Image analysis – Applications – Biomedical applications
Patent
1995-09-25
1997-12-23
Boudreau, Leo
Image analysis
Applications
Biomedical applications
382132, 36441315, 3644132, 378 4, G06K 900
Patent
active
057013608
ABSTRACT:
A computer tomography apparatus, wherein data obtained from radiation penetrating an examination subject are present in parallel beam geometry, undertakes a Fourier reconstruction of computer tomography images which represent a selectable region of the examination subject. The reconstruction is undertaken by extending and modifying a known gridding techniqud for Fourier reconstruction of computer tomography images. Values on a rectangular grid with grid dimension .eta. in the frequency domain are obtained by weighting the values on the polar grid with a function G. The grid dimension .eta. in the frequency space may be arbitrarily chosen for generating an excerpt .vertline.x-x.sub.0 .vertline..ltoreq.L=1/2.eta. and .vertline.y-y.sub.0 .vertline..ltoreq.L=1/2.eta. of the examination volume. The spectral values on the rectangular grid are periodically repeated in Cartesian Coordinates with a period length M/L, wherein L is the sidelength of the image field and M.multidot.M is the number of picture elements, resulting in a plurality of contributions falling into the basic period. A two-dimensional Fourier transform of the spectrum in Cartesian Coordinates back to the spatial domain is applied to the basic period to produce the image.
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Boudreau Leo
Shawala Bipin
Siemens Aktiengesellschaft
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