Practical cone beam image reconstruction using local regions-of-

Details Practical cone beam image reconstruction using local regions-of- Practical cone beam image reconstruction using local regions-of-

1998-03-31

1999-12-28

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 4, 378901, A61B 603

Patent

active

060091428

ABSTRACT:
A method and apparatus of operating a CT imaging apparatus having a cone beam radiation source and a 2D detector arrangement, for exactly reconstructing an image of a 3D region of interest (ROI) in an object. Measurement data acquired by the 2D detector is processed to develop sub-sets of Radon data. Each of the sub-sets of Radon data is targeted for reconstructing a corresponding local 2D ROI in a 2D parallel projection of the object. Accordingly, after a sub-set of Radon data is completely developed, it is subjected to a first inversion processing step for developing the corresponding local 2D ROI. Multiple ones of the local ROIs are then grouped together and subjected to a second inversion processing step to develop an image reconstruction of a part of the 3D ROI in the object.

REFERENCES:
patent: 5257183 (1993-10-01), Tam
U.S. Patent Application No. 08/940,489 filed Sep. 30, 1997 to Sauer et al. entitled "A Reduction of Hitlist Size in Spiral Cone Beam CT by Use of Local Radon Origins".

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