wherein:
the method is used in a context of a mammographic examination; and
the at least one two-dimensional subtraction image corresponds to a craniocaudal recording or a mediolateral oblique recording.
8. The method according to claim 1 , which further comprises using the method for examining a stomach, lungs or esophagus.
9. A device for contrast-enhanced imaging of an object, the device comprising:
an imaging device having an x-ray radiation source-radiation detector pair with an x-ray radiation source assigned to a radiation detector, the x-ray radiation source movable along trajectories around the object, said imaging device configured to record projection image sequences of the object along the trajectories over which said x-ray radiation source moves using x-ray radiation having an adjustable energy spectrum;
a first computer unit for reconstructing a three-dimensional subtraction image in relation to different energy spectra using different projection image sequences;
a second computer unit for constructing two-dimensional subtraction images in relation to the different energy spectra by forward projection of the three-dimensional subtraction image; and
a display unit for providing the three-dimensional subtraction image together with the two-dimensional subtraction image for an analysis of object characteristics.
10. The device according to claim 9 , wherein the different energy spectra are set using at least one of different x-ray radiation filters or different x-ray radiation source control parameters.