Method and apparatus for reconstructing volumetric images in a h

Details Method and apparatus for reconstructing volumetric images in a h Method and apparatus for reconstructing volumetric images in a h

1998-03-11

1999-09-28

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 15, 378901, A61B 603

Patent

active

059600560

ABSTRACT:
In an improved method and apparatus for cone-beam reconstruction, a helical cone-beam system is provided, operable in a half-scan configuration, offering volumetric imaging results superior to conventional scanning techniques at double the pitch. The projection data of successive rotation angles are sorted into reordered parallel projections having different spatial positions with respect to the rotating axis. The reordered projections are interpolated to generate interpolated projections having a common spatial position along the rotation axis. The interpolated projections are convolved and backprojected to provide a volumetric image of the object. The invention is applicable to a range of computed tomography applications, including medical scanning, baggage scanning, and industrial product scanning applications.

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L.A. Feldkamp, L.C. Davis, and J.W. Kress, "Practical Cone-beam Algorithm," J. Opt. Soc. Am. A, vol. 1, p. 612, No. 6, Jun. 1984.
D.L. Parker, "Optimal Short Scan Convolution Reconstruction for Fan beam CT," Med. Phys., vol. 9, No. 2, p. 254, Mar./Apr. 1982.

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