Correction for polychromatic X-ray distortion in CT images

Details Correction for polychromatic X-ray distortion in CT images Correction for polychromatic X-ray distortion in CT images

1978-04-28

1980-08-12

Krass, Errol A.

Boots, shoes, and leggings

250445T, 358166, 364515, 364571, G01N 2300, G01T 116

Patent

active

042176417

ABSTRACT:
A method and apparatus which corrects the polychromatic distortion of CT images which is produced by the non-linear interaction of body constituents with a polychromatic X-ray beam. A CT image is processed to estimate the proportion of the attenuation coefficients of the constituents in each pixel element. A multiplicity of projections for each constituent are generated from the original image and are combined utilizing a multidimensional polynomial which approximates the non-linear interaction involved. An error image is then generated from the combined projections and is subtracted from the original image to correct for the poloychromatic distortion.

REFERENCES:
patent: 3927318 (1975-12-01), Macovski
patent: 3944830 (1976-03-01), Dissing
patent: 3965358 (1976-06-01), Macovski
patent: 4029963 (1977-06-01), Alvarez et al.
patent: 4063074 (1977-12-01), Wagner
patent: 4069422 (1978-01-01), Hounsfield

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