Motion artifacts compensation
AssigneeKoninklijke Philips Electronics N.V.
InventorsThomas Kohler, Roland Proksa, Claas Bontus
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Abstract
Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.
Claims12
A method of motion artifact compensation in a projection data set of an object of interest, wherein the projection data set is acquired by means of a source of electromagnetic radiation generating a beam and by means of a radiation detector detecting the beam, the method comprising the steps of:
- compensating the projection data set for a motion artifact on the basis of the difference, resulting in a motion artifact compensated projection data set;
- reconstructing the object of interest from the motion artifact compensated projection data set, resulting in a motion artifact compensated image;
- wherein a first ray and a second ray create projection data of the projection data set;
- wherein the first ray and the second ray are opposite rays passing through a single object point;
- determining a difference of the projection data of the first ray and the projection data of the second ray;
- and
- wherein the difference of the projection data of the first ray and the projection data of the second ray is due to the motion of the object of interest resulting in motion artifacts.
A data processing device comprising:
- a memory for storing a data set;
- a data processor for performing motion artifact compensation in a projection data set of an object of interest, wherein the data processor is adapted for performing the following operation:
- loading the data set acquired by means of a rotating source of electromagnetic radiation generating a beam and by means of a radiation detector detecting the beam;
- compensating the projection data set for a motion artifact on the basis of the difference, resulting in a motion artifact compensated projection data set;
- reconstructing the object of interest from the motion artifact compensated projection data set, resulting in a motion artifact compensated image;
- wherein the first ray and the second ray create projection data of the projection data set;
- wherein the first ray and the second ray are opposite rays passing through a single object point;
- determining a difference of the projection data of the first ray and the projection data of the second ray;
- and
- wherein the difference of the projection data of the first ray and the projection data of the second ray is due to the motion of the object of interest resulting in motion artifacts.
A computer program for performing motion artifact compensation in a projection data set of an object of interest, wherein the computer program causes a processor to perform the following operation when the computer program is executed on the processor:
- loading the data set acquired by means of a rotating source of electromagnetic radiation generating a beam and by means of a radiation detector detecting the beam;
- compensating the projection data set for a motion artifact on the basis of the difference, resulting in a motion artifact compensated projection data set;
- reconstructing the object of interest from the motion artifact compensated projection data set, resulting in a motion artifact compensated image;
- wherein the first ray and the second ray create projection data of the projection data set;
- determining a difference of the projection data of the first ray and the projection data of the second ray;
- and
- wherein the difference of the projection data of the first ray and the projection data of the second ray is due to the motion of the object of interest resulting in motion artifacts.
Dependencies are inferred from the claim text.