System and method for cone beam volume computed tomography using circle-plus-multiple-arc orbit
AssigneeUniversity of Rochester
InventorRuola Ning
Life of this patent
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Abstract
Cone beam volume computed tomography (CBVCT) is carried out by taking signals along an orbit having a circle plus two or more arcs. A reconstruction algorithm is provided to add a correction term to the Feldkamp algorithm and to use the arc data to reconstruct data which cannot be recovered from the circle scan. The part of the reconstruction algorithm for the circle orbit uses filtering functions to simplify digital signal processing. The part of the reconstruction algorithm for the arc orbits uses a window function to resolve data redundancy.
Claims42
A method of imaging an object to form a reconstructed image, the method comprising:
- (a) scanning the object using a source of radiation and a detector of the radiation, the source and the detector being moved around the object to define an orbit comprising (i) a circle orbit for providing a first set of data signals and (ii) a plurality of arc orbits for providing a second set of data signals;
- (b) performing a first reconstruction from the first set of data signals to generate a first reconstruction result;
- (c) performing a second reconstruction from the second set of data signals to generate a second reconstruction result;
- and
- (d) summing the first reconstruction result and the second reconstruction result to obtain the reconstructed image as a sum of the first reconstruction result and the second reconstruction result.
A device for imaging an object to form a reconstructed image, the device comprising:
- a source of radiation;
- a detector of the radiation;
- a gantry for supporting the source and the detector and for moving the source and the detector around the object to define an orbit comprising (i) a circle orbit for providing a first set of data signals and (ii) a plurality of arc orbits for providing a second set of data signals;
- and
- a computing device, receiving the first and second sets of data signals, for (i) performing a first reconstruction from the first set of data signals to generate a first reconstruction result, (ii) performing a second reconstruction from the second set of data signals to generate a second reconstruction result and (iii) summing the first reconstruction result and the second reconstruction result to obtain the reconstructed image as a sum of the first reconstruction result and the second reconstruction result.
Dependencies are inferred from the claim text.