Method and apparatus for X-ray computed tomography

Details Method and apparatus for X-ray computed tomography Method and apparatus for X-ray computed tomography

1996-01-19

1997-06-17

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

056404360

ABSTRACT:
A method for X-ray computed tomography includes a process for rotating around an object an X-ray source for applying a cone-beam X ray and a scanner having a two-dimensional X-ray detector mounted thereon for deriving projection data and a process for preparing a geometric distortion correction table for correcting an image geometric distortion of the two-dimensional X-ray detector for the projection data, for reconstructing a distribution of X-ray attenuation coefficients of the object from said corrected projection data. The method further includes a process for calculating a function for evaluating the correction table, a process for comparing the calculated value with a threshold value, a process for correcting the correction table through the interpolation based on the compared result, a process for correcting an image geometric distortion of the projection data by using the corrected table, a process for detecting a location of a view field boundary of the detector from the distortion-corrected projection data, and a process for generating the projection data of a predetermined width from the detected location of the view field boundary through the effect of the extrapolation. The method operates to reconstruct a distribution of X-ray attenuation coefficients of the object from the extrapolated projection data.

REFERENCES:
patent: 5493593 (1996-02-01), Muller et al.
SPIE Vol.2163, Physics of Medical Imaging, pp.199-210, 1994.
JP-A-5-28316(U) Japan Filing Date Sep. 27, 1991 Translation Not avail.
J.Opt.Soc.Am. A/vol.1, No.6, Jun. 1984, pp.612-619.
Medical Physics, vol.6, No.5, pp.412-417, 1979.

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