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Tomographic imaging using poissonian detector data

United States Patent

October 15, 2013
View the Complete Patent at the US Patent & Trademark Office
An image reconstruction method for reconstructing a tomographic image (f.sub.j) of a region of investigation within an object (1), comprises the steps of providing detector data (y.sub.i) comprising Poisson random values measured at an i-th of a plurality of different positions, e.g. i=(k,l) with pixel index k on a detector device and angular index l referring to both the angular position (.alpha..sub.l) and the rotation radius (r.sub.l) of the detector device (10) relative to the object (1), providing a predetermined system matrix A.sub.ij assigning a j-th voxel of the object (1) to the i-th detector data (y.sub.i), and reconstructing the tomographic image (f.sub.j) based on the detector data (y.sub.i), said reconstructing step including a procedure of minimizing a functional F(f) depending on the detector data (y.sub.i) and the system matrix A.sub.ij and additionally including a sparse or compressive representation of the object (1) in an orthobasis T, wherein the tomographic image (f.sub.j) represents the global minimum of the functional F(f). Furthermore, an imaging method and an imaging device using the image reconstruction method are described.
Aspelmeier; Timo (Goettingen, DE), Ebel; Gernot (Goettingen, DE), Hoeschen; Christoph (Hebertshausen, DE)
Scivis wissenschaftliche Bildverarbeitung GmbH (Goettingen, DE)
12/ 990,849
January 28, 2010
ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT The work leading to this invention has received funding from the European Atomic Energy Community's Seventh Framework Programme ([FP7/2007-2011]) under grant agreement no FP7-212100.