G - Physics – 06 – T
Patent
G - Physics
06
T
G06T 5/00 (2006.01) A61B 8/13 (2006.01) G06F 17/00 (2006.01) G06F 17/12 (2006.01) G06F 19/00 (2006.01) G06T 11/00 (2006.01)
Patent
CA 2324832
The present invention discloses a method and a system for real- time reconstruction of tomographic images from projection data-generated by computed tomography scanners. The method is based on the theory of pseudo- inverse matrices applied to tomographic image reconstruction, and it allows immediate, projection-by-projection or event-by-event updating of the reconstructed tomographic image at the moment the measuring instrument supplies additional individual projection data. The data processing involves simple arithmetic, which can be implemented into general-purpose computers in the first case, and dedicated programmable logic or application specific circuits in the second case. Models of the underlying physical processes, such as the photon emission and detection processes or the spatially variant system response, can be easily included into image reconstruction through the system matrix. Corrections for other physical and instrumental factors affecting the accuracy of projection data, such as attenuation in the body or detector efficiency normalization, can be merged with the system matrix beforehand or be performed "on the fly" by simple multiplication of the matrix elements. Real- time updating of the reconstructed tomographic image can be performed as soon as measured projection data become available. No storage of the measured raw data in the form of list mode events or sinogram is required, and the user of the tomographic system may choose to store reconstructed images only, thus achieving optimum compression of the tomographic data.
Lecomte Roger
Leger Germain
Selivanov Vitali
Goudreau Gage Dubuc
Lecomte Roger
Leger Germain
Selivanov Vitali
Universite de Sherbrooke
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