Method for image reconstruction in a computed tomography apparat

Details Method for image reconstruction in a computed tomography apparat Method for image reconstruction in a computed tomography apparat

1997-05-02

1998-08-18

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

057968039

ABSTRACT:
In an approximative image reconstruction method for a computed tomography apparatus with a multi-row detector in spiral operation, a reinterpolation from fan data to parallel data (rebinning) is first carried out independently for all rows of the detector. With the parallel data, an image is reconstructed by having each beam contribute to the image with a weight that depends on the respective distance of the beam to the image plane. Each beam thereby receives a weight that, in general, changes along the beam. By approximating these weighting functions by a short Fourier series, an efficient Fourier reconstruction results.

REFERENCES:
patent: 4991093 (1991-02-01), Roberge et al.
patent: 5406479 (1995-04-01), Harman
patent: 5625660 (1997-04-01), Tuy
"The Gridding Method For Image Reconstruction By Fourier Transformation, " Schomberg et al, IEEE Trans. On Med. Imaging, vol. 14, No. E, Sep. 1995, pp. 596-607.

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