Computed tomography apparatus and program
First Claim
1. A computed tomography apparatus comprising:
- a data acquisition unit configured to acquire projection data of a radiographic region within a subject using a multirow detector; and
an image reconstruction unit configured to reconstruct an image of the radiographic region on the basis of both two-dimensional projection data which are extracted from the projection data acquired by said data acquisition unit, and additional two-dimensional data which are extracted from three-dimensional data calculated on the basis of three-dimensional partial data extracted from the projection data acquired by said data acquisition unit.
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Accused Products
Abstract
A computed tomography apparatus includes a two-dimensional data acquisition system which acquires projection data of a radiographic region within a subject using a multirow detector, and a hybrid image reconstruction system which reconstructs an image of the radiographic region on the basis of both the projection data and additional data calculated from the projection data. The hybrid image reconstruction system functionally includes a unit for calculating an additional intermediate beam data set, a unit for executing hybrid reconstruction of an oblique section, and a unit for generating a parallel section group. Owing to the construction, there are provided an image reconstruction method which is practicable and which affords a high precision, and a three-dimensional CT system which has the functions of the image reconstruction method.
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Citations
22 Claims
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1. A computed tomography apparatus comprising:
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a data acquisition unit configured to acquire projection data of a radiographic region within a subject using a multirow detector; and an image reconstruction unit configured to reconstruct an image of the radiographic region on the basis of both two-dimensional projection data which are extracted from the projection data acquired by said data acquisition unit, and additional two-dimensional data which are extracted from three-dimensional data calculated on the basis of three-dimensional partial data extracted from the projection data acquired by said data acquisition unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computed tomography apparatus comprising:
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a data acquisition unit configured to acquire projection data of a radiographic region within a subject using a multirow detector; and an image reconstruction unit configured to extract from the projection data, approximate projection data of X-ray paths that approximate a reconstruction plane not being always orthogonal to a rotational center axis of the multirow detector, and to reconstruct an image of the radiographic region on the basis of the approximate projection data; wherein said image reconstruction unit selects approximate fan beams or approximate parallel beams every point of the reconstruction plane, and reconstructs the image of the radiographic region using approximate beams. - View Dependent Claims (12, 13, 14, 15)
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16. A computed tomography apparatus comprising:
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a data acquisition unit configured to acquire projection data of a radiographic region within a subject; and an image reconstruction unit configured to reconstruct a two-dimensional reconstruction image of the radiographic region on the basis of both fan beam data which are the projection data acquired by said data acquisition unit, and parallel beam data which are calculated from the fan beam data. - View Dependent Claims (17, 18, 19)
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20. A program which causes a computer mounted on a computed tomography apparatus, to execute:
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a step of extracting two-dimensional projection data from projection data of a radiographic region within a subject as acquired using a multirow detector; a step of extracting three-dimensional data on the basis of three-dimensional partial data extracted from the acquired projection data; a step of extracting two-dimensional data from the three-dimensional data; and a step of reconstructing an image of the radiographic region on the basis of both the two-dimensional projection data and the two-dimensional extracted data.
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21. A program which causes a computer mounted on a computed tomography apparatus, to execute:
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a step of extracting from projection data of a radiographic region within a subject as acquired using a multirow detector, approximate projection data of X-ray paths which approximate a reconstruction plane not being always orthogonal to a rotational center axis of the multirow detector; and a step of reconstructing an image of the radiographic region on the basis of the approximate projection data; wherein the reconstructing step selects approximate fan beams or approximate parallel beams every point of the reconstruction plane, and reconstructs the image of the radiographic region using the approximate beams.
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22. A program which causes a computer mounted on a computed tomography apparatus, to execute:
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a step of calculating parallel beam data from fan beam data which are projection data of a radiographic region within a subject; and a step of reconstructing a two-dimensional image of the radiographic region on the basis of both the fan beam data and the parallel beam data.
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Specification