Method and apparatus for performing computed tomography

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250445T, G01N 2300

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active

042053757

ABSTRACT:
In a method and an apparatus for performing computed tomography using radiation, the apparatus includes a data selecting unit which divides into a plurality of groups and stores the projection data signals provided by a multitude of radiation beams being projected along several different directions through a slice to be imaged in a subject and penetrating the slice from the external circumference of it with each of the groups corresponding to the beams penetrating along selected directions within a specific scan sector less than 180.degree.; a Fourier transform unit for calculating sample values for the one-dimensional Fourier transform of a projection function formed by each group of said projection data signals; a function calculating unit for calculating sample values for the one-dimensional Fourier transforms as mentioned above for a plurality of projecting directions selected outside said specific scan sector; and a reconstruction unit for calculating the absorption coefficient distribution of the radiation beams in said slice from both said sets of sample values, and a display unit.

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G. N. Ramachandran, "Three-Dimensional Reconstruction from Radiographs and Electron Micrographs: Application of Convolutions Instead of Fourier Transforms", Proc. Nat. Acad. Sci., vol. 68, No. 9, pp. 2236-2240, Sep. 1971.

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