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A study of reconstruction artifacts in cone beam tomography using filtered backprojection and iterative EM algorithms

Conference · · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA)
OSTI ID:6450611
;  [1]
  1. Utah Univ., Salt Lake City, UT (USA). Dept. of Radiology
+ Show Author Affiliations

Reconstruction artifacts in cone beam tomography are studied for filtered backprojection (Feldkamp) and iterative EM algorithms. The filtered backprojection algorithm uses a voxel-driven, interpolated backprojection to reconstruct the cone beam data; whereas, the iterative EM algorithm performs ray-driven projection and backprojection operations for each iteration. Two weight in schemes for the projection and backprojection operations in the EM algorithm are studied. One weights each voxel by the length of the ray through the voxel and the other equates the value of a voxel to the functional value of the midpoint of the line intersecting the voxel, which is obtained by interpolating between eight neighboring voxels. Cone beam reconstruction artifacts such as rings, bright vertical extremities, and slice-to slice cross talk are not found with parallel beam and fan beam geometries.

OSTI ID:
6450611
Report Number(s):
CONF-900143--
Journal Information:
IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA) Vol. 37:2; ISSN 0018-9499; ISSN IETNA
Country of Publication:
United States
Language:
English

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Related Subjects

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ALGORITHMS
BACKSCATTERING
BEAM OPTICS
BEAM SHAPING
CONES
DIAGNOSTIC TECHNIQUES
IMAGE PROCESSING
IMAGE SCANNERS
ITERATIVE METHODS
MATHEMATICAL LOGIC
PROCESSING
SCATTERING
TOMOGRAPHY