Method and apparatus for performing computed tomography
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*; 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.
- Assignee:
- Tokyo Shibaura Electric Co Ltd (Japan)
- Patent Number(s):
- US 4205375
- OSTI ID:
- 5391342
- Resource Relation:
- Patent Priority Date: Priority date 31 Jan 1977, Japan; Other Information: PAT-APPL-874065
- Country of Publication:
- United States
- Language:
- English
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