Phase contrast cone-beam ct imaging

G - Physics – 01 – N

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G01N 23/00 (2006.01) G01N 23/04 (2006.01) G01N 23/20 (2006.01) G01N 23/201 (2006.01) G01T 1/36 (2006.01) G03H 5/00 (2006.01)

Patent

CA 2643894

A cone beam CT imaging system incorporates the phase contrast in-line method, in which the phase coefficient rather than only the attenuation coefficient is used to reconstruct the image. Starting from the interference formula of in-line holography, the terms in the interference formula can be approximately expressed as a line integral that is the requirement for all CBCT algorithms. So, the CBCT reconstruction algorithms, such as the FDK algorithm, can be applied for the in-line holographic projections.

L'invention concerne un système de tomographie par ordinateur à faisceau conique qui intègre la méthode en ligne à contraste de phase. Ce système n'utilise pas le seul coefficient d'atténuation mais plutôt le coefficient de phase pour reconstruire l'image. En partant de la formule d'interférence d'holographie en ligne, les termes de la formule d'interférence peuvent être exprimés approximativement sous forme d'une intégrale de ligne, ce qui est requis pour tous les algorithmes de tomographie par ordinateur à faisceau conique. Ainsi, les algorithmes de reconstruction de tomographie par ordinateur à faisceau conique, tels que l'algorithme FDK, peuvent être appliqués pour les projections holographiques en ligne.

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