A study of reconstruction artifacts in cone beam tomography using filtered backprojection and iterative EM algorithms
- Utah Univ., Salt Lake City, UT (USA). Dept. of Radiology
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-; CODEN: IETNA; TRN: 90-033778
- Journal Information:
- IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA), Vol. 37:2; Conference: Institute for Electronic and Electrical Engineers (IEEE) nuclear science symposium, San Francisco, CA (USA), 15-19 Jan 1990; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
IMAGE SCANNERS
BEAM OPTICS
TOMOGRAPHY
IMAGE PROCESSING
ALGORITHMS
BACKSCATTERING
BEAM SHAPING
CONES
ITERATIVE METHODS
DIAGNOSTIC TECHNIQUES
MATHEMATICAL LOGIC
PROCESSING
SCATTERING
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990200 - Mathematics & Computers
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