X-ray or gamma ray systems or devices – Specific application – Radiation coding
Patent
1994-02-14
1995-12-05
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Radiation coding
378 23, G01N 2300
Patent
active
054736536
ABSTRACT:
The invention relates to a method of generating slice images of an examination zone which is irradiated by X-rays from a plurality of radiation source positions in order to generate separate single images, each associated with a difficult one of the source position for each single image there being stored image values which correspond to the absorption in its image points, slice images being generated in that slice image values are derived from the image values of the image points of the single images which are geometrically associated with a slice image point. This may give rise to contrast reversal and pseudo-resolution effects. These effects are eliminated in that the slice image values are derived by a weighted summing operation where the weighting factor applied to the image values of the single images enter the summing operation decreases as the distance between the radiation source position associated with the single image a central radiation source position increases.
REFERENCES:
patent: 3499146 (1970-03-01), Richards
patent: 5022066 (1991-06-01), Haaber et al.
"Optimum Spread Functions In Linear Tomography" G. Harding, Phys. Med. Biol. 1975, vol. 20, No. 1, pp. 144-149.
"A Method For Improving The Transfer Function Of Linear Tomographic Systems" Phys. Med. Biol. 1977, vol. 22, No. 4, pp. 747-759.
Church Craig E.
Slobod Jack D.
U.S. Philips Corporation
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