Motion compensation
AssigneeKoninklijke Philips Electronics N.V.
InventorsThomas Kohler, Michael Grass, Tim Nielsen, Peter Koken
Life of this patent
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Abstract
Using only projection data in one temporal gating window around a certain target phase point may lead to motion artifacts such as blurred images. By using projection data corresponding to three temporal gating windows, which are slightly shifted with respect to each other but at least partially overlap, motion within the gating window may be estimated and, according to an exemplary embodiment of the present invention, this estimation may be used for improving the image quality. Advantageously, only the projection data inside the at least partially overlapping gating windows are used for reconstruction and motion compensation.
Claims12
A method of motion compensation in a projection data set of an object of interest, the method comprising the steps of:
- selecting a plurality of gating windows, the plurality of gating windows comprising a first gating window comprising first projection data and a second gating window comprising second projection data;
- estimating a motion of the object of interest on the basis of the projection data of the first and the second gating windows;
- performing a motion compensated reconstruction on the basis of the motion estimation;
- wherein the first and second gating windows at least partially overlap on a time axis.
A data processing device, comprising:
- a memory for storing a data set;
- a data processor for performing motion compensation in a projection data set of an object of interest, wherein the data processor is adapted for performing the following operation:
- loading the projection data set;
- selecting a first gating window comprising first projection data and a second gating window comprising second projection data;
- estimating a motion of the object of interest on the basis of the projection data of the first and second gating windows;
- performing a motion compensated reconstruction on the basis of the motion estimation;
- wherein the first and second gating windows at least partially overlap on a time axis.
A CT scanner system, comprising:
- a memory for storing a data set;
- a data processor for performing motion compensation in a projection data set of an object of interest, wherein the data processor is adapted for performing the following operation:
- loading the projection 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;
- selecting a first gating window comprising first projection data and a second gating window comprising second projection data;
- estimating a motion of the object of interest on the basis of the projection data of the first and second gating windows;
- performing a motion compensated reconstruction on the basis of the motion estimation;
- wherein the first and second gating windows at least partially overlap on a time axis.
A computer program for performing motion 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 projection data set;
- selecting a plurality of gating windows, the plurality of gating windows comprising a first gating window comprising first projection data and a second gating window comprising second projection data;
- estimating a motion of the object of interest on the basis of the projection data of the first and the second gating windows;
- performing a motion compensated reconstruction on the basis of the motion estimation;
- wherein the first and second gating windows at least partially overlap on a time axis.
Dependencies are inferred from the claim text.