| US 7,539,281 B2 | ||
| Methods and apparatus for reconstruction in helical cone beam volumetric CT | ||
| Xiangyang Tang, Waukesha, Wis. (US); Jiang Hsieh, Brookfield, Wis. (US); and Roy Arnulf Helge Nilsen, Mcnomonee Falls, Wis. (US) | ||
| Assigned to General Electric Company, Schenectady, N.Y. (US) | ||
| Filed on Oct. 15, 2004, as Appl. No. 10/966,881. | ||
| Prior Publication US 2006/0083344 A1, Apr. 20, 2006 | ||
| Int. Cl. A61B 6/03 (2006.01) | ||
| U.S. Cl. 378—15 [378/4; 378/901] | 20 Claims |
| 1. A mathematically exact method for reconstructing an image of an object utilizing a cone-beam volumetric computed tomographic
imaging apparatus, said method comprising:
helically scanning the object with a radiation source utilizing the cone-beam volumetric computed tomographic imaging apparatus;
selecting radiation beams emitted by the radiation source passing through a pixel P, a Tam-window, and a Katsevich window;
filtering the selected projection data using a 2π interval for each pixel that is to be reconstructed;
reconstructing an image of the object utilizing the filtered selected projection data including projection data within the
Katsevich window and outside the Tam-window;
outputting the reconstructed image.
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