Exact region of interest cone beam imaging using 3D backprojecti

Details Exact region of interest cone beam imaging using 3D backprojecti Exact region of interest cone beam imaging using 3D backprojecti

1998-03-31

1999-07-20

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 15, 378901, A61B 603

Patent

active

059265213

ABSTRACT:
A scanning and data acquisition method and apparatus for three dimensional (3D) computerized tomography (CT) imaging of an object, wherein a plurality of line integral derivatives for a respective plurality of line segments L formed in cone beam projection data acquired on a detector at a plurality of source positions, are calculated. The extent of line segments L in the data acquired at each of the source positions is determined by a mask formed by cone beam projections onto the plane of the detector of portions of the source scan path that are above and below the source position that acquired the cone beam data in which the line integral derivatives for line segments L are being calculated. The line integral derivatives calculated for a plurality of the line segments L are then backprojected onto a 2D space corresponding to the plane of the detector. Finally, the results of the 2D backprojecting step are 3D backprojected into a 3D space, thereby reconstructing a 3D image of the object.

REFERENCES:
patent: 5463666 (1995-10-01), Eberhard et al.
patent: 5504792 (1996-04-01), Tam
patent: 5881123 (1999-03-01), Tam
"Derivation and Implementation of a Cone-Beam Reconstruction Algorithm for Nonplanar Orbits", Kudo et al., IEEE Transactions on Medical Imaging, vol. 13, No. 1, Mar. 1994, pp. 196-211.

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