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US 12,718,441 B2Granted
Method for use in CT reconstruction
AssigneeKoninklijke Philips N.V.
InventorThomas Koehler
Life of this patent
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Abstract
A method of preprocessing cone beam projection data acquired using a dual x-ray focal spot acquisition approach in which projection data is acquired over a series of angular positions of the CT scanner about a body, and wherein at least two angularly displaced x-ray sources (focal spots) are alternately activated as the scanner rotates orbitally around the body. The pre-processing involves a resampling of the projection data from the first and second focal spots to a new virtual sampling point part way between the first and second focal spots.
Claims10
A method for reconstructing computed tomography (CT) projection data, comprising:
- receiving the CT projection data of a body, wherein the CT projection data comprises at least first and second x-ray detector measurement data corresponding to measurement data acquired with an x-ray generator providing alternately activated first and second x-ray point sources displaced relative to one another along an orbital rotational axis of the x-ray generator about the body, the x-ray sources generating respective x-ray cone beams, and wherein each of the first and second measurement data comprises measurement data for a series of orbital rotational positions of the generator about the body;
- processing the first and second measurement data with a re-sampling operation comprising angular interpolation along the orbital rotational axis about the body to derive a third set of measurement data representing projection data of a single virtual cone beam propagated from a virtual single x-ray point source located at a mid-point between the first and second x-ray point source locations, along the orbital rotational axis, the virtual single x-ray point source having a plurality of orbital angular sampling positions about the body, and the third set of measurement data being based on the first and second measurement data;
- and
- applying a reconstruction algorithm to the third set of measurement data.
1 more element
An x-ray computed tomography (CT) imaging system, comprising:
- an x-ray CT imaging apparatus comprising an x-ray generator and an x-ray detector, the x-ray detector and x-ray generator mounted on a rotatable gantry permitting orbital angular rotation of the detector and generator around an examination region, wherein the x-ray generator is configured to alternately activate first and second x-ray point sources displaced relative to one another along an orbital rotational axis, and the first and second x-ray sources generating respective x-ray cone beams, wherein the x-ray detector comprises a 2D detector array;
- and
- at least one processor configured to:
- obtain from the x-ray detector first and second x-ray detector measurement data corresponding to respective measurement data acquired with the alternately activated first and second x-ray point sources, the first and second measurement data each comprising measurement data for a series of orbital rotational positions of the x-ray generator about the body,
- process the first and second measurement data with a re-sampling operation comprising angular interpolation along the orbital rotational axis about the body to derive a third set of measurement data representing projection data for a single virtual cone beam propagated from a virtual single x-ray point source located at a mid-point between the first and second x-ray point source locations, along the orbital rotational axis, the single point source having a plurality of orbital angular sampling positions about the body, the third set of measurement data based on a combination of the first and second measurement data, and
- apply a reconstruction algorithm to the third set of measurement data.
3 more elements
A non-transitory computer-readable medium for storing executable instructions, which cause a method to be performed to reconstruct computed tomography (CT) projection data, the method comprising:
- receiving the CT projection data of a body, wherein the CT projection data comprises at least first and second x-ray detector measurement data corresponding to measurement data acquired with an x-ray generator providing alternately activated first and second x-ray point sources displaced relative to one another along an orbital rotational axis of the x-ray generator about the body, the x-ray sources generating respective x-ray cone beams, and wherein each of the first and second measurement data comprises measurement data for a series of orbital rotational positions of the generator about the body;
- processing the first and second measurement data with a re-sampling operation comprising angular interpolation along the orbital rotational axis about the body to derive a third set of measurement data representing projection data of a single virtual cone beam propagated from a virtual single x-ray point source located at a mid-point between the first and second x-ray point source locations, along the orbital rotational axis, the virtual single x-ray point source having a plurality of orbital angular sampling positions about the body, and the third set of measurement data being based on the first and second measurement data;
- and
- applying a reconstruction algorithm to the third set of measurement data.
1 more element
Dependencies are inferred from the claim text.