Title :
Three-dimensional iterative reconstruction algorithms with attenuation and geometric point response correction
Author :
Zeng, G.L. ; Gullberg, G.T. ; Tsui, B.M.W. ; Terry, J.A.
Author_Institution :
Dept. of Radio., Utah Univ., Salt Lake City, UT, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
A three-dimensional iterative reconstruction algorithm which incorporates models of the geometric point response in the projector-backprojector is presented for parallel, fan, and cone beam geometries. The algorithms have been tested on an IBM 3090-600S supercomputer. The iterative EM reconstruction algorithm is 50 times longer with geometric response and photon attenuation models than without modeling these physical effects. An improvement in image quality in the reconstruction of projection data collected from a single-photon-emission computed tomography (SPECT) imaging system has been observed. Significant improvements in image quality are obtained when the geometric point response and attenuation are appropriately compensated. It is observed that resolution is significantly improved with attenuation correction alone. Using phantom experiments, it is observed that the modeling of the spatial system response imposes a smoothing without loss of resolution
Keywords :
computerised tomography; radioisotope scanning and imaging; 3D iterative reconstruction algorithms; IBM 3090-600S supercomputer; attenuation correction; cone beam geometry; fan beam geometry; geometric point response correction; image quality; iterative EM reconstruction algorithm; parallel beam geometry; projector-backprojector; single-photon-emission computed tomography; spatial system response; Attenuation; Geometry; Image quality; Iterative algorithms; Reconstruction algorithms; Single photon emission computed tomography; Solid modeling; Spatial resolution; Supercomputers; Testing;
Journal_Title :
Nuclear Science, IEEE Transactions on
