Motion compensated reconstruction technique
AssigneeKoninklijke Philips Electronics N.V.
InventorThomas Koehler
Life of this patent
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Abstract
The long scan time in PET imaging may lead to a significant loss of resolution, due to patient or organ motion. According to the present invention, the distortion or motion may be compensated by performing a forward-projection, and/or back-projection of the intermediate image on the basis of a motion field describing a motion and/or distortion of the object of interest.
Claims9
A method of reconstructing an image from measured line-integrals of an object, the method comprising the steps of:
- binning of the measured line-integrals into a plurality of temporal bins;
- determining a plurality of motion fields for the plurality of temporal bins;
- selecting first data from a selected bin of the plurality of temporal bins;
- forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin;
- determining a difference between the first data and the second data;
- up-dating the intermediate image on the basis of the difference.
An image processing device for reconstructing an image from measured line-integrals, comprising:
- a storage for storing the positron emission data;
- and an image processor for reconstructing the image from the measured line-integrals;
- wherein the image processor is adapted to performs the following operation:
- binning of the measured line-integrals into a plurality of temporal bins;
- determining a plurality of motion fields for the plurality of temporal bins;
- selecting first data from a selected bin of the plurality of temporal bins;
- forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin;
- determining a difference between the first data and the second data;
- and up-dating the intermediate image on the basis of the difference.
A positron emission tomography system, wherein the positron emission tomography system includes a storage for storing measured line-integrals and an image processor, wherein the image processor performs the following operation:
- binning of the measured line-integrals into a plurality of temporal bins;
- determining a plurality of motion fields for the plurality of temporal bins;
- selecting first data from a selected bin of the plurality of temporal bins;
- forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin;
- determining a difference between the first data and the second data;
- up-dating the intermediate image on the basis of the difference.
A computer program stored on a computer readable medium comprising computer program means to cause a processor to execute the following steps when the computer program means are executed on the processor:
- binning of the measured line-integrals into a plurality of temporal bins;
- determining a plurality of motion fields for the plurality of temporal bins;
- selecting first data from a selected bin of the plurality of temporal bins;
- forward-projecting an intermediate image for forming second data by using a motion field of the plurality of motion fields that belongs to the selected temporal bin;
- determining a difference between the first data and the second data;
- up-dating the intermediate image on the basis of the difference.
Dependencies are inferred from the claim text.