Method and system for reconstruction algorithm in cone beam CT with differentiation in one direction on detector
AssigneesKabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
InventorYu Zou
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Abstract
The current invention is generally related to a data acquisition and or image processing method and system for acquiring and or processing sparse channel data. The sparse channel is implemented in a data acquisition system having a predetermined wider pitch between the adjacent detector cells than that in the currently available imaging systems at least in one predetermined direction. In one implementation, the sparse channel data is acquired by the sparse channel data acquisition system, and an image is reconstructed from the sparse channel data according to a predetermined chord based reconstruction method eliminating the differentiation along the channel direction and utilizing a pair of proper weights.
Claims14
A method of reconstructing an image in cone beam CT, comprising:
- acquiring projection data at a detector while scanning an object in a predetermined manner;
- selecting one of a predetermined set of directions, the selected direction being the least sampled direction;
- obtaining derivatives along the directions in the projections data except for the selected direction;
- determining proper weights corresponding to the derivatives;
- obtaining weighted derivatives based upon the derivatives and the proper weights;
- combining the projection data and the weighted derivatives to generate combination data;
- and
- backprojecting the combination data.
A system for reconstructing an image in cone beam CT, comprising:
- a data acquisition unit for acquiring projection data at a detector while scanning an object in a predetermined manner;
- and
- a reconstruction device connected to said data acquisition unit for selecting one of a predetermined set of directions, the selected direction being the least sampled direction, said reconstruction device obtaining derivatives along the directions in the projections data except for the selected direction, said reconstruction device determining proper weights corresponding to the derivatives, said reconstruction device obtaining weighted derivatives based upon the derivatives and the proper weights, said reconstruction device combining the projection data and the weighted derivatives to generate combination data, said reconstruction device backprojecting the combination data.
Dependencies are inferred from the claim text.