US 6,983,034 B2
Methods and devices for CT reconstruction using a grangeat approach
Ge Wang, Iowa City, Iowa (US); and Seung Wook Lee, Daejeon (Korea, Republic of)
Assigned to University of Iowa Research Foundation, Iowa City, Iowa (US)
Filed on Feb. 17, 2004, as Appl. No. 10/780,916.
Claims priority of provisional application 60/447580, filed on Feb. 14, 2003.
Prior Publication US 2004/0240604 A1, Dec. 02, 2004
Int. Cl. A61B 6/00 (2006.01)
U.S. Cl. 378—4 30 Claims
OG exemplary drawing
 
1. A method for reconstructing an image of an object in a three-dimensional coordinate system with an x-ray computed tomography system, the method comprising the steps of:
conducting a partial scan of the object by rotating an x-ray beam having a cone beam geometry around a portion of the object or rotating the object in the x-ray beam, the x-ray beam forming a scanning trajectory through a plurality of projection lines from a plurality of successive focal point locations;
detecting the x-ray beam, attenuated by the object during the scan, to produce detector values;
integrating the detector values along the projection lines to obtain intermediate data; and
calculating three-dimensional Radon values representing substantially accurate or approximate plane integrals of the object from the intermediate data using a Grangeat relationship.