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
- 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--
- Conference Information:
- Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA) Journal Volume: 37:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
07 ISOTOPE AND RADIATION SOURCES
440100 -- Radiation Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602 -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
655002* -- Medical Physics-- Radiation Source Calibration & Standardization
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
BACKSCATTERING
BEAM OPTICS
BEAM SHAPING
CONES
DIAGNOSTIC TECHNIQUES
IMAGE PROCESSING
IMAGE SCANNERS
ITERATIVE METHODS
MATHEMATICAL LOGIC
PROCESSING
SCATTERING
TOMOGRAPHY
440100 -- Radiation Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602 -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
655002* -- Medical Physics-- Radiation Source Calibration & Standardization
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
BACKSCATTERING
BEAM OPTICS
BEAM SHAPING
CONES
DIAGNOSTIC TECHNIQUES
IMAGE PROCESSING
IMAGE SCANNERS
ITERATIVE METHODS
MATHEMATICAL LOGIC
PROCESSING
SCATTERING
TOMOGRAPHY